options for classifications increase in increments of 15, e.g., Class 1A135, 1A-150, 1A-165, and higher. "Class 1A" signifies meeting ASTM E108, Class A fire performance for Class 1 roof coverings. For having three or more hailstorms annually, FM recommends roofing systems rated SH (severe hail) instead of MH (moderate hail). a. Fire/Windstorm Classification: Class 1A-//60// //75// //90// //105// //120//. b. Hail Resistance: //MH// //SH//. SPEC WRITER NOTE: Consider retaining requirement below in addition to FM Approval Listing requirement above for high windstorm classification areas (1A105 or greater) to allow for broader participation in bidding. 6. High Wind Zone Design Requirement: Contractor Option: In lieu of FM Approval Listing windstorm classification, provide roofing membrane, base flashing, and component materials that comply with County requirements. 1.4 QUALITY ASSURANCE: A. Installer Qualifications: 1. A firm with a minimum of three (3) years’ experience in type of work required by this section. 2. A firm licensed or approved in writing by manufacturer to perform work under warranty requirements of this Section. 3. Employ full-time supervisors who have worked on roofing projects of similar types and scopes for a minimum of three (3) years. B. Inspector Qualifications: Inspection of work by inspector or manufacturer technical representative experienced in the installation and maintenance of the specified roofing system who is, qualified to perform roofing observation and inspection specified in Field Quality Control Article. Inspector is to determine Installer’s compliance with the requirements of this Project, and be approved by the manufacturer to issue warranty certification. The Roofing Inspector to be one of the following: 1. An authorized full-time technical employee of the manufacturer, not engaged in the sale of products.
3.3 A. Install temporary protection at the end of day's work and when work is halted for an indefinite period, or work is stopped when precipitation is imminent. Comply with approved temporary protection plan. B. Install temporary cap flashing over the top of base flashings where permanent flashings are not in place to provide protection against moisture entering the roof system through or behind the base flashing. Securely anchor in place to prevent blow off and damage by construction activities. C. Provide for removal of water or drainage of water away from the work. D. Provide temporary protection over installed roofing by means of duckboard walkways, plywood platforms, or other materials, as approved by COR, for roof areas that are to remain intact, and that are subject to foot traffic and damage. Provide notches in sleepers to permit free drainage. 3.4 INSTALLATION, GENERAL: A. FM Approvals Installation Standard: Install roofing membrane, base flashings, wood blocking, curbs, and nailers, and component materials in compliance with requirements in FM 4450 and FM 4470 as part of a membrane roofing system as listed in FM Approval's "RoofNav" for fire/windstorm classification indicated. Comply with recommendations in FM Approvals' Loss Prevention Data Sheet 1-49, including requirements for wood nailers and cants. B. NRCA Installation Standard: Install roofing system in accordance with applicable NRCA Manual Plates and NRCA recommendations. C. Manufacturer Recommendations: Comply with roofing system manufacturer's written installation recommendations. D. Coordination with related work: Coordinate roof operations with roof insulation and sheet metal work so that insulation and flashings are installed concurrently to permit continuous roofing operations. E. Installation Conditions: 1. Apply dry roofing materials. Apply roofing work over dry substrates and materials. 2. Apply materials within temperature range and surface and ambient conditions recommended by manufacturer. 3. Except for temporary protection, do not apply materials during damp or rainy weather, during excessive wind conditions, nor while