User manual GAF TOPCOAT TITANIUM FOR METAL SPECIFICATIONS REV 11-2002

[. . . ] Topcoat Titanium Metal Specifications PART 1 - GENERAL 1. 01 RELATED SECTIONS / DOCUMENTS 1. 05 REGULATORY REQUIREMENTS GAF Detail Drawings, site-specific drawings and General Provisions of the contract, including General, Supplementary and Special Conditions found in Division7 Specification Sections, apply to the work addressed in this section. FM Listing: Provide GAF Roofing System and component materials which have been evaluated by Factory Mutual System for flame-spread and are listed in "Factory Mutual Approval Guide" for Class I construction over existing metal roofing (Flame spread must be in accordance with ASTM #E-108). Provide roof covering materials, bearing FM approval marking on package or container, which indicates that material has been subjected to FM's examination, test procedures, follow-up inspection services and approval. UL Listing: Provide GAF Roofing System and component materials which have been evaluated by Underwriters Laboratories for flame-spread, and are listed in "Underwriters Laboratory Roofing Materials and Systems Directory" for Class A construction over existing metal or other non-combustible roofing (Flame-spread must pass ASTM #E-108 with unlimited slope). [. . . ] Do not proceed with installation of the GAF Roofing System until unsatisfactory conditions have been corrected in a manner acceptable to the manufacturer (GAFMC). Preparation of the Roof Substrate is the responsibility of the Installer. Installer shall address and correct all of the following: · · · · · · · · Treatment of excessive gaps Installation of sheet metal crickets Treatment of ponding water areas Repair of dented / damaged panels Re-tightening and replacement of fasteners Thorough cleaning / Removal of existing paints and coatings Treatment of residual asphalt Treatment of rust areas C. Treatment of Excessive Gaps: All large or excessive gaps existing between roof panels must be closed or made flush with EverTiteTM self-drilling fasteners. Closed-celled foam strips or polyurethane foam may be used to pre-fill voids larger than 1/4 inch before applying GAF Flashing Grade. Foam shall be shaped with a utility knife or other method to create a cant strip which facilitates both GAF adhesion and water drainage, as well as, prevents shearing of Topester Fabric on metal edges. Installation of Sheet Metal Crickets: (Required) Sheet metal crickets must be installed according to Manufacturer's specifications (minimum 26 gauge Metal - heavier gauge required for larger crickets) on the high side of all curb units. Vertical ribs shall be cut a minimum of 2" from the cricket to allow both the cricket flanges to mount flush to the metal panel and facilitate water drainage. Cut vertical ribs shall then be treated in the same fashion as a void larger than a 1/4 inch. New crickets shall be "sealed" by placing a continuous bead of GAF Flexseal under the flanges before they are mechanically attached to the curb unit and metal roof panel. The cricket flanges must then be stitch-screwed to the curb unit and metal roof panel while the Flexseal is still wet using EverTiteTM fasteners. This procedure shall apply to Topcoat Titanium Metal Specifications be required during the pressure washing to obtain proper adhesion for GAF products. When encountering roof substrates that have living organisms such as algae, mold or fungus, a bleach solution shall be used to kill / remove these organisms during the roof cleaning. Treatment of Residual Asphalt: Installer shall make every effort to remove asphaltic roofing elements. Removal efforts must include use of methods such as pressure-washing, scrapers, wire brushes, electrical drill wire-wheels, or other similar tools. Residual asphalt is defined as asphaltic material remaining after the exercise of all required removal efforts, and exists when there is asphaltic material greater in thickness than 3 mils over an area greater than 1 square foot. Asphaltic area not to exceed 20% of the total roof area. Installation of a cap on the ridge vent will prevent water entry while allowing air to continue to flow through the vent. Inadequate roof ventilation may cause blistering in the GAF Roofing System due to inside air "blowing-out" through roof panel seams. When this condition occurs, it may not allow for proper curing of the Flashing Grade material which may cause blisters · Condensate Lines: GAFMC recommends installation of condensate lines from HVAC units to gutters as part of the overall roofing contract. Type of piping used for condensate lines may vary depending on local building codes. Treatment of Rust Areas: All rust areas must be treated with GAF MP-300 to prevent further deterioration of the metal roof panels. Prior to MP-300 application, remove all loose, flaking or powdery rust by wire brushing if it has not been removed during the pressure washing. [. . . ] Intermediate coat shall be applied parallel to the ribs of the roof panels. It should not be applied unless the base coat is clean and will provide proper adhesion. Allow a minimum of 24 hours drying time prior to allowing foot traffic or inspection of roof surface. Spray-Apply Final Coat (white) of GAF Roofing Membrane at the rate of 1. 50 gal per 100 square feet. [. . . ]