Specifications Building Division
Accessibility: Barrier Removal Improvement Plan
TIGARD;
REQUIREMENT: OREGON REVISED STATUTE (ORS) 447.241.
(1) Every project for renovation, alteration or modification to affected buildings and related
facilities shall be made to insure that the path of travel to the altered area and the restroom,
telephones and drinking fountains are readily accessible to individuals with disabilities unless
such alterations are disproportionate to the overall alterations in terms of cost and scope.
(2) Alterations made to the path of travel to an altered area may be deemed disproportionate to
the overall alteration when the cost exceeds twenty -five per -cent (25 %).
VALUATION: Total of all renovation, alteration or modification being done,
excluding painting and wallpapering: [1] $
MULTIPLIER (25% barrier removal requirement): x .25
TOTAL BUDGET FOR BARRIER REMOVAL: [2] $
•
ELEMENTS: In choosing which accessible elements to provide under this section, priority shall be given
to those elements that will provide the greatest access. Elements shall be provided in the
following order:
(a) Parking $
(b) An accessible entrance: $
(c) An accessible route to the altered area: $
(d) At least one accessible restroom for each sex or a single unisex
restroom: $
(e) Accessible telephones: $
(f) Accessible drinking fountains: and, $
(g) When possible, additional accessible elements such as storage and
alarms: $
TOTAL (shall equal line [2] of Valuation Computation): $
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For Fastener Selection Guide (Appendix A) and Insulation Lists please refer to PDF Specification.
PART 1 - GENERAL
1.01 Description
A. Furnish and install mechanically attached Stevens EP roofing system in accordance with drawings and
specifications approved by Stevens Roofing Systems (Stevens).
Special Conditions
1. This specification is intended for building roofs that have deck structures meeting guidelines herein and
have no abnormally severe or unknown environmental exposures, e.g. coastal winds or certain chemicals,
except as specifically authorized herein.
2. Applications that involve severe exposures (ASCE Ground Roughness Category D) require review by
Stevens Roofing Systems Technical Review Dept. before any specification is valid (Reference Table 2,
ASCE Exposure Classification Chart).
WARNING: Buildings operating with interior positive pressure at the deck require review by
Stevens Technical Review Dept. before any specification is valid.
B. Related work: Metal work other than Stevens Edge Metal Systems is not covered by Stevens for
Warranty. Metal work must be secured in a manner approved by Stevens and/or in accordance with
SMACNA guidelines to prevent damage from buckling, or wind exposure. All metal work that is part of the
waterproofing envelope must be sealed, structurally sound, and appropriately anchored to prevent leakage.
1.02 Quality assurance
A. Apply roofing system using a roofing applicator authorized by Stevens.
B. Stevens EP membrane is classified by Underwriters Laboratories as a Class A sheathing material for use in
construction of Class A roofing assemblies. See UL's Roofi ;:g Materials and Systems Directory for specific
assemblies. Meets all test requirements for FM Global (FMG) Class lA fire and wind resistance (Reference
current edition of FMG Approval Guide).
C. Inspection: Upon completion of the installation, an inspection will be performed by a representative of
Stevens to ascertain that the roofing membrane system has been installed according to Stevens approved
specifications and details. Upon approval of the project, a warranty shall be written.
D. Changes: Should there be deviations or changes from this specification without written approval from
Stevens, the project is not authorized for installation and is not eligible for Warranty coverage.
E. Stevens EP membrane is manufactured in an ISO - 9001:2000 facility.
1.03 Submittals
A. Minimum job file submittal information for warranty coverage consideration shall be an accurately
completed Request for Warranty form (www.StevensRFW.com) and the information discussed in paragraph
B following.
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B. Samples and data sheets of all materials not supplied or approved by Stevens shall be submitted to Stevens
for written approval prior to the start of installation. Authorized Applicators must submit a roof drawing
indicating which details will be employed in the project. These drawings shall be approved by Stevens prior
to the start of work. These must include: outline and size of the roof, location and type of penetrations,
perimeter and penetration flashing detail references, and a copy of any non -SR details to be used. Details
which do not conform to Stevens Standard SR Detail Drawings must be shown as to their anticipated
construction.
C. For a Limited Membrane Material Only Warranty, the Request for Membrane Warranty form is the only
submittal required.
1.04 Delivery and Storage
A. All materials provided by Stevens shall be delivered with appropriate packaging labels indicating warnings,
storage conditions, lot numbers, and usage instructions.
B. Materials shall be stored in their original undamaged packaging and storage conditions shall be maintained in
accordance with the manufacturer's requirements.
1.05 Precautions
A. Adhesives, solvents, and caulks as indicated are extremely flammable and/or toxic. Follow precautions
indicated on containers or packaging labels.
B. Surfaces to be bonded shall be dry, clean and free of debris. Suitable surfaces are usually considered to be
smooth: solid masonry, wood, and metal, plus insulation board fastened per the specific manufacturer's
recommendations for receiving adhered roofing membranes and accepted by Stevens for adhered
applications of Stevens EP membrane.
