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7550 Guide Specifications:
Modified Bitumen/Cap Sheet Roof System
2. Starting at the low edge of the roof, apply [one 18 inch (457 mm) width of [GlasPly Premier] [GlasPly IV] felt, then over that a full 36 inch (914
mm) wide [GlasPly Premier] [GlasPly IV] felt set in hot asphalt. Following felts are to be applied full width, overlapping the preceding felt by 19
inches (483 mm) so that at least 2 plies cover the [insulation] [deck] [base sheet] in all locations.] [one 12 inch (305 mm) wide, then over that
one 24 inches (610 mm) wide, then over that one, full 36 inch (914 mm) wide [GlasPly Premier] [GlasPly IV]. Following felts are to be applied
full width, overlapping the preceding felt by 24 2/3 inches (627 mm), so that at least 3 plies of felt cover the substrate at all locations.] [A full 36
inch (914 mm) wide [GlasPly Premier] [GlasPly IV] set in hot asphalt. Following felts are to be applied full width, overlapping the preceding felt
by 3 inches (76 mm) so that at least 1 ply covers the [insulation] [base sheet] [concrete deck] in all locations.] Install each felt so that it shall be
firmly and uniformly set, without voids, into the hot asphalt (within 25 degrees F [14 degrees C] of the EVT) applied just before the felt at a
nominal uniform rate of 23 lbs. per square (1.12 kg/m2) over the entire surface.
3. Equiviscous Temperature at Point of Application: No more than 25 degrees F (14 degrees C) from asphalt rating indicated on asphalt
container label.
4. Apply [DynaKap FR] [DynaGlas FR] [DynaLastic 180 FR] [DynaLastic 250 FR] [DynaMax] over [one] [two] [three] layers of roofing plies.
Starting at the low edge of the roof, apply one full width sheet of the modified bitumen [DynaKap FR] [DynaGlas FR] [DynaLastic 180 FR]
being sure to maintain 4 inch (102 mm) side and end laps over preceding sheets [6 inch (152 mm) end laps for DynaLastic 180 FR.] The
sheet must be firmly and uniformly set, without voids into the hot asphalt.
5. Apply felts smooth, free from air pockets, wrinkles, fishmouths, lap joints, or tears.
6. Extend plies of membrane felts up cant strips.
7. Install DynaTred traffic pads by setting in hot asphalt at locations marked on plans.
8. Broadcast granules into the hot asphalt at edges of SBS cap sheet after cap has been applied in order to maintain a neat appearance.
K. Flashings and Accessories
1. Apply JM granular surfaced SBS flexible base flashings, DynaFlex to seal membrane to vertical elements. Flashing
specifications as listed in the current JM manual.
2. Install one roof vent per [1000] [1500] [2000] sq ft ([93] [139] [186] sq m) or part thereof, of roof area.
3. Install prefabricated roof expansion joint covers in accordance with manufacturer’s instructions.
4. Coordinate installation of roof [drains] [sumps] [__________] and related flashings.
5. Mop in and seal flashings and flanges of items penetrating membrane with two plies of felt.
L. Field Quality Control
1. Field inspection [and testing] will be performed under provisions of Section [01400.] [01410.]
2. Correct identified defects or irregularities.
M. Manufacturer’s Field Services
1. Provide manufacturer’s field services under provisions of Section [01600.] [01650.]
2. Request site attendance of roofing [and insulation] materials manufacturers during installation of the work.
N. Cleaning
1. Remove bituminous markings from finished surfaces.
2. In areas where finished surfaces are soiled by asphalt or any other source of soiling caused by work of this section, consult
manufacturer of surfaces for cleaning advice and conform to their [documented] instructions.
3. Repair or replace defaced or disfigured finishes caused by work of this section.
