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Agency Hurricane Mitigation Job Aid

Agency Hurricane Mitigation Job Aid. 2007. Homeowner Hurricane Mitigation Tools. Contents Roof Types Structural Hurricane Mitigation Requirements Hurricane Straps Gable End Wall Bracing Roof Sheathing Roof Covering Door/Garage track system Bracing Additional Recommendations.

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Agency Hurricane Mitigation Job Aid

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  1. Agency Hurricane Mitigation Job Aid 2007

  2. Homeowner Hurricane Mitigation Tools Contents • Roof Types • Structural Hurricane Mitigation Requirements • Hurricane Straps • Gable End Wall Bracing • Roof Sheathing • Roof Covering • Door/Garage track system Bracing • Additional Recommendations Sources: IBHS.org, blueprintforsafety.org

  3. Homeowner Hurricane Mitigation Tools Hip Roof Gable Roof Hip: the external angle formed by the intersection of two sloping roof planes. Gable: a triangular-shaped portion of the endwall of a building directly under the sloping roof and above the eave line.

  4. Homeowner Hurricane Mitigation Tools Roof Hurricane Straps: Hurricane straps secure the roof to the walls. High winds experienced in a typical storm can blow the roof off of the house. Metal hurricane straps provide the proper measure of strength and safety for the roof-to-wall connection. The straps must be installed with the proper number and type of nails per manufacturer’s specifications and be capable of handling wind uplift pressure of 120 mph.

  5. Homeowner Hurricane Mitigation Tools Roof Bracing for Gable Ends: Homes with gabled roofs are more likely to suffer damage than homes with hip roofs because winds push into the flat ends of gabled roofs but pass over the steep pitch of hip roofs. Roof bracing for gable ends greatly increases the structural integrity of the gable end and supporting trusses. All gable end walls must be tied back to the roof or ceiling structure and bracing capable of providing wind resistance to 120 mph.

  6. Homeowner Hurricane Mitigation Tools Roof Sheathing: The roof sheathing material shall be plywood, have a minimum nominal thickness of 19/32”, be continuous over two or more spans, and be nailed in a pattern with 10 d nails every 4” along the panel edges and every 6” In the field of the panel. Must be capable of withstanding120 mph winds. Roof Covering: If asphalt shingles must meet ASTM D 3161, Class F for 120 mph winds and shall bear a label indicating such compliance has been met. Roof systems may have only one layer of covering. plywood roof sheathing

  7. Homeowner Hurricane Mitigation Tools Garage and Other Door Bracings: Horizontal braces make garage doors stronger. Garage door tracks must also be reinforced. Entry doors must be strong and secure enough to resist wind pressures and storm debris. All doors must be pressure/impact resistant or have bracing designed to withstand both positive (inward) and negative (outward) wind pressure in accordance with ASTM (American Society for Testing and Materials) E330 for 120 mph winds.

  8. Homeowner Hurricane Mitigation Tools The following are recommended but not required for homeowners in hurricane-prone areas: • Exterior Structures: Without proper connections, porches, screen enclosures and decks can be destroyed in a hurricane. To prevent this from happeningattach exterior structures to the main structure by means of an anchoring system in accordance with ASCE (American Society of Civil Engineers) 7-98. • Soffits: Aluminum and vinyl soffits are often blown off homes during a hurricane. Utilize wood supports to strengthen aluminum and vinyl soffits. Keeping soffits in place can also help keep water out of your house.  • Hurricane Storm Shutters: Shutter all windows, entry doors, gable end vents and skylights in accordance with ASTM E1996. Hurricane shutters are used to prevent windows from being broken by flying objects during a storm. When a window is broken, the air pressure may rise inside a building, causing the roof to break apart. This, in turn, weakens the walls of the structure, causing the walls to fall and the entire building to collapse. Hurricane shutters stop this chain reaction from happening by shuttering the openings with a strong, durable, waterproof material.

  9. Homeowner Hurricane Mitigation Tools • Secondary Water Barriers: Prevent water intrusion by using strips of “peel and stick-on” material that covers the joints between the plywood sheets on the roof to reduce leakage until repairs can be made if a hurricane blows off roof shingles. This can be done in two ways: • Interior secondary water barrier – installed by accessing the underside of the roof via the attic. • Exterior secondary water barrier – can be added when new roof is installed.

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