C. All fasteners should be installed with a depth- sensing screw gun to prevent overdriving or under driving.
The ASAP and PIF adapter tools are recommended for instaP:ng Stevens ASAP and Stevens PIF Fasteners.
D. Block off or shut down positive pressure building ventilation systems during application to prevent sheet
from billowing during application.
E. Consideration should be given in the project design to potential safety problems that can precipitate from the
smooth surface characteristic of the Stevens EP sheet. The membrane surface becomes slippery when wet.
If access to roof is required, walkway surfaces are highly recommended. In northern climates, sliding snow
could create a hazard below and adjacent to the perimeter if a retarding system is not installed on roofs with
slopes greater than 2 -in. per foot.
F. Job specification and retrofit preparation should always include provision to ensure positive drainage in all
areas. Good roofing practice does not permit uncontrolled, uncollected drainage over the edge of a roof.
G. All rooftop mechanical units are to have their condensation lines piped to drains, or off the roof.
H. Grease shall not be allowed to accumulate on the roof. If rooftop grease units do not receive continual
maintenance they are to have an approved grease containment system specified.
I. At the discretion of Stevens, excessive patching as a result of damage to the Stevens EP membrane, or
caused by faulty installation, may require total recover in those areas.
J. For buildings with canopies or large wall openings, e.g. hangar doors and truck entrances or docks, which are
subject to positive pressurization from air handling systems, :onsult Stevens for suitability of application and
possible design enhancement requirements.
1.06 Warranty
A. A Stevens representative shall inspect the installation for compliance with applicable Stevens specifications
upon completion of the roofing system.
B. Upon acceptance of the roofing system installation, a Stevens Standard or Total System Warranty will be
EP MA.10.04.2
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issued for a five (5), ten (10) or fifteen (15) year period that Lovers wind damage up to 60 mph. Refer to
Appendix E, Additional Requirements for Stevens 20 year Warranty Systems.
C. See General Warranty section of the Stevens CD -Rom for more information.
PART 2 - PRODUCTS
2.01 General
A. Stevens supplies a full line of accessory components to complete the construction of a Stevens membrane
roof. These parts shall be used when applicable in assemblies requiring a Total System Warranty. Materials
for other warranted systems are described or specified herein. Materials other than Stevens or detailed in
these specifications and/or addenda shall be submitted to the Stevens Technical Review Dept. for review and
approval prior to the start of work.
2.02 Membrane
A. Membrane for roof cover shall be .045 -in., .060 -in. or .080 -in. (Stevens EP -XL) nominal thickness overall,
scrim - reinforced, Ethylene Propylene -based sheet 76.5 -in. wide by appropriate length conforming to the
minimum physical properties in Table 1, Physical Properties Chart. (Factory fabricated 10 -ft. widths are
also available for .045 -in. and .060 -in. thick materials only. Contact Stevens Technical Review Dept. for
more information.) Stevens EP membrane is available in White, Light Slate Gray, Pewter, Buckskin, Desert
Brown, Terra Cotta, Patina, Dark Ivy Green and Neon Blue. Contact your Stevens Representative for color,
thickness options, minimums and lead times. Stevens EP Membranes meet the ASTM 6878 -03 specification
for TPO -based roofing material. Packaging to bear the UL label.
2.03 Related Materials
A. Insulation /underlayment/recover board: Stevens supplies a wide range of insulations,
underlayments and coverboards to satisfy a broad spectrum of design conditions. Only Stevens brand
insulation products will be eligible for Total System Warranty coverage: products other than Stevens will
incur a premium warranty fee. (Reference Appendix MA -B, Stevens Approved insulation List and Fastening
Rates for Mechanically Attached Systems).
1. Stevens ISO 2000: Closed -cell HCFC FREE "Green" polyisocyanurate foam core manufactured using
(HCFC) (ACUltra Hydrocarbon) blowing agent and integrally laminated to heavy non- asphaltic fiber -
reinforced felt facers; compressive strength - (20 psi) (25 psi). Available in flat stock and tapered panels.
(Reference Stevens Product Specification Data Sheets for additional information).
2. Stevens ISO 3000: Closed -cell HCFC FREE "Green" polyisocyanurate foam core manufactured using
(HCFC) (ACUltra Hydrocarbon) blowing agent and integrally laminated to heavy coated -glass facers;
compressive strength - (20 psi) (25 psi). (Reference Stevens Product Specification Data Sheets for
additional information).
3. Stevens ISO Recover Board: Closed -cell HCFC FREE "Green" polyisocyanurate foam core
manufactured using (HCFC) (ACUltra Hydrocarbond) blowing agent and integrally laminated to heavy
coated -glass facers; compressive strength - (20 psi) (Reference Stevens Product Specification Data Sheets
for additional information).
4. Stevens Extruded Polystyrene (XPS): Extruded polystyrene closed -cell foam panel with
continuous skin on face and back surface that meets ASTM C -578, Standard Specification for Rigid
Cellular Polystyrene Thermal Insulation. (Reference Stevens Product Specification Data Sheets for
additional information).
