The 1802 is an insurance form which has a disclaimer in question # 8(SWR) in which it reads that, “standard underlayments or hot mopped felts are not SWR”. I answer unknown. In my opinion I believe this is one for a class action. Again, the current 1802 conflicts with the FBC, but no one cares, so remember, remove the FBC from your heads and do an insurance inspection.
From the 2007 FBC
611.7.2 Roof secondary water barrier for site-built single-family residential structures. A secondary water barrier shall be installed using one of the following methods when roof covering is removed and replaced:
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- In either HVHZ or non-HVHZ regions,
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a) All joints in structural panel roof sheathing or decking shall be covered with a minimum 4-inch (102 mm) wide strip of self-adhering polymer modified bitumen tape applied directly to the sheathing or decking. The deck and self adhering polymer modified bitumen tape shall be covered with one of the underlayment systems approved for the particular roof covering to be applied to the roof.
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b) The entire roof deck shall be covered with an approved asphalt impregnated 30# felt underlayment or approved synthetic underlayment installed with nails and tin-tabs in accordance with Section R4402.7.2, R4402.7.3 or R4402.7.4 of the Florida Building Code, Residential. (No additional underlayment shall be required over the top of this sheet.) The synthetic underlayment shall be fastened in accordance with the manufacturer’s recommendations.
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- Outside the High Velocity Hurricane Zone:
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a) The entire roof deck shall be covered with an approved self-adhering polymer modified bitumen sheet meeting ASTM D 1970 or an approved self-adhering synthetic underlayment installed in accordance with the manufacturer’s installation instructions. No additional underlayment shall be required on top of this sheet for new installations.
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b) An underlayment system approved for the particular roof covering shall be applied with the following modification:
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(1) For roof slopes that require one layer of underlayment, a layer of approved asphalt impregnated ASTM D 226 Type I or Type II underlayment or approved synthetic underlayment shall be installed. The felt is to be fastened with 1-inch (25 mm) round plastic cap or metal cap nails, attached to a nailable deck in a grid pattern of 12 inches (305 mm) staggered between the overlaps, with 6-inch (152 mm) spacing at the overlaps. The synthetic underlayment shall be fastened in accordance with the manufacturer’s recommendations.
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(2) For roof slopes that require two layers of underlayment, an approved asphalt impregnated ASTM D 226 Type I or Type II underlayment shall be installed in a shingle-fashion and lapped 19 inches (483 mm) and fastened as described above. An approved synthetic underlayment shall be installed in accordance with the manufacturer’s installation instruction. (No additional underlayment shall be required over the top of this sheet.)
(HHHHHERE IS THE KICKER)
Exceptions:
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**1. Roof slopes < 2:12 having a continuous roof system shall be deemed to comply with Section 611.7.2 requirements for a secondary water barrier.
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**2. Clay and concrete tile roof systems installed as required by the Florida Building Code are deemed to comply with the requirements of Section 611.7.2 for secondary water barriers.