Engineered Lumber Floors

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Framing Floors With I-Joists

A Cape Cod builder tells how to frame flat, squeak-free floors with wood I-joists. More

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Wood I-Joist Do's and Don'ts

Wood I-joists differ structurally from solid wood, and so do the rules for cutting, supporting, and fastening them. A manufacturer’s field rep tells how to avoid common I-joist framing mistakes. More

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Practical Engineering: Wood I-Joist Fundamentals

How an I-joist works More

A Flush-Framed Floor to Maximize Space
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A Flush-Framed Floor to Maximize Space

Eliminating a dropped beam and a brick pier in a basement remodel required the use... More

Framing Over a Complex Foundation, Part II
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Framing Over a Complex Foundation, Part II

This follow-up article to "Mudsill Layout for a Complex Foundation" describes... More

Mudsill Layout for a Complex Foundation
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Mudsill Layout for a Complex Foundation

When it comes to laying out a complex foundation, attention to detail makes the... More

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Engineered Lumber Floors Instruction

Flush-Framed Floor Joists
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Flush-Framed Floor Joists

Install joists higher than the girder to accommodate shrinkage. More

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Fix for Bouncy I-Joists?

Q: Instead of glue and nails, my framing subcontractor used screws to fasten the sheathing to the I-joists of a new 14-foot-wide addition. While there are no interior walls bearing on the floor system and no excessive notching in the I-joist flanges - and the joists fall well within the APA's allowable span guidelines - my clients say their floor is excessively bouncy. Does the use of adhesive contribute to the stiffness of an I-joist floor system? Would it help to add midspan blocking? More

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Exposed I-Joists

Q: A client has asked me to build a practical outbuilding with a wood floor system. For simplicity's sake, I'd like to place it on a Sonotube foundation and use continuous-span wood I-joists. The bottom of the I-joists will be about 16 to 24 inches off the ground, and the perimeter joists will be completely protected from the weather by the siding and water table. Is it okay to use I-joists in this situation? 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

Framing an Elliptical Staircase
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Framing an Elliptical Staircase

Recently, my friend Nick Ridge and I took on a job in Northern California that had... More

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