5. Stevens Expanded Polystyrene (EPS): ASTM C578 -04a expanded polystyrene thermal rigid
board insulation with a minimum density of 1.25 lbs. /cu.ft.(ft3). (Reference Stevens Product
Specification Data Sheets for additional information).
6. DensDeck® Roof Boards: (Reference Stevens Product Specification Data Sheets for additional
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information).
a. G -P Gypsum Corporation 1 /4 -in. DensDeck Roof Board, 1 /2 -in DensDeck Roof Board and 5/8-
in.Type X Roof Board. Nonstructural, glass mat faced gypsum panel with water - resistant core
available in 4- ft.x8 -ft. sizes and 4- ft.x4- ft.sizes
b. G -P Gypsum Corporation 1/4 -in. DensDeck Prime Roof Board, 112 -in. DensDeck Prime
Roof Board and 5 /8 -in. DensDeck Prime Roof Board (Type X). Glass mat faced gypsum
with non - asphaltic, highly filled proprietary heat -cured coating on one side available in 4-
ft.x8-ft. and 4- ft.x4 -ft. sizes.
c. G -P Gypsum Corporation 1/4 -in. DensDeck DuraGuard, 1 /2 -in. Densdeck Duraguard and
5 /8 -in. DensDeck Duraguard. Glass mat faced gypsum panel with blue low -perm,
durable, integrated- coating on one side and coated glass mat on the back available in 4-
ft.x8-ft. and 4- ft.x4 -ft. sizes.
B. Flashing: Flashing shall be .045 -in. thick membrane for walls and curbs regardless of roof cover sheet
thickness. Unsupported .055 -in. thick, Ethylene Propylene -based membrane shall be supplied for field -
fabricated vent stacks, pipes, drains and corners. Stevens EP -Clad Metal may be used for gravel stops or drip
edges.
C. Adhesive, Primers, Caulks and Sealant:
1. Stevens EP (TPO) Bonding Adhesive: Stevens EP (TPO) Bonding Adhesive is designed for
bonding all Stevens EP membranes to wood, metal, masonry, and approved roof insulation board
surfaces. Stevens EP Bonding Adhesive is not approved for use with other roofing membrane types or
Stevens EP- Fleece membrane.
2. Stevens All Purpose Sealant: Stevens All- Purpose Sealant is designed to be used as a water cutoff
mastic, sealant to top off pitch boxes, as an exterior grade caulk for metal work.
3. Stevens EP Cut - Edge Sealant: Stevens EP Cut -Edge Sealant is a solvent -based caulk developed to
seal exposed cut edges of reinforced membrane.
4. Stevens Insulation Adhesives: Stevens offers multiple insulation adhesive options.
a. Stevens Insulation Adhesive is a VOC -free, one -part, rising, moisture -cure foam that is
poured from 1 or 2.5 gallon cans on the substrate.
b. Stevens - Olybond 500 is a two part, polyurethane low rise foam that is applied in
ribbons with appropriate dispensing equipment.
c. Stevens - Olybond Classic is a two part, polyurethane low rise foam that is spray
applied to fully cover the substrate.
Stevens Insulation Adhesives are designed for bonding most insulation and recover boards to a wide range of
substrates and other insulation boards. Please consult the appropriate Product Specification Data Sheet for detailed
information.
5. Stevens EP Seam Cleaner: Stevens EP Seam Cleaner is a surface cleaner for use with Stevens EP
membranes that have become dirty or contaminated prior to heat welding.
D. Perimeter sheets:
1. Stevens published fastening rates and perimeter enhancer,,ent requirements are not necessarily consistent
with the requirements of local building codes, FMG or similar agencies. Consult said agencies for their
specific requirements when necessary or contact the Stevens Technical Review Dept.
2. Perimeter Sheet specification is defined as Stevens EP membrane with a minimum width of 38.25 in. and
a maximum width of 52.5 in.
3. For buildings less than 70-ft. high in wind zones within ASCE Ground Roughness
Categories A, B and C (Reference Table 2, ASCE Ground Roughness): two perimeter sheets
EP MA.10.04.4
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shall be installed at all exterior roof perimeters that are not bordered by a parapet wall or an adjoining
building a minimum of 24 -in. higher than roof level. Perimeter sheet requirement pertains to any
adjoining roof level 2 -ft. or greater above the main deck level. Reference special condition fastening
variations (reference 3.03) for guidelines addressing more severe exposures (ASCE Ground Roughness
category D) and buildings greater than 70 -ft. high.
E. Mechanical fasteners: Shall be supplied by Stevens.
1. Membrane:
a. Refer to Appendix A, Stevens Fastener Selection Guide and Appendix EP -C, Fastening
Requirements for Mechanically Attached EP Roofing Systems to select appropriate fastener /plate
combination and approved fastening rates. Also, Stevens Product Data Sheets can be found on the
Stevens Technical Manual CD -Rom.
b. For gypsum, cementitious woodfiber decks ( "Tectum ") and light -gauge metal panel roofs, fastener
pull tests must be submitted to Stevens Technical Review Dept. with the project Request for
Warranty form (RFW).
