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IRC-1838 Indian River County <br />Main Library <br />Roof Replacement 06 10 00-6 Rough Carpentry <br />joints shall be installed to match insulation height. Maintain constant nailer height at <br />perimeter edges. <br />D. Wood blocking and nailers shall be installed concurrently with roof system installation. <br />Removal of insulation and/or folding back of roof membrane to install wood blocking and <br />nailers at a later date is not acceptable. <br />E. Set rough carpentry to required levels and lines, with members plumb, true to line, material <br />cut to fit, and braced to hold work in proper position. Use a belt sander to remove any <br />obtrusive surface irregularities. Drive nails and spikes home; and pull bolt nuts tight with <br />heads and washers in close contact with the wood. <br />F. Fit rough carpentry to other construction; scribe and cope for accurate fit. Correlate <br />location of furring, nailers, blocking, grounds, and similar supports to allow attachment of <br />other construction. All joints between wood shall be installed for a smooth transition. <br />G. Attachment: <br />1. The Contractor shall consult the fastener manufacturer’s published literature and <br />follow the recommended requirements for pre-drilling, cleaning, placement and <br />compatibility of substrates. Follow manufacturer’s requirements for fasteners <br />spacing, substrate preparation and substrate embedment where not specified. <br />2. Securely attach rough carpentry work to substrate with fasteners. Anchor to resist <br />a minimum force of 300 lbs/lineal foot in any direction. <br />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 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 from <br />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 twisting <br />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.