FE-3. CSI 3-Part Specifications.

	BITUMINOUS FLASHINGS
	Specification FE-3

Base Flashing

For load-bearing wood parapet construction less than 24" (610 mm) above the roof membrane

General

This flashing specification is for use on wood surfaced walls or parapets which are less than 24" (610 mm) high above the roof, 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: Any previously installed metal coping or counter-flashing must be lifted or removed, to permit application of the base flashing.

Materials

Base Flashing: Approximately 100 lineal feet (30.5 lineal meters) of base flashing (8" [203 mm] high above the roof) can be installed with the following materials. Usage will vary depending on actual flashing height and field conditions.

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) 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).

Mop the surface of the roofing felts on the cant with hot Type III* or Type IV asphalt. Immediately set the backer felt into the hot asphalt, smoothing the felt to set it firmly into the asphalt. The bottom edge of the backer felt should terminate at the bottom edge (base) of the cant. Do not extend the backer felt onto the horizontal surface of the membrane. The backer felt should extend up and over the top of the parapet, and be nailed at 9" (229 mm) centers in both directions, and at all laps. The backer felt should not be mopped to the wall. Laps in the backer felt should be a minimum of 2" (51 mm).

Cut the GlasTite Flexible into sections that can be easily handled and installed (6' - 8' [1.83 m - 2.44 m]). Starting just beyond the top edge of the backer felt, mop the parapet, the surface of the backer felt, and out onto the roof membrane with hot Type III* or IV asphalt. Holding the upper corners of the GlasTite Flexible, position its lower horizontal edge on the roof membrane (minimum 4" (102 mm) from the base of the 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.

In cool or cold weather, the back of the flashing sheet should also be mopped with the hot asphalt, and shorter lengths of GlasTite Flexible should be used. Laps in the GlasTite Flexible should be a minimum of 3" (76 mm) and be well sealed. Laps in the backer felt and the GlasTite Flexible shall be offset a minimum of 6" (152 mm) from each other.

Mechanically fasten the base flashing on 6" (152 mm) centers along the top edge. Fasteners must have 1" (25 mm) minimum integral caps, or be driven through 1" (25 mm) minimum rigid metal discs.

The vertical laps of the flashing may be stripped in with a 4" (102 mm) wide strip of fiber glass mesh or ply felt embedded in and trowelled over with a 1/8" (3 mm) thick layer of Bestile Industrial Roof Cement.

Metal Coping: Metal coping should be installed in accordance with the coping manufacturer’s specifications and details, or in accordance with SMACNA procedures.

Surfacing

GlasTite Flexible must be coated with a final surfacing. This surfacing can be any approved JM roof coating, except hot asphalt.

For an identical copy of this specification, ask for RS-2083.