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Commercial/Industrial Roofing Systems
Johns Manville Built-Up Roofing Specifications
Specification 4GNC
Four Ply Mineral Surfaced Fiber Glass Built-Up Roof.
For use over wood or other callable decks on inclines Deck
of up to 6"per foot(500 mm/m). � *
Materials per 109 sq.ft.(93 m°)of Root Area r°nrmmml
aaxo good
■Glmem°Pen. sa turd top Shoo•
Wood boarddddecks only 1 layer v,°its°` s
GI�asBase Plus,PennaP(y 28 or Ventsulation Felt 1 ply o _ f r
GlasPly Premier or GlasPly IV 2 plies 1 I. "".
GlasKap 1 Ply
P 1
Asphalt(lnterply):Trumbull"or other JM Approved Asphalt + z
Incline per foot Asphalt Nominal Weight 118,,Up to 1"(83 mm/m) 170°F(77°Cl,Type II,Rat 69 lbs.(31 kgs.) 1, rilasPry rremmer 4.sm l"to 3"(83 to250mm/m) 190T(88°C), orG1asPNN urn°--r—
Type III,Steep 69 lbs.(31 kgs)
3"to 6°(250 to 500 mm/m) 220°F(104°C),Type IV, 96NC
Spacial Steep 69 lbs.(31 kgs.)
Up to 6'(500 mmhn) PermaMop 69 lbs.(31 kgs.)
Approximate installed weight 175-260 lbs.(79-118 kgs.). Using GlasPly Premier or GlasPly IV,apply a piece 18"(457 mm)
•• General wide,then over that,a full width piece.The following felts are to be
applied full width overlapping the preceding felts by 19"(483 mm)so
This specification is for use over any type of approved structural that at least 2 plies of felt cover the base tellsubstrate at all loce-
deck(without insulation)which can receive and adequately retain tons.Install each felt so that it is firmly and uniformly set,without
nails or other types of mechanical fasteners that may be recent- voids,into the hat asphalt(within±25°F[±14°C[of the EVT)applied
mended by the deck manufacturer.Examples of such decks are just before the felt at a nominal rate of 23 lbs.per square 11.1 kg/m')
wood and plywood.This specification is not for use directly over over the entire surface.
lightweight insulating concrete decks.
Design and installation of the deck eodfor substrate must result in Su facing
the roof draining freely and to outlets mmerons enough and so Prior to application of GlasKep,cut the cap sheet into handleable
located as to remove water promptly and completely.Areas where lengths(12'-18'[3.66 m-5.50 ml).Lay the material out on the roof
water ponds for more than 29 hours are unacceptable and are not and allow it to relax and flatten.To accommodate a full width sheet.
eligible to receive a JM Roofing Systems Guarantee. apply a mopping of hot asphalt,approximately 20°F(11°C(above the
Note:All general instructions contained in the currentJM EVf,at a nominal rate dB 1hs per square(1.1 kg1m).(The higher
Commercial/Industrial Roofing Systems Manual should be consid- temperature of asphalt maximizes the bonding of the cap sheet to
ered part of this specification the ply felts.)Then flop the cap sheet into the hot asphalt.On subse-
quent courses,the cap sheet is positioned upside down,directly
fleshings over the sheet in the preceding course such that the side lap area
Flashing details can be found in the'Bituminous fleshings"section of the preceding sheet is exposed.Care should be taken to maintain
of the JM Commerciallledustrial Roofing Systems Manual. 2 (51 mm)side laps and 4"(102 mm)end laps.Asphalt is applied in
the same manner as before,making sure to also cover the 2"(51 mm)
Application exposed side lap.Asphalt may also be applied to the exposed
"upside down"cap sheet,prior to'flopping"it into the hot asphalt
Over wood board decks,one ply of sheathing paper must be used The cap sheet must be firmly and uniformly set,without voids,into
under the base felt and on top of the wood board deck the hot asphalt with all edges and laps well sealed.
Note:On rout decks with slopes up to 1"per foot(83.3 mm/m),the
roofing felts may be installed either porpundicular or paroiol to the Asphalt
roof incline.On slopes over 1"per foot(83.3 mm/m),refer to Asphalt should meet the requirements of ASTM 0 312
Paragraph 6.11 of this section for special requirements. JM Guarantees require the use of Trumbull asphalt or another JM
Using GlesBase Plus,PermaPly 28 or Ventsulation,start with a Approved Asphalt
12"1305 mm)width(a specific base sheet maybe a condition of Check with a JM Technical Service Specialist for special asphalt
Guarantee).The following base sheet courses are to be applied full
width,lapping the preceding felt 2"151 mm)on the side laps and requirements in hat climates.
4"(102 mm)on the end laps.Nail the side laps 9"(229 nun)o.c.
Down the longitudinal center of each felt,place two rows of nails
spaced approximately 11-1279 mm)apart,with the nails staggered
on approximately 18'(457 mm)centers.Use nails or fasteners
appropriate to the type of deck with 1"425 mm)minimum diameter
caps.For additional fastener information,refer to the Fastener Date
in the°Roof Deck°section of the current JM Commercia&lndusniel Refer to the Material Safety Data Sheet and Product Label prior to
Roofing Systems Manual. using this product.
•Tn rrind 13 a registered trademark of aaa m Coming.
RS-2049 a-09(Nerd