This is Part 3 of our seven-part series explaining the roof deck attachment section of the wind mitigation form. Section 3 addresses the roof deck attachment, also referred to as roof sheathing, which is typically made of plywood, OSB, or dimensional lumber.
What do I need to qualify for the roof deck attachment discount?
To qualify for the wind mitigation discount, a home must use at least 8D nails. Nails should be spaced every 6 inches to meet code, though the form also allows for 12-inch spacing. Most insurance carriers do not differentiate between these options, but requirements may vary. For dimensional lumber roof decks, use two nails per board, or one if the board is 6 inches or less. Contractors may also use approved screws or adhesives with an uplift resistance of 55 psf, though these are uncommon in practice.
When were the current requirements implemented?
Currently, roofs must be fastened with 8D nails spaced every 6 inches. For homes constructed prior to the implementation of the current Florida Building Code (FBC) on March 1, 2002, requirements may differ. Certain jurisdictions in Florida mandated the use of nails before 2002. If a roof was installed after 2010 and was not re-nailed, it is likely that the installation was performed by a low-cost contractor and possibly without a permit.
What type of attachment was used before 8D nails?
Most older homes built before the current FBC had decks attached with staples or small nails like 6d. If these are the only attachments, the house will not qualify for the discount. When a new roof is installed, the contractor adds 8d nails to bring it up to code.
To find out if your house qualifies for this discount, call us at 407-633-1661 to schedule a wind mitigation inspection, or book online.