2. Insulation:
a. Refer to Appendix A, Stevens Fastener Selection Guide and Appendix MA -B, Stevens Approved
Insulation List and Fastening Rates for Mechanically Attached Systems, for approvals and fastening
requirements. Also, product data sheets can be found on the Stevens Technical Manual CD -Rom.
b. For gypsum, cementitious woodfiber decks ( "Tectum ") and light -gauge metal panel roofs, fastener
pull tests must be submitted to Stevens Technical Review Dept. with the project Request for
Warranty Form (RFW).
F. Termination bar: Stevens Termination Bar fastened 6 -in. o.c. is the only authorized product.
G. Stevens Edge Metal Systems: Stevens Edge Metal must be installed per standard SR details.
H. Roof walkways: When roof traffic is indicated (for example to service rooftop units), a walkway over the
membrane shall be made. Stevens EP Walkway Roll heat welded to the membrane is recommended.
I. Prefabricated Stevens EP Pipe Boots: Are provided as an alternative to .055 -in. unsupported
flashing for vent stacks and pipes 1 -in. to 6 -in. diameter.
J. Prefabricated Stevens EP Corners: Are provided as an alternative to .055 -in. unsupported flashing
for use at outside and inside corners.
K. Stevens EP Flashing Tape: 6 -in. wide x 70 -mils thick, packaged 100 -ft. rolls. This product is made
with unsupported membrane with a butyl tape backing (with a release paper) and is the preferred method for
stripping -in non- Stevens gravel stop and drip edge metal (noi for use on Stevens Clad Metal). Flashing Tape
eliminates the need for Stevens (TPO) Bonding Adhesive and Stevens All- Purpose Sealant when completing
edge flashings. Surfaces must be prepared with Stevens Tape Primer prior to Flashing Tape application.
PART 3 - EXECUTION
3.01 Substrate preparation
A. The applicator is responsible for ensuring the suitability of the substrate surface to accept the Stevens EP
membrane. In reroofing, test cuts shall be made by the roofing applicator to determine existing condition
and deck suitability. All noticeably damp, wet or deteriorated materials must be removed and replaced. In
all cases, prior to the start of work, the substrate shall be smooth and free of debris, sharp edges, and other
surface irregularities that will be detrimental to the installation. Any unevenness or joint gaps greater than
1 /4 -in. in the membrane substrate can cause inconsistent membrane welds and must be avoided. When such
conditions occur, fill with appropriate and properly secured insulation or material approved by Stevens
Technical Review Dept.
B. Steel deck, wood plank and lightweight cementitious decks: Shall be covered with an
approved insulation mechanically fastened or adhered to the deck with Stevens approved products
EP MA.10.04.5
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(Reference Appendix MA -B, Approved Insulation List & Fastening Rates for Mechanically Attached
Systems). Polystyrene boards may require a thermal barrier underlayment over steel decks. Consult
manufacturer and local building codes.
C. Concrete, plywood, or flat sheet -metal surface: Shall be dry, flat, clean, smooth, free of sharp
edges, and suitable for acceptance of Stevens EP membrane. Plywood must be exterior grade with an A or B
finish side up and with no joints gapped greater than 1/4 -inch. Consideration should be given to installing
slip plates over all gapped or uneven joints where membrane :,eams will cross to minimize welding
inconsistency. Thickness, structural grade, fastening, and fire resistance requirements should meet the
requirements and recommendations of applicable building codes and the APA and are the responsibility of
the owner and the installer. Concrete must be dry, fully cured, and prepared smooth with dust removed. The
membrane shall have a fastened expansion joint detail (as per Standard SR Detail Drawings) where deck
joints exceed 1 /4 -in. or when crossing a building expansion joint.
D. Reroofing over existing roof: The specifier and/or applicator shall determine the condition of the
existing roof. Significantly deteriorated decking must be repaired or replaced, as appropriate. Wet materials
(containing free moisture that would evaporate if exposed to atmosphere) must be found and replaced.
Existing surface shall be dry, reasonably smooth and even, blisters cut, and loose aggregate removed prior to
installation of approved insulation board.
E. Vapor retarder: Is not required for protection of Stevens Roofing System membrane. As a guideline,
the National Roofing Contractors Association states, "...vapor retarders should be considered for use when
both of two conditions are anticipated: (1) the outside mean, average January temperature is below 40°F
(4.4 °C), and (2) the expected winter, interior relative humidity is 45 percent or greater."
NOTE: In all high humidity situations consult Stevens Technical Review Dept. and the insulation
manufacturer for specific application requirements.
F. Nailers: Pressure preservative treated wooden nailers shal!.be installed at gravel stops or drip edges.
1. Reroofing: Use #2 or better wood treated for rot resistance. Creosote and asphaltic preservatives are
not acceptable.
2. New roofing: As specified by architect. A pressure preservative treated wood nailer is recommended.
Effective perimeter attachment must be achieved per details.
3. All construction: Nailer shall be anchored with a suitable fastener for the application having a
minimum withdrawal resistance of 100 -lbs., staggered 6 -in. o.c. within 8 -ft. of an outside corner and 12-
in. o.c. along other perimeter areas.
