FE-1 (NLB). CSI 3-Part Specifications.

	BITUMINOUS FLASHINGS
	Specification FE-1 (NLB)

Base Flashing

For non load-bearing construction, using roof-to-wall expansion joint cover

General

This flashing specification is for use on non load-bearing construction, 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.

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).

Mop the surface of the roofing felts on the cant with hot Type III* or Type IV asphalt. Immediately place 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 membrane surface. The backer felt should extend to the top of the curb, and be nailed at 9" (229 mm) centers in both directions and at all laps. The backer felt should not be mopped to the curb. 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] long). Starting at the top of the curb, mop 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 base of cant) and lay it into place over the cant strip and up the wall. 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.

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

Expand-O-Flash Installation: Apply a 1/8" (3 mm) thick layer of JM Bestile Industrial Roof Cement to the top of the vertical face of the wood curb where the curb-form flange will be installed, and to the wall where the flat flange will be installed. Fasten the curb-form flange to the wood curb with the fasteners provided, at 8" (203 mm) o.c. maximum. Fasten the flat flange to the wall with suitable fasteners, at 8" (203 mm) o.c. maximum. The Expand-O-Flash bellows should have roughly a "quarter circle" shape once installed. The end joints between Expand-O-Flash sections are spliced in accordance with the application instructions included with the product.

Prefabricated inside and outside corners, as well as horizontal-to-vertical transitions, are available to complete the Expand-O-Flash installation. Refer to Section 12 on "Roofing Accessories" in the current JM Commercial/Industrial Roofing Systems Manual.

Metal Counterflashing: The metal counterflashing of the wall flange should be installed in accordance with the counterflashing 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-2081.