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Specification 4GNC For use over wood or other nailable
Four Ply
decks on inclines of 'A" to 6" per foot
Mineral Surfaced (20.8 to 500 mm /m)
•
For Regions 1,2and3 75 )(74- Zi c
Fiber Glass Built -Up Roof 9
Materials per 100 sq, ft. of Roof Area
Nailable Deck Bitumen — Sheathing Paper:. , - . - '
Bitumen —', I. Wood board decks only., • 1 layer
. Sheathing Paper w . „ ., ,- _ .
•
•
, k : / \ (Il Required) • • . Fe lts::"" .• t .
GlasKap
GlasBase: . Mineral Sudaced :: GlasBase, Gl Plus, PermaPly 28 or Ventsulation Felt ,,,..1 ply
• GlasBase Plus, z Lap Cap Sheet , GlasPly Premier, PermaPly -R or GlasPly IV 2 plies
Ventsulation or ( - • Pernvdiy 28 I " End Laps . GlasKap, Mineral Surfaced Cap Sheet, ; 1 ply ` •
w _ _ Staggered
T 2' Lap 3' Apart (Min.) ' . • tl I Bitum (Interp '
TA
fi l ._ le' —.l - _ _ i __ Incline per foot ,Asphalt • . Nominal Weight
j # "4 l Up to 1': .170 °F, Type II, Flat ' 69 lbs.
• i l° 7-1 I '' I i - 1" to 3 ". ; 190 °F, Type III, Steep 69 lbs.
• ., • • 2' Lap " l••- 3" to 6" . Type Special Steep • - 220 °F T e IV S ial Stee '69 lbs. . e
' it ) 0 to 6" ' . PermaMop . '69 lbs.
. -� . in _ GlasPly Premier, ,,� I 6 End . t' A roximate installed wei ht: 175 - 260 lbs. .
1� GlasPly IV or Lap — pp g
1 . 4 9'� , i PermaPly -R
•
•
•
General nails staggered on approximately 18" (457 mm) centers. Use nails
This specification is for use over any type of approved structural or fasteners appropriate to the type of deck with 1" (25 mm) mini -
deck (without insulation) which can receive anc adequately retain mum diameter caps. For additional fastener information, refer to
,nails or other types of mechanical fasteners that may be recom- the Fastener Data in the "Roof Deck" section of the current Schuller
mended by the deck manufacturer. Examples of such decks are Commercial /Industrial Roofing Systems Manual. t
wood and plywood. This specification is not for use directly over
lightweight, insulating concrete decks. Using GlasPly Premier, PermaPly -R, or GlasPly IV, apply a piece • I
18" (457 mm) wide, then over that, a full width piece. The follow -
Design and installation of the deck and /or substrate ing felts are to be applied full width overlapping the preceding felts
must result in the roof draining freely and to outlets by 19" (483 mm) so that at least 2 plies of felt cover'.the base
• numerous enough and so located as to remove water felt /substrate at all locations. Install each felt so that it is firmly and
promptly and completely. Areas where water ponds uniformly set, without voids, into the hot bitumen (within ±25 °F
for more than 24 hours are unacceptable and are [±14 °C] of the EVT) applied just before the felt at a nominal rate of
not eligible to receive a Schuller Roofing Systems, 23 lbs. per square (1.1 kg.m') over the entire surface. Installation
Guarantee. over porous substrates such as roof insulation may require up to
Note: All general instructions contained in the current Schuller 33 lbs. per square (1.6 kg /m of hot bitumen.
Commercial /Industrial Roofing Systems Manual should be consid- Surfacing
ered part of this specification. Prior to application of GlasKap, cut the cap sheet into handleable
lengths (12' - 18' (3.66 m - 5.50 ml). Lay the material out on the
Flashings roof and allow it to relax and flatten. To accommodate a full width
Flashing details can be found in the "Bituminous Flashings" section sheet, apply a mopping of hot asphalt, approximately 20 °F above
• of the Schuller Commercial /Industrial Roofing Systems Manual. th EVT, at a nominal rate of 23 lbs. per square (1.1 kg /ml. (The
i Application higher temperature of asphalt maximizes the bonding of the cap
Over wood board decks, one ply of sheathing paper must be used sheet to the ply felts.) Then flop the cap sheet into the hot asphalt.
under the base felt and on top of the wood board deck. On subsequent courses, the cap sheet is positioned upside down,
directly over the sheet in the preceding course such that the side lap
Note: On roof decks with slopes up to 1" per foot (83.3 mm /m), area of the preceding sheet is exposed. Care should be taken to
the roofing felts may be installed either perpendicular or parallel to maintain 2" (51 mm) side laps and 6" (152 mm) end laps. Asphalt
the roof incline. On slopes over 1"poer foot (83.3 mm /m), refer to is applied in the same manner as before, making sure to also cover
Paragraph 6.11 of this section for special requirements. the 2" (51 mm) exposed side lap. Asphalt may also be applied to
the exposed "upside down" cap sheet, prior to "flopping" it into the
Using GlasBase, GlasBase Plus, Ventsulation, or PermaPly 28, hot asphalt. The cap sheet must be firmly and uniformly set, without
start with a 12" (305 mm) width (a specific base sheet may be a voids, into the hot asphalt with all edges and laps well sealed.
condition of Guarantee). The following base sheet courses are to
be applied full width, lapping the preceding felt 2" (51 mm) on the Asphalt should meet the requirements of ASTM D 312. The contrac-
side laps and 4" (102 mm) on the end laps. Nail the side laps 9" for must provide a Schuller confirmation number for asphalt on jobs
(229 mm) o.c. Down the longitudinal center of each felt, place Iwo which require a Guarantee. Check with a Schuller Technical Service
\)
rows of nails spaced approximately 11" (279 mm) apart, with the Specialist for special requirements in hot climates.
lea•Vr:a;; ;,