4. All construction: Nailer thickness shall be chosen to match the top surface of adjacent construction
±1 /4 -in. This permissible variation shall not contribute to ponding.
5. Nailers: Nailers around skylights, curbs, expansion joints, etc., are not required. Use of Stevens
fasteners and plates anchored to deck 12 -in. o.c. (except tall building applications, see 3.03.E) through
membrane and insulation is acceptable.
G. Existing flashings: Must be removed and completely cleaned off wherever new Stevens Roofing
System terminations and water stops are to be installed. Existing flashings may be left in place up to Stevens
termination areas when in good structural condition and solidly attached to the substrate.
H. New construction or reroof with complete tearoff of :flashings: The applicator is responsible for
determining the suitability of the substrate for the Stevens EP membrane. The substrate shall be smooth and
free of sharp edges and other surface irregularities that prevent the flashing membrane from being 100%
adhered.
3.02 Application procedures
NOTE: For insulation application and suitability, refer to Appendix MA -B, Stevens Approved
Insulation List & Fastening Rates.
A. Insulation or protection board:
EP MA.10.04.6
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1. Minimum thickness: Shall be approved in writing by Stevens. Since the insulation requirement for
thermal value will vary for each project, the thickness of the insulation must be calculated for the desired
results.
2. Compatibility: Certain insulation types, such as polystyrene, are not compatible with coal tar pitch.
Contact insulation manufacturer for recommendations. Certain polystyrene insulation boards are not
suitable for use directly under certain colors of Stevens EP membrane and require an overlayment
(Reference Appendix MA -B, Approved Insulation List and Fastening Rates for Mechanically Attached
Systems).
3. Manufacturers' instructions: In regard to attachment, compatibility, and spanning metal flutes, the
manufacturers' specifications shall determine the suitability for an application, subject to acceptance by
Stevens.
4. Precautions: Be careful when handling insulation to avoid damaging or rupturing the facer and/or
surface. All damaged areas must be cut out and replaced with structurally sound insulation, and properly
secured in place.
5. Attachment: Insulation boards must be secured sufficiently to conform to the substrate surface
geometry.
a. Mechanical attachment: All boards must be attached with FMG and Stevens - approved
insulation plates and appropriate fasteners. For Total System Warranty applications, insulation
plates and fasteners must be supplied by Stevens (Reference Appendix MA -B, Insulation List &
Fastening Rates for Mechanically Attached System).:
b. Adhered insulation with approved adhesive: As an alternative to mechanical attachment,
Stevens permits adhering insulation with Stevens - supplied insulation adhesive. Stevens Insulation
Adhesives are the only products eligible for Stevens warranty coverage. Insulation boards must be
secured sufficiently to conform to the substrate surface geometry.
c. Adhered insulation with asphalt: As an alternative to mechanical attachment, Stevens permits
adhering insulation with hot steep asphalt (ASTM D -312 Type III or IV). The specific application
must be approved in writing from the insulation board manufacturer and be approved by Stevens
Technical Review Dept. All temperature requirements and application procedures must be
followed. Insulation boards must be secured sufficiently to conform to the substrate surface
geometry.
6. Tapered insulation: Most tapered insulation systems taper down to a minimum 1 /2 -in. thickness only.
Therefore, a tapered edge strip of high- density fiberboard should be used to provide a smooth transition to
the flat areas.
7. Approved insulation boards shall be installed with the longest dimension perpendicular to the direction of
the membrane seams whenever possible and installed with end joints staggered. Boards will be butted as
closely as possible with no gaps over 1 /4 -in. and secured as specified in 3.02.A.5.
B. Membrane installation procedures:
(For metal roof retrofit applications, refer to Metal Roof Retrofit Specification).
1. Stevens perimeter sheets (Reference 2.03.D for perimeter sheet specifications): Two or
more perimeter sheets shall be installed at exposed perimeter areas, except when the building is less than
70 -ft. tall, and has a continuous 24 -in. or higher parapet and located within ASCE Ground Roughness
Categories A, B and C. Buildings located within ASCE Ground Roughness Category D may have
increased perimeter sheet requirements (Reference Table 2, ASCE Exposure Classification, and section
3.03). Stevens perimeter sheets shall be laid out in an approved pattern as shown in Standard Detail SR-
601 and SR -602. Appropriate Stevens fastener and plate combination (Reference 2.03.E and Appendix A,
Stevens Fastener Selection Guide) is installed along the edge of the membrane through the insulation
(through existing roof in reroofing), and into the roof deck. (Reference Stevens Technical Manual,
standard SR details and Appendix EP -C, Fastening Requirements for Mechanically Attached EP Roofing
EP MA.10.04.7
Systems). Adjacent rolls of Stevens EP membrane shall overlap the fastened edge of the installed
membrane by 4 1 /2 -in. (5 1 /2 -in. for Stevens plates larger than 2 -in.). (Reference Stevens Technical
Manual, standard detail SR -623 Fastening Requirements for Mechanically Attached EP Roofing
Systems.) At perimeters that are to receive a gravel stop or metal edging, Stevens EP membrane must be
brought over the outside edge and terminated 12 -in. o.c. unless otherwise stated in the appropriate detail.
