Any hardware used to connect or hold construction materials together, such as nails, screws, and bolts.
A fastener is any mechanical device used to join or connect construction materials, including nails, screws, bolts, anchors, and clips. Fastener selection depends on the materials being connected, load requirements, exposure conditions, and applicable code requirements. Incorrect fastener selection or spacing is a common cause of structural failure and warranty claims.
Fasteners are easy to overlook on a takeoff yet drive both material cost and labor productivity, since spacing and type dictate how many a crew installs per square foot. Specifying the wrong corrosion rating or pull-out capacity exposes a contractor to callbacks, warranty claims, and uplift or seismic failures that fall outside the original bid.
A roofing estimator prices stainless ring-shank nails at the spacing called out in the high-wind addendum rather than standard galvanized nails, adding a few hundred dollars in hardware but protecting against uplift-warranty exposure.
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