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Manville BUR Systems <br />Drainage: Design and installation of the deck and /or <br />roof substrate must result in the roof draining freely to <br />outlets numerous enough and so located as to remove <br />water promptly and completely. Areas where water <br />ponds for more than 24 hours are unacceptable and will <br />not be guaranteed. <br />Asphalt <br />Apply asphalt at EV r If EVT is not known, use table below as <br />a guide. <br />Asphalt Type Heating Application <br />150 deg., Type I, Dead Level 425° 275 -350° <br />170 deg., Type II, Flat 4500 325 -4000 <br />190 deg., Type 111, Steep 500° 350 -475' <br />220 deg., Type IV, Special Steep 500° 375 -475" <br />Roof Incline Limitations —The type of asphalt used for inter - <br />ply moppings and surfacing varies with the roof incline and <br />the surfacing treatment. As the incline increases the softening <br />point of the asphalt also increases. Listed below are the types <br />of asphalt recommended for use with smooth, gravel, and <br />mineral surfaced roof systems. <br />Smooth Surfaced <br />Roof Slope Limit. <br />Asphalt Type <br />Up to 1 "/ft <br />170 deg., Type 11 <br />1" to 3 " /ft <br />190 deg., Type 111 <br />3" to 6 "/ft <br />220 deg., T pe IV <br />Gravel Surfaced <br />Up to 1 /2 " /ft <br />170 deg., Type II <br />'/2" to 3" /ft <br />190 d ., T pe III <br />Mineral Surfaced <br />Up to %W /ft 170 deg., Type II <br />1/2" to W/ft 190 deg., Type III <br />3" to 6 "/ft 220 deg., Type IV <br />Roofing asphalt is to be installed at a nominal rate of 23 lbs. per <br />ply, per square. When installed over insulation, more or less <br />than 23 pounds per square of roofing bitumen may be needed <br />due to absorptivity of the insulation. <br />Surfacing <br />Smooth Surfaced Roofs. Available surfacings and <br />typical coverage. <br />Type and quantity of roof surfacing is dictated by any or all of the <br />following: the specification selected, incline of the roof structure, <br />and /or Underwriters laboratories Classification required. <br />These surfacings are available: <br />Topgard Type -13 Fibrated ............................................. ..... 2 -3 gals_ <br />Topgard Type C (Incline must be 1/2w or greater) ..................1 gal. <br />TopgardType F ............................................ ..................... . . . ..2 gals. <br />Asphalt (Type consistent with incline) ........................15 lbs. max. <br />Fibrated Aluminum Roof Coating .......... ..............................2 gals. <br />For immediate application, apply over Topgard B which has <br />been allowed to dry. Otherwise apply over asphalt surfacing <br />which has weathered over one summer. <br />07500 /MAN <br />BuyLine 5318 <br />Application Procedures <br />Gravel or Slag Surfaced Roofs. Surfacing material meeting <br />ASTM Specification D- 1863 -83 is acceptable, using 400 lbs. of <br />gavel or 300 lbs. of slag, applied in a flood coat of approximately <br />60 Ibs_ of hot asphalt per square_ <br />Wood Nailers— Non - Nailable Decks: <br />When wood milers are installed to non- nailable deck, all felts <br />are to be run parallel to the direction of the roof incline. locate <br />one fastener in the leading edge of the ply or cap sheet felt at <br />each nailing strip, being sure each nail is covered by succeeding <br />plies_ All nails or other fastener; must be driven through caps <br />unless the fastener has an integral flat cap no less than V across. <br />Mechanical Fasteners — Steeper Nailable Decks: <br />The type of finished roof surfacing and the deck incline govern <br />the requirement of additional mechanical fastening of roofing <br />systems over nailable substrates. <br />The limitations are: <br />Smooth surface ...... ............................ .............................2" or over <br />Gravel surface ............................................... ................... 1 "or over <br />Mineralcap ............................................ ............................1" or over <br />Felts used in smooth surfaced roofs, on inclines up to 2" per <br />foot, gravel surfaced and mineral cap roofs, on inclines up to <br />1" per foot, may be installed horizontally, or perpendicular <br />to the roof incline. <br />Felts used in smooth surfaced roofs on inclines over 2" per foot, <br />gravel surfaced roofs, and mineral surfaced roofs on inclines over <br />1" per foot must be installed parallel to the roof incline. Finishing <br />felts and mineral surfaced cap sheets are to be "back nailed" <br />akng the leading edge in rows spaced as shown in the following <br />table depending on the roof incline and surfacing treatment, <br />being sure each fastener is covered by succeeding plies. <br />Surfacing <br />Roof Incline <br />Spacing of <br />Fastener Rows <br />Smooth <br />2" -3" <br />20' OC <br />3 "-4" <br />10' OC <br />4 "-6" <br />4' OC <br />Gravel <br />1" -2" <br />20' OC <br />10' OC <br />Mineral Cap <br />1 " -2" <br />20' OC <br />2" -3" <br />10' OC <br />3 " -6" <br />4' OC <br />All nails or other fasteners must be driven through caps, unless -� <br />the fastener has an integral flat cap no less than 1" across_ <br />