Plans o -
MILLER
February 13, 1998
CONSULTING
ENGINEERS
Mr. Sean Clay
Interstate Roofing
15065 SW 74 Avenue
Portland, Oregon 97224
RE: Roof Framing Inspection
11960 SW Pacific Hwy., Tigard, Oregon
MCE Project Nb. 970074
Dear Mr. Clay:
Per your request, Rob Aman of Miller Consulting Engineers, Inc. performed a roof framing
inspection for the subject project. The purpose of this inspection was to review any structural
deficiencies of the existing roof framing with the additional weight of a new re- roofing layer.
In a phone conversation between Mr. Clay and Mr. Aman, Mr. Clay stated that with the new
re -roof, the roof would consist of three re- roofing layers in addition to the original built -up roof.
Mr. Clay also informed Mr. Aman that the new re -roof weighs approximately 2 pounds per
square foot (psf).
Per the original building drawings, the roof framing was designed for a dead load of 22 psf and a
live load of 25 psf. The live load used for the original roof design meets the current building
code requirements. Calculations performed by this office show that with the third re -roof layer,
the total dead load for the roof (21.3 psf) does not exceed the 22 psf used for the original design
(See attached calculations). However, due to dead load restrictions, we recommend that any
additional re- roofing in the future will require removal of the existing re- roofing layers.
If you have any questions regarding these issues please call me.
Respectfully,
MILL CONSULTING ENGINEERS, INC.
� • ay nd T. Miller, P.E
President
RTM: raa
9570 SW Barbur Blvd., Suite 100 Portland, Oregon 97219 -5412 Phone (503) 246 -1250 Fax (503) 246 -1395
� I
American Consulting QII, Engineers Council
ROOF COVERING MATERIALS (TEVT) _ •ALS (TEVT) 1
` ROOFING SYSTEMS (TGFU) — Continued I Continued
. Membrane: "Duro -Last' PVC , mechanically fastened.
( ) Y ically fastened.
3. Deck: NC Incline: 1/4 c White Gray or Black roof coat
Existing Roof System: Class A, B or C covered with:
Insulation (Optional): bedded in the wet coating at
A. Any UL Classified polystyrene insulation (tapered or uniform
thickness) any thickness covered with 1 in. perlite or 1 in. wood fiber, 3. Incline: No limitation
Lydall 20 mil "Manniglas 1200" or Atlas Energy Products "FR10". Existing Roof System:
B. Celotex "Star AP" or "Hy -Tec", any thickness. A. Class A, B or C mineral or smooth surfaced asphalt felt roof
C. Atlas Energy Products "AC Foam I" or "AC Foam II, any thickness. system, covered with:
D. Owens - Corning "Roof Deck Boards ". B. Single -ply (modified bitumen) roof system, covered with:
E. Wood fiber. C. Class A, B or C asphalt organic felt or glass fiber mat shing
F. Perlite, 1 -1/2 to 3 in. incl. covered with:
Membrane: "Duro -Last" (PVC), mechanically fastened. Slip Sheet:
4. Deck: C -3/4 Incline: 1/4 A. One layer Lydall "Manniglas 1151" foil side down, mechanic.
Existing Roof System: Class A covered with: fastened.
Membrane: "Duro -Last" (PVC), mechanically fastened. B. Two layers Atlas Energy Products "FR10 ", mechanically fastener
5. Deck: C 15/32 Incline: 1/4 Membrane: "Duro -Last" (PVC), mechanically fastened.
Existing Roof System: Class A, B or C gravel surfaced. The gravel must Class A, B or C
be maintained at 400 lbs /sq. 1. Deck: C -15/32 Incline: 2
Separation Sheet: Type 30 or G2 (45 lb) base sheet, Lydall 10 mil Existing Roof System: Class A, B or C, Classification to be retain
"Manniglas" or underlayment boards consisting of Amoco Foam Products covered with:
"Amocor P14, PB4 or PB6," or min 1/2 in. thick wood fiber roof Membrane: "Duro -Last" (PVC), mechanically fastened. Existing roof Cla
insulation. fication remain the same.
Membrane: "Duro -Last" (PVC), mechanically fastened.
6. Deck: Existing Iodine: 3/4 DUTCHGLAS ROOFING SYSTEMS INC R8370 �
Existing Roof System: Class A, B or C BUR system, smooth surface
covered with: SUITE 10 23261 DEL LAGO DR, LAGUNA HILLS CA
Slip Sheet One layer Lydall "Manniglas 1151 foil side down or two 92653
layers Atlas Energy Products "FR10 ", mechanically fastened. ASPHALT FELT SYSTEMS WITH HOT ROOFING ASPHALT
Membrane: "Duro -Last" (PVC), mechanically fastened. Class A
7. Deck: C -15/32 Incline: No limitation 1. Deck: C -15/32 Incline: 1/2
Existing Roof System: Base Coat: Type G2 "SB -30 -G" hot mopped.
A. Class A, B or C mineral or smooth surfaced asphalt felt roofing Surfacing: Type G3 "CAP -80 -G" cap sheet, hot mopped.
system, covered with: 2. Deck: NC Incline: 2
B. Single -ply (modified bitumen) roof system, covered with: Insulation (Optional): Perlite, glass fiber or OCF glass fiber /ureth
C. Class A, B or C asphalt organic felt or glass fiber mat shingles, composite, 3 -3/4 in. max, mechanically fastened or hot mopped.
covered with: Base Coat (Optional): Type G2 "SBP- 30 -G ".
