To tell you the truth, my company and I don't really like wood floor trusses. Even when we install them within a day or two of delivery, the low-grade lumber favored by truss plants for cost savings starts twisting and bowing hours after delivery.And bad stock isn't the only problem. The steel plates that help hold the individual components together sometimes overhang the truss end or a top or bottom chord. The projecting metal can prevent the truss from sitting flat on the mudsill or plate, or it can create a hump in the subfloor or wall sheathing. Sometimes the lumber components aren't cut flush with each other and an overhanging piece must be trimmed with a saw or power plane.If you've never used them, open-web floor trusses are a type of parallel-chord truss, usually from 111/4 in. to 24 in. deep. The top horizontal member (chord) has subfloor nailed to its top. The bottom chord usually has a drywall ceiling. In between the chords, webs arranged in triangular sections give the 2x4 chords their strength. All of these components are joined with spiky metal connectors called truss plates.
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