DFE-4. CSI 3-Part Specifications. Large file (>500kB).

Roof Edge Details

Roof edges and gravel stops

General

The constructions shown are for use at the perimeter of the roof when no parapet exists.

This type of detail covers the junction between roof and exterior walls, provides a decorative fascia for the building, and (when required) acts as a gravel stop.

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

Gravel Stop/Gutter

Prior to the application of any metal edging, the membrane is carried up and secured to the wood nailer, with nails having a 1" (25 mm) head or disc, at 6" (152 mm) o.c. Where desired, a felt envelope can wrap the end of the membrane, to prevent asphalt drippage down the face of the building. Wood nailers must extend horizontally beyond the metal flange of the edge piece. Nailers must be pressure treated with a salt preservative. Treatment of the nailers with creosote or asphaltic preservatives is not acceptable. The wood nailers must be solidly anchored to the structure.

Light gauge metals shall be used, such as copper, hot galvanized steel, or aluminum. Refer to SMACNA details for recommendations on metal gauge, size, and cleat requirements. The metal should be thoroughly cleaned to remove oil or other contaminants, and primed on both sides with JM Metal Primer, before applying the MBR Flashing Cement, MBR Utility Cement or hot asphalt.

Set the metal sections into a 1/8" (3 mm) thick bed of MBR Flashing Cement or MBR Utility Cement, and fasten 3" (76 mm) o.c. on the horizontal flange, staggering the fasteners. The vertical face of the metal can be held either by a continuous cleat or face fastened. Strip in the metal edge with a minimum 8" (203 mm) wide piece of the modified bitumen membrane material, set in MBR Flashing Cement, MBR Utility Cement or hot asphalt.

PermaMop may not be used to install the modified bitumen material. As an alternate, the primed metal sections are placed over the base or intermediate plies of the roofing membrane, in a bed of MBR Utility Cement. The metal is then stripped in with an 8" (203 mm) wide piece of GlasPly Premier or GlasPly IV set in hot asphalt. The modified bitumen membrane material is then applied over the ply felt in hot asphalt. PermaMop may not be used to install the modified bitumen material.

 

For an identical copy of this specification, ask for RS-4222.