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ESD4 <br />ESD-4 <br />1. In geographic regions exposed to freeze -thaw conditions feld-applied sealing the <br />entire paving area, including joints, after installation is mandatory. <br />2. Conform to sealer manufacturer's recommendations for application and <br />maintenance of sealer. <br />2.4 PHYSICAL PROPERTIES: <br />A. Compressive strength: Minimum 5,000 psi. <br />B. Size 12" wide x 2-1/2" thick or (12" wide x 3" thick for Long -Span), length as required for <br />widthofstair. Note to Specifier: Standard widths are from 36"to 48"for 2-112"thick <br />treads. Standard width for Long -Span treads, 3" thick, is from 49" up to 964. (Maximum <br />free span of 3" thick open riser treads is not to exceed 60"). <br />C. Weight: <br />1. Open Riser: 30 pounds per square foot at 2-1/2 inches thick; 36 pounds per <br />squarefoot 'aW <br />2. Closed Rise 37.2 ounds per lineal foot at 12 inch de th. <br />3. Long -Span Closed Riser: 48 poun s per (meal act at 12 inch deA� <br />4. Landin Units: 30 ounds er square foot at 2-1/2 inches thick}i'6 pounds per <br />square oot at3inches thick. <br />D. Water absorption: Not more than 6.0%average, not more than 7.0%for any individual <br />unit for standard colors. <br />E. Unit size: Within 3/16 inch of designated length, width and thickness. <br />2.5 ATTACHMENT ACCESSORIES: <br />A. For Bolting to Wood stringers: <br />1. 11 gauge galvanized steel angles, 1-5/8" x 3" x 7-1/4" long. <br />2. Non -corrosive threaded inserts with 3/8" bolts with flat washer and lock washer. <br />3. 3" x 3/8" plated lag bolts. <br />4. 4 gauge galvanized steel starter nosing brackets. <br />PRECAST CONCRETE STAIR TREADS <br />034819 - 8 <br />