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Floor Joist Repair/Bridging


Chacho's Avatar
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Join Date: Apr 2012
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05-21-12, 04:44 PM   #1  
Floor Joist Repair/Bridging

This is probably a simple question and I'm probably being way too conservative by asking, but I hate doing things wrong or twice. I'm working on sistering some joists in my basement. The joists are 2"x10" with a 14' span. I'm planning on sistering the entire length. Originally there was wood cross bridging in place at about 1/3 down the joist. I plan on using 2x10 solid bridging. I think code is to bridge every 8', but I thought I would bridge at the 1/3 and 2/3 mark. I've tried to research and have gotten conflicting information. Should the bridging be installed perpendicular to the joists, toenailed so they are perfectly lined up with one another? I've seen totally staggered on some sites and I've seen partially staggered on this site.

Solid Bridging | DoItYourself.com

Ease of installation is also a concern of mine...but I want to do it right.

Also, when I sister and fasten the joists together, I plan on using through bolts (probably 1/2"). Should the bolts be fastened in a 'W' pattern or a vertical line? How far away should the bolts be placed from one another? How far should they be from the edges?

Any info would be great. Thanks.

 
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Chacho's Avatar
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05-21-12, 05:12 PM   #3  
Thanks for the link. Definitely informative. Any suggestion on the bolt pattern to fasten the sistered joists to each other? Does it really matter much?

 
XSleeper's Avatar
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05-21-12, 05:26 PM   #4  
I would not bolt since holes in the middle 1/3 of a joist will weaken it. I would lay a wild bead of construction adhesive between the joists and then just nail with framing nails. Sets of 3 or 4.... 16" on center. That will be sufficient. Also apply construction adhesive to the subfloor as you roll the sistering joist into place.

Keep in mind that you may need to temporarily jack the original joist straight as you sister them together. An engineered LVL will be superior in strength to dimensional lumber and might be advisable, especially if you add the added stress of jacking up a bowed joist to the new sistered joist.

 
Chacho's Avatar
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05-22-12, 04:11 AM   #5  
I did notice some slight cupping or warping on a couple of the old joists. I guess that is why I was considering using a through bolt. Should I not be concerned about completely sucking the sistered joists together, or will just a healthy anount glue and nails be adequate? There is alot of conflicting information out there from nails, to deck screws, to lag screws, to through bolts...not to speak of the pattern of the fasteners. Seems there are some pretty knowledgable people here, so I appreciate the help/info.

 
BridgeMan45's Avatar
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05-23-12, 12:50 PM   #6  
What is the reason for sistering additional joists in the first place?

 
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