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

	BITUMINOUS FLASHINGS
	Specification FE-1 (LB)

For load-bearing masonry parapet construction with nailing facilities

General

This flashing specification is for use on masonry parapets that can accept and retain the required mechanical fasteners, and where the roof deck is supported by the 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 cap or counterflashing must be lifted or removed, to permit application of the base flashing.   Apply JM Concrete Primer to the masonry wall, to the full height of the proposed base flashing and counterflashing, and allow the primer to dry thoroughly.

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.

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).

Starting just below the point on the parapet where the base flashing will terminate, mop the parapet and 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. 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 just above the top edge of the backer felt, mop the wall, 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 the 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 its 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.

Note: For 5 year or 10 year penal sum guarantees, the backer felt is not required.

Metal Counterflashing: Metal counterflashings, when properly installed, are the preferred method of completing this flashing detail. They should be installed in accordance with the metal manufacturer’s specifications and details, or in accordance with SMACNA procedures, and should overlap the base flashing by a minimum of 4" (102 mm).

Bestile Industrial Roof Cement Counterflashing: If metal counterflashings are not used, the base flashing must be finished 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, bringing the cement to a feather edge. This procedure should also be used if the application of metal counterflashings will be delayed.

Surfacing

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

* Consult a JM Technical Services Specialist regarding the use of Type III asphalt in hot climates.

For an identical copy of this specification, ask for RS-2081.