Floor Trusses

JLC Field Guide: Floor Trusses

Structurally, an open-web floor truss resembles an I-beam in that it puts most of its material along its top and bottom edges where stresses are greatest. To strengthen a truss, the fabricator may double its top and bottom chords, make side-by-side girder trusses, use larger truss plates or stronger wood, or use some combination of these techniques.

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Floor Trusses Featured Articles

Framing Fix for a Faulty Foundation
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Framing Fix for a Faulty Foundation

A foundation that is out-of-level and out-of-square can be fixed by shimming the... More

RedBuilt Metal & Wood Composite Floor Truss Review
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RedBuilt Metal & Wood Composite Floor Truss Review

These trusses have enabled some really cool architectural features. More

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Beefing Up a Brooklyn Brownstone's Floors and Roof

A 100-year-old row house’s structural brick walls are more than adequate for the building’s loads. But the floors and roof? Not so much. Here’s a look at how the architect, engineer, and builder teamed up to get modern performance from a historic structure. More

Running a Timber-Framing Business
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Running a Timber-Framing Business

Modern tools bring this traditional building method into the 21st century. More

Framing the First-Floor Deck
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Framing the First-Floor Deck

The work goes faster if you use a laser, install anchor straps instead of anchor... More

Floor Trusses Instruction

Bracing Floor Trusses
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Bracing Floor Trusses

With floor trusses, bracing becomes a permanent part of the floor structure. More

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How Strong Are SIPs?

Q: In a SIP, how secure is the bond between the OSB skin and the EPS (expanded polystyrene) core? Can this bond be compromised by water infiltration or insect damage, or could the insulated core deteriorate over time? If that bond were to fail, it seems to me the whole structure would fall apart like a giant house of cards. More

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Should Floor Trusses Be Attached to Walls Below?

Q. What is the proper way to attach an interior basement wall to floor trusses ? both perpendicular walls and walls that run parallel with the bottom chord and fall between the trusses. I have been told to nail directly to the trusses, and I have bee More

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Q&A: Long-Span Floor Joists

Q. Would floor trusses or wood I-joists be stronger over a 26-foot span? More

Q&A: Plumbing Around Floor Trusses
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Q&A: Plumbing Around Floor Trusses

Q: We’re installing a fiberglass tub unit over a truss-framed floor. A small plan... More

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