2. Field sheets: Stevens EP and Stevens EP -XL membrane shall be unrolled on the area to be covered.
Appropriate Stevens fastener and plate combination (Reference section 2.03.E and Appendix A, Stevens
Fastener Selection Guide) should be installed along the leading edge of the membrane, as illustrated in
Standard SR Details, through the insulation (through existing roof in reroofing) and into the roof deck.
Adjacent rolls of Stevens EP membrane shall overlap the fastened edge of the installed membrane by 4
1 /2 -in. (5 1 /2 -in. for Stevens plates larger than 2 -in.). (Reference Stevens Technical Manual, standard
detail SR -623 Fastening Requirements for Mechanically Attached EP Roofing Systems.)
C. Lap splice: Membrane shall be overlapped and hot -air welded without any contaminants (adhesive, dirt,
debris, etc.) in the seam.
1. Hot - air welding: An automatic hot -air welder and hand -held welder which are functionally in top
condition are a necessity for Stevens applications. Small work and repairs can be completed efficiently
with the hand -held welders, however, hand -held welders are not a recommended means of field seaming.
2. The entire lap edge must be probed with an approved seam probing tool (i.e. Sears cotter pin
extractor) after it has cooled completely to verify seam consistency. Probing before the seam area has
cooled will damage the membrane. In addition, destructive tests should be performed daily on a 3 -in.
wide area of seam weld to verify sufficient peel strength. A properly welded seam will have membrane
delamination from scrim prior to weld failure. Destructive tests on welds should be conducted for the
first seam of the day, the first seam after the robot welder has been allowed to cool down, and after any
extreme changes in weather conditions. Cut edges shall be caulked by applying Stevens EP Cut -Edge
Sealant from a squeeze bottle.
3. T Seams.
a. Definition: The point where two perpendicular lap seams intersect is called a "T- seam" and if T-
seams are not properly welded, a seam void may result.
b. For .045 -in. and .060 -in. membrane, T -seams should be properly creased in at the step -off area,
using a hand roller. For T -seam locations that have not been welded properly, a patch is required.
Patches shall be a minimum of 4 -in. in diameter and can be either .045 -in. reinforced Stevens EP
membrane or .055 -in. unsupported membrane.
c. For Stevens EP -XL (.080 -in. thick membrane), a patch is required on all T -seam locations.
4. Stevens EP membrane, as with any material after exposure, will require cleaning prior to
seaming. The approved method for cleaning Stevens EP membrane prior to hot -air welding is as
follows:
a. Remove any visible dirt and debris with a clean rag and water. For heavily contaminated surfaces,
scrubbing with a detergent cleaner (i.e. Fantastik® or 409 ®) followed by a water rinse may be
necessary.
b. With a clean scrub pad saturated with Stevens EP Seam Cleaner, aggressively agitate the seaming
area. With a clean white rag, follow with a final one -swipe pass over the seaming area, without
redepositing any contaminants.
c. Allow Stevens EP Seam Cleaner to completely flash off (i.e. membrane should be completely dry).
d. Follow the standard hot -air welding procedures with an approximate 20% reduction in speed.
e. Final weld strength may not be achieved for several days.
D. Perimeter fastening: Wood nailers are required for pei; neter gravel stops or drip edges. Membrane
may be fastened at other terminations using Stevens Fasteners and Seam Plates.
1. Wooden nailers: See 3.01.F.
EP MA.10.04.8
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2. Base of parapet or curb: Membrane shall be mechanically fastened 12 -in. o.c. (except as described
in section 3.03.E) through insulation (and existing roof in reroofing) into deck. Fastening shall occur at
parapet wall, curbs, skylights, expansion joints and any other roof penetrations that exceed 24 -in. in any
dimension (Reference specific SR Detail Drawings).
E. Flashing: Perimeters, curbs, vents, expansion joints, drain'., and other details shall be flashed as shown in
standard SR Detail Drawings. Under no condition shall flashings cover weep holes or any form of through -
wall drainage.
1. Apply Stevens EP (TPO) Bonding Adhesive to both underside of flashing membrane and surface to which
it is to be bonded at a rate of approximately one gallon per 60 square feet of surface coverage (when
applied to two surfaces).
NOTE: Stevens EP (TPO) Bonding Adhesive shall not be applied to membrane surfaces that are
to be hot -air welded. Hot -air welding shall be used throughout the system where Stevens
Membrane overlaps itself.
2. Stevens EP (TPO) Bonding Adhesive shall be allowed to dry until tacky and until it does not string or
stick to a dry finger. Roll the flashing into the dry adhesive. Care must be taken to ensure that the
flashing does not bridge where there is any elevation or directional change. Completely roll in the
flashing membrane against the substrate using a hand roller, J- roller or similar device applying firm
pressure to the entire surface area to promote full contact.
