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3. Rough carpentry attachment shall meet the requirements herein and that of the <br /> current FM Loss Prevention Data Sheet 1-49,Perimeter Flashing. <br /> 4. Install bolts flush with the top surface of nailers where possible to avoid <br /> countersinking. Bolt bottom nailers then fasten upper nailers where possible. <br /> Countersink bolts,nuts and screws flush with wood surfaces only as detailed. <br /> 5. Install fasteners without splitting wood. Pre-drill where necessary. Split or <br /> damaged wood shall be removed, or repaired and/or re-secured secured to provide <br /> acceptable conditions. <br /> 6. For anchors, pre-drill concrete and masonry units to prevent damage or cracking <br /> of the masonry. Consult fastener manufacturer's published guides. Damaged <br /> masonry shall be repaired, and fasteners shall be removed and re-installed in an <br /> acceptable location. <br /> 7. Fastener spacing: Fasteners shall be staggered 1/3 the board width and installed <br /> within 6"of each end. <br /> a. Bolts, adhesive anchors, wedge and sleeve anchors, and machine bolts <br /> securing nailers shall be spaced 48 inches on center, staggered and an <br /> additional fastener within 6 inches of each end of nailer to prevent boards <br /> from twisting at board joints. Secure at 24"on center in corners(Zone 3) <br /> of the roof area. <br /> b. Screws and 1/4 inch diameter anchors securing wood to concrete or <br /> masonry units shall be spaced 12 inches on center maximum, staggered, <br /> with fasteners installed at each end of nailer lengths to prevent wood <br /> from twisting at board joints. <br /> c. Screws securing wood to wood shall be installed 12 inches apart, <br /> staggered,with two screws installed within 6 inches of each end of nailer <br /> lengths to prevent wood from twisting at board joints. <br /> d. Screws securing wood to steel decking shall be 12 inches apart. <br /> e. Self-drilling, and/or pre-drilled self-tapping screws securing wood to <br /> structural steel shall be spaced 12 inches apart, staggered,with one screw <br /> within 6 inches of each end of nailer lengths to prevent wood from <br /> twisting at board joints. <br /> f. Nails securing wood to wood shall be spaced 12 inches apart, staggered, <br /> with two nails installed within 6 inches of each end of nailer lengths to <br /> prevent wood from twisting at board joints. <br /> H. Select fasteners of size and length that will not be exposed from the building interior <br /> and/or from the ground, or remove protruding fasteners, paint or finish to eliminate <br /> exposure. <br /> I. Thickness of wood nailers shall be flush with adjacent insulation and other materials. <br /> Additional fasteners shall be installed to ensure nailers are flush. <br /> J. Unless otherwise detailed, plywood used as blocking or shim shall be installed below <br /> dimensional lumber such that the fastener head terminates at the dimensional lumber <br /> surface. <br /> K. Wood nailers at roof perimeters,expansion joints,roof area dividers, etc. shall not be less <br /> than 3 feet long. <br /> L. When multiple nailers are installed stacked two high or more, offset nailers no less than <br /> 12" such that joints at nailer end do not line-up vertically. <br /> M. Each end of nailers shall be fastened with additional fasteners to ensure .a smooth <br /> Sebastian Corners Roof.Replacement 06 10 00-8 Rough Carpentry <br />