Agenda - 01-21-1992 - Laserfiche WebLink

Browse Search

61, Manville Application of Roof Insulation 0.1 General This specification is for use over approved lightweight insulating fills which can receive and adequately retain nails or other types of mechanical fasteners as may be recommended by the fill manufacturer. A list of approved fills is available from the Manville District Technical Services Department. Note: All information contained in the current Manville Industrial/ Commercial Roofing Systems Manual shall be considered part of this specification. 0.2 Materials per 100 sq. ft. of roof area over lightweight aggregate concrete: Felts: As nailable base— GlasBase'" or Ventsulationa ..................................... ............................... 1 layer As vapor retarder— GlasPlys Premier p or GlasPl yP IV ....................................... ............................... 1 layer Bitumen Per Felt Per Insulation Incline Type Ply (lbs.) Layer (lbs.) Up to 1" 170 deg Type II* 23 23 -33 1" to W 190dtglipeill 23 23 -33 Insulation: Fesco @pard, Fes -Core® UltraGard Gold' ", Tad WitraGard-Gold TM pere , or Fesco Foams ............................ .................. 100 sq. ft. per layer "Consult the Manville District Technical Services DepartrneM regarding projects in hot climates. 0.3 Application Base Felt: Apply one layer of Ventsulation or GlasBase starting at the low edge and lapping each course 2" over the preceding one. Nail the laps at 9" centers and down the longitudinal center of each felt nail two rows of nails with the rows spaced approximately 11 "apart and nails staggered on approximately 18" centers. Use nails or fasteners appropriate to the type of deck. Vapor Retarder (if required): Apply one 18" wide layer of GlasPly Premier or GlasPly IV, then continue with full 36" widths, lapping each course 2" over the preceding one. Install each felt so it shall be firmly and uniformly set, without voids, into the hot (within 25 °F of the EVT) asphalt applied just before the felt at a nominal uniform rate of 23 lbs. per square over the entire surface. All edges of the felts shall be turned up on, but not connected to, all vertical surfaces and extend beyond all roof edges. This coverage must be great enough to permit at least a 4" return over the top surface of the insulation. 20 Specification No. 502 For use over Lightweight Insulating Fills Employing Fesco® Fes -Core@ Fesco Foam@ or UltraGard Gold TM on Inclines up to 6" per Foot --With or Without a Vapor Retarder For Regions 1t, 2 & 3 Na Ins m Nailers (if required): Nailers, the same thickness as the insulation, are tD be installed in keeping with the requirements of the selected membrane specification. Wood nailing strips, edging and curbs should have been treated with preservatives which will not react with asphalt. Oil based preservatives such as creosote are not acceptable. See Section 11 of the Manville Industrial /Commercial Roofing Systems Manual for specific placement of nailing strips and orientation of roof assembly materials. Insulation: Firmly set the units of insulation, long joints continuous and short joints staggered, into a full width mopping of hot (within 25 °F of the EVT) asphalt applied at an approximate rate of 33 lbs. per square if applying high thermal insulation (Fes -Core, UltraGard Gold, Tapered UltraGard Gold or Fesco Foam) to a low thermal insulation (Fesco Board) in a two layer operation. If applying insulation to either a base felt or vapor retarder, use a rate of 23 lbs. per square. When applying a second layer of insulation, have both the long and short joints offset from the joints in the first layer. Before application of the roofing, the projecting felt at all vertical surfaces and edges shall be turned over and solidly mopped to the insulation. The insulation shall not be left exposed to the weather. No more insulation shall be applied than can be completely covered with the finished membrane on the same day.. . tContacl the M WI@ District Technical Services DeparGnen( for written approval in using this spedltcallm over ete ON selecled. 1�)