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High Wind Standards

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High Wind Standards HIGH WIND STANDARDS 2015 Table of Contents Program Overview and Definitions ..................................................................................................................... 4 Goals ........................................................................................................................................................................... 4 FORTIFIED Home Eligible Dwellings ............................................................................................................................ 4 Definitions and Conditions ......................................................................................................................................... 4 Foundation Qualification Requirements ..................................................................................................................... 5 Available Designations ................................................................................................................................................ 6 Objectives ................................................................................................................................................................... 6 Designation Term Limit ............................................................................................................................................... 7 Definitions ................................................................................................................................................................... 8 FORTIFIED Roof Designation Requirements ....................................................................................................... 12 General Requirements .............................................................................................................................................. 12 Existing Roof Designation ......................................................................................................................................................... 12 New Roof Designation .............................................................................................................................................................. 13 Detailed Requirements ............................................................................................................................................. 14 Existing Roof Designation ......................................................................................................................................................... 14 Roof Deck Attachment .......................................................................................................................................................... 14 Prune trees to reduce risk of trees falling on house ............................................................................................................. 16 Requirements .................................................................................................................................................................. 16 New Roof Designation .............................................................................................................................................................. 16 Addressing deteriorated or damaged roof decking or lumber on an existing home............................................................. 16 Requirements .................................................................................................................................................................. 17 Deteriorated or damaged wood roof framing member(s) .................................................................................................... 19 Requirements .................................................................................................................................................................. 19 Strengthening of roof sheathing attachment ........................................................................................................................ 21 Re-nailing the roof decking ............................................................................................................................................. 21 Sawn Lumber or Wood Board Roof Decking: Existing Roof .......................................................................................... 21 Structural Wood Panel (Plywood or Oriented Strand Board-OSB) Roof Sheathing ...................................................... 21 Existing Roof (re-nailing the roof decking) ................................................................................................................ 22 New Roof (attaching the roof deck).......................................................................................................................... 24 Sealing the roof deck ............................................................................................................................................................. 25 Options for shingle or metal roofs .................................................................................................................................. 25 Options for concrete and clay tile roofs .......................................................................................................................... 27 Drip Edge Requirements........................................................................................................................................................ 30 Flashing Requirements .......................................................................................................................................................... 30 Installing qualified roof covering (re-roof or new roof installation) ...................................................................................... 30 Asphalt Shingles .............................................................................................................................................................. 30 Wind Testing/Rating Standards ................................................................................................................................... 30 Shingle Attachment ...................................................................................................................................................... 31 Clay and Concrete Roof Tiles ........................................................................................................................................... 31 Clay and Concrete Tile Wind Resistance Requirement ................................................................................................. 31 Metal Panels ................................................................................................................................................................... 32 Metal Roof Wind Resistance Requirement................................................................................................................... 32 Other roof coverings ....................................................................................................................................................... 32 Prune trees to reduce risk of trees falling on house ............................................................................................................. 33 Requirements .................................................................................................................................................................. 33 FORTIFIED Silver Designation Requirements ...................................................................................................... 34 General Requirements .............................................................................................................................................. 34 Detailed Requirements ............................................................................................................................................. 35 Strengthening Gables Over 4 Ft Tall ......................................................................................................................................... 35 Gable End Wall Sheathing ..................................................................................................................................................... 35 Gable End Wall Bracing ......................................................................................................................................................... 35 2 Prescriptive Methods for Existing Homes ............................................................................................................................. 36 Securing Chimneys ................................................................................................................................................................... 37 Prescriptive retrofit measures ............................................................................................................................................... 37 Engineering-Based Measures ................................................................................................................................................ 39 Anchoring Attached Structures (Porches and Carports) ........................................................................................................... 39 Existing Home .......................................................................................................................................................................
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