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' j'.- <br />sufficient to fasten the deck boards firmly to the nailing surface <br />(timber framing or nailers) and provide a flat, even walking surface <br />free from warp of any kind. Decking shall be screwed down for easy <br />removal in those locations where electrical boxes, valves, drains, <br />etc. roust be accessed. Where decking is fastened directly to steel <br />frames, fastening shall be done with galvanized self tapping screws <br />of a size and strength adequate to prevent shearing and breaking <br />under normal operating conditions. Deck screws shall have heads <br />flush with the deck surface or slightly depressed to provide a flat, <br />even walking surface. Deck screws shall be installed so as not to <br />fracture the wood and cause splintering at the i le. Number of <br />screws used per connection shall be adequate to f mly^ attach the <br />deck boards and provide a flat, even walking surfat . Fasteners of <br />whatever type shall be located in symmetrical patterns throughout <br />with fasteners in straight lines. <br />3.1.1.9 Deck Board Snaclno: Deck boards shall be installed with a 1/8 inch <br />space between adjacent deck boards. Decking shall be installed <br />perpendicular to the longitudinal axis of the pier. <br />3.1.1.10 Deck Board Support and Installation: Deck boards shall be supported <br />at a ouiximum of 3 feet on center with the boards laid with the best <br />side up or if there is no best side then L rk side up. <br />3.1.1.11 Oneninos: Openings between adjacent floating pier modules shall not <br />exceed 1-1/2 inches, however, the opening between adjacent pier <br />module end deck boards shall not exceed 1/8 inch. All connections <br />between floating pier modules shall not protrude above the level of <br />the pier surface. <br />3.1.2 Floatation Units: Floatation shall be provided by closed cell <br />polystyrene cellular materials, either preformed or expanded in place. <br />The floatation material shall be fully encased in at least 20 gauge <br />galvanized steel sheet metal, marine aluminum at least 0.124 inches <br />thick, medium density polyethylene with a nominal thickness of 0.1875 <br />Inches, wood having a nominal thickness of 2 inches, or a combination <br />of these materials. In the past, polystyrene filled, end capped <br />galvanized corrugated pipe of a least 20 gauge have been used as <br />floatation units. Substitution of floatation units consisting of <br />closed end, polystyrene filled pipe having a minimum wall thickness of <br />1/8 Inch are acceptable. Such floatation units shall be completely <br />galvanized Including end c'.osure plates. If the pipe is used as a <br />structural component, its thickness shall be sized accordingly. Pipe <br />and galvanizing shall meet applicable requirements described else <br />where in these specifications. <br />3.1.2.1 The floatation units shall be securely connected to the pier framing <br />and deck so that the floating pier including floatation acts as an <br />integral unit within the tolerances specified without damage or <br />separation. The connections must be such as to prevent the tearing <br />away or other damage to the floatation units and/or pier frames at the <br />points of connection. Materials used to attach floatation units shall <br />have a life expectancy as long as the unit itself. <br />- 13 -