3. All flashing shall be terminated as shown in standard SR Detail Drawings.
4. Stevens EP Metal flashing at perimeter shall be made and installed as per standard SR Detail Drawings.
5. Pipe flashings shall be installed in accordance with standard SR Detail Drawings. Remove existing
flashings and sleeves. Do not flash to lead.
6. Expansion joints shall be installed according to standard SR Detail Drawings.
7. Roof drains shall be installed according to standard SR Detail Drawings. In reroofing, old drains must be
cleaned or replaced as needed for clamping detail. All bolts must be properly secured to supply 100%
continuous compression of the clamping ring. Remove old leads and packings. Field seams shall not be
run through drains. Drain sleeves are not covered under warranty. Prefabricated sleeve insert with a
clamping ring and backflow seal are acceptable.
F. Metal work: Metal work other than Stevens Edge Metal Systems is not covered by Stevens Warranty.
1. Metal work shall be installed in a manner that prevents damage from buckling or wind.
2. All metal work must be sealed and waterproofed in an acceptable manner.
G. Overnight seal /temporary water stop: Shall be made by a sealant method approved by Stevens.
To protect the insulation from inclement weather at the end of a day's work, the membrane is extended
beyond the insulation and set into the approved overnight seal material. Roofing applicator shall coordinate
installation to ensure the system is made watertight at the end of each workday.
H. Roof walkway: When regular roof traffic is indicated (for example, to service rooftop units), Stevens EP
Walkway Roll is recommended over the membrane.
Installation:
For dirty and/or weathered membrane, start with #1 below. For clean fresh membrane, start with #4 below.
1. Stevens EP membrane must be clean and dry. Remove any visible dirt and debris with a clean rag and
water. For heavily contaminated surface, scrubbing with a detergent cleaner (i.e. Fantastik® or 409 ®)
followed by a water rinse may be necessary.
2. With a clean scrub pad saturated with Stevens EP Seam Cleaner, aggressively agitate the seaming area of
the roof membrane surface. With a clean white rag, follow with a final one -swipe pass without
redepositing any contaminants.
3. Allow Steven EP Seam Cleaner to completely flash off (i.e. membrane should be completely dry).
EP MA.10.04.9
4. Position Walkway Roll and cut to desired length. In circumstances where drainage around the walkway is
a concern, shorter walkway lengths spaced with a 2 -in. gap may be desired.
Whenever possible, walkway shall not cover seams. When installed adjacent to a seam, the walkway
should be kept a minimum of 2 -in. from the edge of the seam on the bottom sheet of the completed lap
and a minimum of 6 -in. from the edge of the seam when located on the top sheet of a completed lap.
When covering seams is unavoidable, the lap seam should be completed per Stevens Specifications and
thoroughly probed with any deficiencies repaired prior to walkway installation.
5. Weld perimeter of walkway to the membrane following standard welding procedures. Periodic 1- to 2 -in.
weep breaks in the weld are required on the low slope edge of the walkway to prevent the accumulation of
water under the walkway.
3.03 Fastening requirements
The following fastening rates apply to membrane with widths of 76.5 -in. or less and are applicable for
minimum 3 /4 -in. plank/plywood, 22 gauge steel (or heavier) and minimum 2500 psi compressive strength
structural concrete decks on buildings located within ASCE Ground Roughness Categories A, B and C
(Reference Table 2, ASCE Exposure Classification).
For fastening rates and approved fastener and plate combinations for deck types not listed here and for 10 -ft.
and 12 -ft. wide row spacings, refer to Appendix EP -C, Fastening Requirements for Mechanically Attached
EP Roofing Systems.
A. Buildings up to 70 -ft. high
1. Two perimeter sheets (minimum width 38.25 -in., maximum 52.5 -in.), fastened 12 -in. o.c., parallel to
entire perimeter ( "picture frame ").
2. Field sheets 18 -in. o.c.
B. Buildings over 70 -ft. to 110 -ft. high
1. Perimeter sheets fastened at 12 -in. o.c.*
2. Field sheets 18 -in. o.c.
C. Buildings over 110 -ft. to 200 -ft. high
1. Perimeter sheets fastened at 9 -in. o.c.*
2. Field sheets fastened 12 -in. o.c.
D. Buildings over 200 -ft. to 350 -ft. high
1. Perimeter sheets fastened at 6 -in. o.c.*
2. Field sheets fastened 6 -in. o.c.
* Perimeter area shall be defined as the smaller of:
• 0.1 times the building lesser plan dimension.
• 0.4 times the eaves height.
NOTE: All perimeter sheets are to be installed as shown in Stevens Detail Drawing SR -601 or SR-
602.
E. Tall building specification notes:
1. For buildings over 110 -ft. high fasten around all projections over 12 -in. in length or diameter at 9 -in. o.c.
2. Buildings that are sited on a high elevation relative to the surrounding area (Reference Table 2, ASCE
Ground Roughness Category D) are subject to different fastening patterns (Contact Stevens Technical
Review Dept.)
3. Changes in parapet wall heights, fire walls, adjacent roof areas, and roof geometry affect wind exposure.
Ensure that all such pertinent information is submitted to `':evens for review before committing to a
fastening specification.
