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When compared to traditional joist construction, manufactured wood floor truss systems are better, stronger, and can be installed faster.
A manufactured floor truss is an engineered structural component assembled from wood members, metal connector plates and other mechanical fasteners. The truss members form a semi-rigid structural framework and are assembled such that the members form triangles. Most builders are familiar with roof truss systems, but may not realize the advantages of a manufactured floor truss system.
The benefits of manufactured wood truss floor systems are many. Floor trusses can span great distances, creating larger open spaces below unobstructed by columns and partitions. Also, the open web design allows for the trusses to expand and contract with humidity and heat. This can help ensure greater long-term stability and reduce the chance of annoying floor squeaks.
The floor truss systems are quicker and easier to install than traditional floor joists, and because they're manufactured in controlled environments, there's less chance of warping, shrinking, and twisting of lumber. Manufactured floor truss systems also save timber resources by reducing the amount of waste wood generated during construction. The consistent size and height of the manufactured floor joist will mean easier subfloor material installation, and the open web design allows for utilities to be run between the floor system without drilling or cutting holes. These benefits will reduce the amount of time trade contractors spend on site, speed up construction, and ultimately save the builder money. READ MORE....
Name the roof type - gable, hip, mansard, gambrel - and it can be framed with metal plate connected wood trusses. Precision-made from dimension lumber and metal connector plates, pre-fabricated trusses have revolutionized roof framing over the last three decades. Lightweight and needing no on-site assembly, trusses give builders a bigger bang for their buck. Truss-framed roofs can be erected faster and with less skilled labor than stick-built roofs. Often, trusses go up and sheathing down on the same day, so closure against the weather comes sooner. Trusses long, clear spans offer greater flexibility with floor plans. And since interior bearing walls aren't needed, their expensive underpinnings aren't needed either. Highly efficient in their usage of lumber, trusses help conserve forest resources. Most often made of 2x4s and spaced 24 in. o.c., a truss-framed roof uses less wood than one stick-built from 2x6 or 2x8 rafters and joists 16 in. o.c.
How roof trusses work:
Triangles are naturally rigid geometric shapes that resist being distorted when pushed on. In the upright position, a truss is rigid for the same reason. Regardless of its overall shape, all its chords and webs form triangles, or triangulate. Stick-built roofs operate on the same principle, with rafters, ceiling joists, and collar ties forming the triangles. Under the weight of sheathing and roofing, a roof truss as a whole is stressed in bending. Its chords and webs, however, are stressed principally in either tension or compression. Top chords, which are in compression, push out at the heel and down at the peak. The bottom chord, firmly fastened to the top chords, is stretched in tension to resist the outward thrust. The result is a stable, self-balancing structure.
One important difference between stick-built and truss-framed roofs is that ceiling joists rarely span the width of the building. Instead, they bear on interior partitions, as well as on exterior walls. Roof trusses are almost always designed to bear only on exterior walls, with the webs connecting the top and bottom chords providing intermediate support. That's why webs, depending on their location, are stressed in either tension or compression. READ MORE...