1519.5 Mechanical Attachment

All mechanically attached roofing components shall be attached to the various types of substrates in compliance with the requirements set forth in the roofing assembly product approval and the following minimum requirements.

Nails shall be minimum 12 gage, annular ring shank nails having not less than 20 rings per inch; heads not less than ³/₈ inch (9.5 mm) in diameter; and lengths sufficient to penetrate through the thickness of plywood panel or wood plank decking not less than ³/₁₆ inch (5 mm), or to penetrate into a 1-inch (25.4 mm), or greater, thickness of lumber not less than 1 inch (25.4 mm). Nails shall be hot dipped; electro- or mechanically galvanized to a thickness sufficient to resist corrosion in compliance with Appendix E of TAS 114. All nails shall have product approval. All nail cartons or carton labels shall be labeled to note compliance with the corrosion-resistance requirements. No roofing material shall be fully or partially adhered, unless otherwise noted in the roof assembly product approval directly to a nailable deck.

Tin caps shall meet the requirements of Section 1517.5.2.

Prefabricated fastener systems complying with Sections 1519.5.1 and 1519.5.1.1 may be used, provided they are product approved.

Spacing of such fasteners shall be in compliance with patterns set forth in the roofing assembly product approval.

Where the architectural appearance of the underside is to be preserved, a base sheet may be secured in an alternate method of attachment prepared, signed, and sealed by a Florida-registered architect or engineer, or in buildings where the mean roof height does not exceed 15 feet (4.6 m), a base sheet may be secured with 1¹/₄-inch (32 mm) fasteners on supporting members, with a minimum of ¹/₂-inch (12.7 mm) fasteners between the supporting members, all of which shall be secured through tin caps and nailed 6 inches (152 mm) o.c. in all directions.

All lightweight insulating concrete shall be vented per roofing system manufacturer recommendations.

Lightweight concrete shall not be applied over an existing roof deck unless the supporting structure has been approved as adequate to sustain the added weight. Calculations verifying the adequacy of the existing structure to sustain the added weight shall be prepared, signed, sealed and dated by a Florida-registered architect or engineer, who is proficient in structural design, and submitted with the uniform roofing permit application.

The mechanical attachment of roofing components to other nailable decks shall be governed by the roofing assembly product approval.