EP MA.10.04.10
ave Z.Wir — 000
F. Restriction for coastal and abnormal wind uplift applications:
Typical considerations:
1. ASCE Exposure D.
2. Buildings over 350 -ft.
3. Buildings with positive pressure.
4. Canopy construction.
5. Hangar facilities and other buildings with side wall openings greater than 10% of a side wall area.
General design recommendation:
Any one of the above factors is a valid reason to consider increased perimeter and field fastening. Stevens
may require enhanced system design in the absence of significant compensating factors. Stevens should be
consulted before committing to a design and/or cost.
1. Special perimeter requirements may be set unless minimum 84 -in. high walls are continuous on at least
three sides.
2. Field fastening will normally be 12 -in. o.c. or tighter.
3. Air retarder system may be required for buildings with positive pressure or wall openings greater
than 10%.
TABLE 1- Physical Property Chart
Table 1 - Physical Properties - Stevens EP
Physical Property Test Method Typical Values 45 mil* Typical Values 60 mil* Typical Values 80 mil*
(1.14 mm) (1.52 mm) (2.03 mm)
Breaking Strength ASTM D -751 275Ibf(1.2 kN) 320lbf.(1.4 kN) 390 lbf. (1.7 kN)
Tear Strength ASTM D -751
Procedure B, 8 "x8 " sample) 135 lbf.(.60 kN) 110 Ibf.(.49 kN) 104 Ibf. (.46 kN)
EP MA.10.04.11
e 2 a 4 ._,,00
Dimensional Stability ASTM D -6878 (white: 6 hrs. ±0.3 ±0.3 ±0.2
(% change max.) @ 158 °F /70°C)
Hydrostatic Resistance ASTM D -751 (Method A) 400 psi (2.8 MPa) 425 psi (2.9 MPa) 510 psi (3.52 MPa)
Ozone Resistance ** ASTM D -1149 Pass Pass Pass
(70 hrs.@ 100 °F /37.8°C)
Weather Resistance Xenon Arc, ASTM D -6878 No cracks, loss of breaking No cracks, loss of breaking No cracks, loss of breaking
G -155; 5040 kJ /m' strength, or tear strength strength, or tear strength strength, or tear strength
0.35w /m @ 340nm
EMMAQUA (Concentrated Pass Pass Pass
Natural Sunlight) (ASTM G -90)
167 MJ /mz total UV radiant
exposure
Puncture Resistance FTM 101B (Method 2031) 330 lbf. (1.5 kN) 400 lbf. (1.8 kN) 500 lbf. (2.2 kN)
Water Vapor Transmission ASTM E -96 (Procedure B 0.035 Perms 0.035 Perms 0.035 Perms
Condition BW @ 72 °F/22.2°C)
Elongation ( %) Ultimate ** ASTM D -412 (Die C) 700% 700% 700%
Brittleness ASTM D -2137 @ - 49 °F / -45°C Pass Pass Pass
Water Absorption ASTM D -6878 D -471, ±3 ±3 ±3
(max. % weight change) ** (158 °F /70°C for 7 days)
Testing only one side section
Heat Aging ASTM D -6878 D -573 Break: 250 Ibf. (1.1 kN) Break: 290 lbf. (1.29 kN) Break: 350 Ibf. (1.56 kN)
(28 days @ 240 °F /115°C)
Solar Reflectance (initial) ASTM E -903 >70% >70% >70%
Thermal Emittance ASTM E -408 >0.93 >0.93 >0.93
*Thickness (nominal) per ASTM D -751 test method.
* *Test performed on non - reinforced Stevens EP membrane.
Table 2 - ASCE Exposure Classification
ASCE Exposure Classifications Defined
ASCE (American Society of Civil Engineers) has defined the roughness of the terrain into four "ground roughness" categories,
or "exposures ".
Exposure A This classification applies to large city centers with at least 50 percent of the buildings having a height in excess of 70
feet (21.3 m). Use of this exposure category shall be limited to those areas for which representative terrain prevails in
the upwind direction for a distance of at least one -half mile (0.8 km) or 10 times the height of the building or structure,
whichever is greater. Possible channeling effects or increased velocity pressures due to the building or structure being
located in the wake of adjacent buildings shall be taken into account.
Exposure B . Urban and suburban areas, wooded areas, or other terrain wv ;ih numerous closely spaced obstructions having the size
of a single - family dwelling or larger. Use of this exposure category shall be limited to those areas for which
representative terrain prevails in the upwind direction for a distance of at least 1,500 feet (460 m) or 10 times the
height of the building or structure, whichever is greater.
Exposure C Open terrain with scattered obstructions having heights generally less than 30 feet (9.1 m). This category includes
flat, open country and grasslands.
Exposure D Flat, unobstructed areas exposed to wind flowing over open water for a distance of at least one mile (1.61 km). This
exposure shall apply only to those buildings and other structures exposed to the wind coming from over the water.
Exposure D extends inland from the shoreline a distance of 1,500 feet (460 m) or 10 times the height of the building
or structure, whichever is greater.
EP MA.10.04.12