GREENSTONE SLATE Guide to Roof Installations © 2002 Greenstone Slate Company, Inc
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GREENSTONE SLATE Guide to Roof Installations © 2002 Greenstone Slate Company, Inc. © 2001 National Roofing Contractors Association We wish to thank the NRCA for allowing us to reprint portions of their Fifth Edition Roofing and Waterproofing Manual Slate Roofing Manual Table of Contents General Information Slate Roof Systems.............................................................................................................................................................. 1 Types of Slate Roof Systems .............................................................................................................................................. 1 Active Slate Quarries............................................................................................................................................................ 1 Slate Tools .......................................................................................................................................................................... 1 Components Slate .................................................................................................................................................................................... 3 Material Description ............................................................................................................................................................ 3 Colors.................................................................................................................................................................................. 3 Weight ................................................................................................................................................................................ 4 Quantities per Square. ........................................................................................................................................................ 5 Standards ............................................................................................................................................................................ 5 Underlayment ...................................................................................................................................................................... 6 Asphalt-saturated Felt.......................................................................................................................................................... 6 Polymer-modified Bitumen Sheet Underlayments ................................................................................................................ 7 Ice Dam Protection Membranes .......................................................................................................................................... 7 Asphalt Roof Cements ........................................................................................................................................................ 8 Design Considerations Roof Decks.......................................................................................................................................................................... 9 Wood Plank and Board Decking .......................................................................................................................................... 9 Structural Wood Panel Decking............................................................................................................................................ 9 Preservative-treated and Fire-retardant-treated Wood.......................................................................................................... 10 Other Deck Types ................................................................................................................................................................ 10 Underlayment and Roof Slope ............................................................................................................................................ 10 Underlayment Configurations .............................................................................................................................................. 11 Roof Slope .......................................................................................................................................................................... 11 Ice Dam Protection Membranes .......................................................................................................................................... 11 Fasteners ............................................................................................................................................................................ 14 Exposure and Appearance .................................................................................................................................................. 15 Starter Course .................................................................................................................................................................... 16 Eave Cant ............................................................................................................................................................................ 16 Flashings.............................................................................................................................................................................. 16 Perimeter Edge Metal .......................................................................................................................................................... 16 Penetration Flashings .......................................................................................................................................................... 16 Valley Construction .............................................................................................................................................................. 17 Open Valleys........................................................................................................................................................................ 18 Enhanced Open Valleys ...................................................................................................................................................... 20 Closed Valleys...................................................................................................................................................................... 20 Rounded Valleys (Closed) .................................................................................................................................................... 20 Vertical Surfaces .................................................................................................................................................................. 20 Apron Flashings .................................................................................................................................................................. 21 Step Flashings .................................................................................................................................................................... 21 Cricket or Backer Flashings.................................................................................................................................................. 22 Counterflashings .................................................................................................................................................................. 24 Ridges ................................................................................................................................................................................ 25 Slate Ridge .......................................................................................................................................................................... 25 Slate Saddle Ridge ............................................................................................................................................................ 25 Strip Saddle Ridge .............................................................................................................................................................. 25 Combing Slate Ridge .......................................................................................................................................................... 26 Metal Ridge.......................................................................................................................................................................... 26 Hips .................................................................................................................................................................................... 26 Slate Hip .............................................................................................................................................................................. 27 Saddle Hip .......................................................................................................................................................................... 27 Mitered Hip .......................................................................................................................................................................... 27 Fantail Hip...........................................................................................................................................................................