DFE-2. CSI 3-Part Specifications.

	BITUMINOUS FLASHINGS
	Specification DFE-2

Base Flashing

For load-bearing masonry parapet construction with no nailing facilities

General

This flashing specification is for use on masonry walls and parapets where no nailing facilities exist, and where the roof deck is supported by the wall or parapet.

Note: All general instructions contained in the current JM Commercial/Industrial Roofing Systems Manual shall be considered part of this specification.

Wall Preparation: Apply JM Concrete Primer to the masonry wall, to the full extent of the proposed flashing, and allow to dry thoroughly.

Materials

Approximately 100 square feet (9.3 m²) of flashing can be installed with the following materials:

* If the surface to which the MBR Flashing Cement is applied is unusually rough, additional cement may be required.

Application

Flashing Full Height of Parapet and Over the Top:^† The roofing membrane must extend to the top of the cant. The completed base flashing shall extend not less than 8" (203 mm) nor more than 24" (610 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.

Starting approximately 2" (51 mm) from the outer edge of the parapet, spread a layer of MBR Flashing Cement approximately 1/8" (3 mm) thick on the top of the parapet, down the inside face, across the cant, and out onto the roof membrane. 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 and over the top of the parapet. The sheet should be "worked-in" to ensure that it

is firmly and uniformly bonded. The vertical joints are to be lapped a minimum of 4" (102 mm) and well sealed. Cover the upper termination of the DynaFlex with a 1/8" (3 mm) thick layer of MBR Flashing Cement (minimum 4" [102 mm] wide), or a 4" (102 mm) wide strip of fiber glass mesh or ply felt embedded in and trowelled over with a layer of MBR Utility Cement. It is recommended that the vertical laps be similarly treated.

Surfacing: DynaFlex requires no additional surfacing.

For an identical copy of this specification, ask for RS-4219.