Slip Sheet Ply Sheet: 1 or 2 layers Type G2 "SBP- 30 -G ".
A. Two layers Lydall "Manniglas 1151" foil side down, mechanically Surfacing: Type G2 or G3 "CAP -80 -G" cap sheet, hot mopped.
fastened. 3. Deck: NC Incline: 3
B. Four layers Atlas Energy Products "FR10 ", mechanically fastened. Base Coat: Type G2 "SB -30 -G" mechanically fastened or hot moppet
Membrane: "Duro -Last" (PVC), mechanically fastened. Ply Sheet: 1 or 2 layers "SB- 11 -G ", hot mopped.
8. Deck: C -15/32 Incline: 1
Existing Roof System: Class A gravel surfaced asphalt felt roofing DWI DERMABIT WATERPROOFING INDUSTRIES CO LTD R13411 -
system. The gravel must be maintained at 400 lbs /sq. JUBAIL INDUSTRIAL CITY PO BOX 10308, JUBAIL
Insulation: Carpenter Insulation "Foamfold ", mechanically fastened. 31961 SAUDI ARABIA
•
Membrane: "Duro -Last" (PVC), mechanically fastened.
9. Deck: C -15/32 Incline: No limitation SiNGLE PLY MEMBRANE SYSTEMS
Existing Roof System: Class A, B or C roof (smooth or granular surfaced Class A - Ballasted
cap sheet, shingles or modified bitumen single ply), covered with 1/2 in. 1. Deck: 15/32 Incline: 2
(min) gypsum board, mechanically fastened. Membrane: "Dermabit 4170 APP Smooth ", "Dermabit 4170 APP Slat
Membrane: "Duro -Last" (PVC), mechanically fastened. "Dermabit 3050 APP Smooth ", "Elasphalt 4170 SBS Slated ", torch appl
10. Deck: NC Incline: 3 hot mopped or "Adesobit 2050", peel and stick.
Existing Roof System: Insulated or uninsulated ballasted single ply Insulation: Dow Chemical "Styrofoam RM, PD, SM, TG" or "Styrorib ", ;
membrane, ballast may be removed, covered with: min when the insulation is applied in more than one layer. Succes
Slip Sheet Atlas Energy Products "FR10 ", mechanically fastened or loose layers shall be installed without attachment to the preceding layer.
laid. Slip Sheet: (Optional) Fiberglass mat may be laid between the insula
Membrane: "Duro -Last" (PVC), mechanically fastened. and membrane.
11. Deck: C -15/32 Incline: 2 Scrim: (Optional) "Fabrene ", "International Paper D689" or "RI
Existing Roof System: Class A gravel surfaced asphalt felt roofing Polypropylene" 2 oz /sq yd (not Classified).
system. The gravel must be maintained at 400 lbs /sq. Surfacing: One of the following: A). 900 lb /sq min of crushed ston
Insulation: Polyfoam Packers "ThermoSafe -RB" insulation, mechanically river bottom stone which is free from dirt and graded to a typical siz
fastened. 3/4 in. with a min of 1/2 in. for crushed stone and 3/4 in. to 1 -3 /i
Membrane: "Duro -Last" (PVC), mechanically fastened. for river bottom stone. B). Concrete blocks weighing not less thar
Class B - lb /sq ft and spread not more than 1/8 in. apart.
1. Deck: C -15/32 Incline: 1 2. Deck: NC Incline: 1/2
Existing Roof System: Class B BUR system smooth surfaced covered Ply Sheet: One layer of G1 or G2 glass fiber ply sheet, mopped in p
with: or "Adesobit 2050 ", peel and stick membrane.
Slip Sheet Membrane: "Adesobit 2050", peel and stick membrane.
A Type 30 or G2 (45 lb) base sheet. Surfacing: Gravel.
B. One layer Lydall 10 mil "Manniglas 1200". Class A - Fully Adhered
L C. One layer Atlas Energy Products "FR10 ", mechanically fastened. 1. Deck: NC Incline: 1/2
D. AMOCO Foam Products "Amnocor P14, PB4, PB6 ". Insulation: Wood fiber, glass fiber, perlite, "Thermax Hy -Tec", or "Apt
E. Carpenter Insulation "Foamfold ". Pyrox White Line" 2 in. max, hot mopped or mechanically fastene.
F. Min 1/2 in. wood fiber roof insulation. place.
G. 3 mil polyethylene film. Base Sheet: Type 15, 30 organic, G1 or G2, mechanically fastened or
Membrane: "Duro -Last" (PVC), mechanically fastened. mopped in place.
2. Deck: C -15/32 Incline: No limitations Membrane: "Dermabit 3050 APP Smooth ", "Elasphalt 4170 SBS Sla
Base Sheet One layer Type G2 Owens- Corning base sheet, mechanically torch applied, hot mopped or "Adesobit 2050 ", peel and stick.
fastened to deck. Surfacing: Karnak No. 97 Fibrated Aluminum Roof Coating nominal 1-
Cap Sheet One layer Type G3 GAF Mineral Surfaced Cap Sheet, hot gal /sq.
mopped. 2. Deck: NC Incline: 1/4
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