Johns Manville
DFE-1 (NLB). CSI 3-Part Specifications.
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BITUMINOUS FLASHINGS |
| Specification DFE-1 (NLB) |
For non load-bearing construction, using roof-to-wall expansion joint cover
General
This flashing specification is for use on non load-bearing construction, or where there is any potential for differential movement between the deck and the wall or parapet. The vertical wood curb should be fastened to the deck only.
Note: All general instructions contained in the current JM Commercial/Industrial Roofing Systems Manual shall be considered part of this specification.
Wall Preparation: Any previously installed metal cap or counterflashing must be lifted or removed, to permit application of the expansion joint cover.
Materials
Base Flashing and Expand-O-Flash: Approximately 100 lineal feet (30.5 lineal meters) of base flashing (8" [203 mm] high above the roof) and Expand-O-Flash can be installed with the following materials. Usage will vary depending on actual flashing height and field conditions.
| FesCant
Plus DynaFlex Type III* or Type IV Asphalt or MBR Flashing Cement or MBR Utility Cement Expand-O-Flash
Style CF-EJ |
100 lin. ft. (30.5 lineal meters) 110 sq. ft. (10.2 m2) 35 lbs. (15.9 kg) 4 - 5 gal. (15.1 - 18.9 liters) 9 gal. (34.1 liters) 100 lin. ft. (30.5 lineal
meters) |
Application
Base Flashing: The roofing membrane must extend to the top of the cant. The completed base flashing shall extend not less than 8" (203 mm) above the level of the roof, and shall extend onto the roof membrane a minimum of 4" (102 mm). Cut the DynaFlex into sections that can be easily handled and installed (6' - 8' [1.83 m - 2.44 m] long), and position upside down on the membrane, to allow the product to relax.
Hot Asphalt Application: Starting just above the point on the curb where the base flashing will terminate, mop the curb, the surface of the roofing felts on the cant, and out onto the roof membrane with hot Type III* or IV asphalt. Holding the upper corners of the DynaFlex, position its lower horizontal edge on the roof membrane (minimum 4" [102 mm] from base of cant) and lay it into place over the cant strip and up the curb. The sheet should be "worked-in" to ensure that it is firmly and uniformly bonded. The asphalt temperature shall be a minimum of 400�F (204�C) or at the EVT, whichever is higher, when the DynaFlex is set into it. This higher temperature maximizes the bonding of the base flashing. In cool or cold weather, the back of the DynaFlex sheet should also be mopped with the hot asphalt, and shorter lengths of DynaFlex should be used. PermaMop may not be used to install DynaFlex.
