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Old 01-07-2010, 01:40 PM   #1
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How to Attatch 2x4 to Floor Joist


I've got a bouncy living room floor (2x8x14'6" floor joists on 1' centers). Among other things (blocking, sistering joists, etc) one of the things I want to do is attach 2x4s to the underside of the existing joists to effectively converting the joists to up-side-down T beams.

The question is how to attach the 2x4 to the joists such that I can safely support future loads on them (such as sheet-rock ceiling and framing for soffits to hide air ducts)?

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Old 01-07-2010, 03:21 PM   #2
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How to Attatch 2x4 to Floor Joist


sister the existing joists with another 2 x 8 would be stiffer (imho) than adding the 2x4 as an inverted 't'. also, you are missing the top chord so it might not work as effectively.

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Old 01-07-2010, 03:55 PM   #3
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How to Attatch 2x4 to Floor Joist


I have already sistered every third joist with another 2x10.

For weight and cost reasons, I don't want to sister EVERY joist.

Creating the inverted 't' is just a way to add a little more strenght for relatively little more weight.
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