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

Roof Edge Details

Roof edges and gravel stops

General

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

Roof Edge

Prior to the application of any metal edging, the membrane is carried up and secured to the wood cant, with nails having a 1" (25 mm) head or disc, at 4" (102 mm) o.c. Wood nailers and cants must be pressure treated with a salt preservative. Treatment with creosote or asphaltic preservatives is not acceptable. The wood nailers and cants must be solidly anchored to the structure. Cut the DynaFlex into sections that can be easily handled and installed (6' - 8' [1.83 m - 2.44 m]). Starting at the top of the cant, mop the surface of the felts on the cant, and out onto the roof membrane with hot Type III or IV asphalt. Lay the DynaFlex into place on the cant and out onto the membrane a minimum of 4" (102 mm). 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 DynaFlex should be used. The DynaFlex may also be installed using MBR Flashing Cement or MBR Utility Cement. PermaMop may not be used to install DynaFlex. Mechanically fasten the DynaFlex 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.

Light gauge metals, such as copper, hot galvanized steel, or aluminum, shall be used for the edge metal. Refer to SMACNA details for recommendations on metal gauge, size, and cleat requirements. The metal sections are secured to the wood cant with rubber-grommetted fasteners, at the center of the section and at the cover plates. The vertical face of the metal can be either held by a continuous cleat, or face fastened.

Presto Lock Fascia and Flashing System

Prior to the application of the Presto Lock, the membrane is 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.

Install the Presto Lock Fascia and Flashing System, in accordance with the installation instructions provided with the product.

 

For an identical copy of this specification, ask for RS-4233.