Jesse Gonzalez joins Bob at the Punta Gorda storm-ready home to explain the roofing process. The crew has already nailed on the 30 pound asphalt-impregnated felt paper. They are now hot mopping 90 pound roll roofing with asphalt adhesive to make it adhere to the felt paper below. Gonzalez shows Bob the decorative wood dormers on the front of the house that are wrapped in house paper to protect against water intrusion. Bob remarks on the decorative arches above the front entry porch and the front window. They mirror each other as design elements and will both feature decorative columns. Around the back of the house the crew is completing a section of roofdeck. They are using 5/8-inch plywood sheathing for a stiffer, more wind-resistant roofdeck. The crew uses metal plywood clips to align the plywood and keep it even for nailing.
Bob and Chris Vila meet with David and Jed Walentas from Two Trees Development, the developers of the waterfront warehouse rehab, on the top of a nearby building to get some ideas for the project building's roofdeck. In this example, the roof below the deck is a double-ply rubber membrane. Portions of the deck are made with pressure treated timbers and a renewable hardwood decking called ipe, although the majority of the surface area is concrete pavers. New York City building codes will be a major consideration in the construction of the Pepper Factory's roof configuration. Jed Walentas highlights some of the major factors, including the height of the safety railing and the percentage of combustible materials that can be used in rooftop construction.
Bob talks with Leslie Chapman-Henderson from the Federal Alliance for Safe Homes (FLASH) about the technologies involved in securing a roof. Chapman-Henderson explains the importance of keeping a roof secure in high-wind situations. Uplift force is explained as wind is that pulls on a roof, with a force that can tear the roof right off the home, causing catastrophic building failure. Keeping a roof secure involves affixing the roofdecking, the plywood, so no new holes are created during a storm that would allow more wind to come in. FLASH standards specify plywood of a certain thickness, 5/8" minimum thickness with 6" inch nailing pattern, securely nailing into the trusses. Pneumatic nail guns, employed in a hurry to save costs, often miss the underlying truss. Simpson StrongTie straps are used to secure the truss to the structure. Tie-downs secure the roof vertically and horizontally. Bob and Chapman-Henderson review the Punta Gorda storm-ready project completed last season. The house in Punta Gorda was a monlithic concrete structure, poured in one solid pour with steel reinforcing bars embedded throughout. Steel fastenerstied directly to the exposed rebar to secure the roof. The roofdecking and tie-down followed FLASH's Blueprint for Safety, just as the current roof does. Chapman-Henderson presents Bob with an award from the Governor's Hurricane Conference for his work to increase awareness of the need for storm-resistant homes. According to Chapman-Henderson reviews the governor's program that makes $250 million in Florida funds and $100 million from HUD to help people in Florida retrofit their homes to bring them up to code and make them storm resistant. The My Safe Florida Home is available to low- and modest-income residents. Eligible viewers are encouraged to call the 800 number or go to mysafefloridahome.com to begin the process.
How much of a gap should there be between the furnace vent pipe and the hot water heater vent pipe and the roofdecking on a roof penetration? Do you need to use fire proof/retardant caulk in the air gap?
Anyone have any written requirements for the removal of decking nails used in OSB decking that do not make contact with the trusses they are intended to be driven into? I have been told that over time wind, heat, and cold cycles cause the nails to withdraw causing possible roof shingle leakage.
Getting my roof replaced. The decking is 1x12's. Is this decking in compliance with most shingle manufacturer's warranty? I'm being advised that most shingle manufacturers do not warranty their shingles when attached to 1x12's. Thanks.