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-   -   What is this crossbracing on my floor joists? (http://www.diychatroom.com/f19/what-crossbracing-my-floor-joists-158355/)

huesmann 09-29-2012 09:00 AM

What is this crossbracing on my floor joists?
 
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Just wondering what purpose this serves (see attached photo). It's about 7' from the wall only on one side of the house.

Ed911 09-29-2012 09:48 AM

Check out this website, it pretty much explains all you need to know about cross bracing.

http://www.homeadditionplus.com/fram...oor_Joists.htm

hand drive 09-29-2012 11:38 AM

If needed now a days we add blocking mid span of the floor joists instead of the cross type bracing. It keeps the joists from twisting and moving over time.

woodworkbykirk 09-29-2012 12:46 PM

x bracing adds much more strength to the floor as compared to blocking. also x bracing completely block off the joist spacing in case plumbing or electrical needs to be run.. no drillinng or notching required

Gary in WA 09-29-2012 06:31 PM

Only if a 1x4 or ceiling ties them together underneath.

Apples to apples, the solid blocking is 66% stiffer than x-bracing, add the 1x4 to the bottom= 167% less deflection; http://www.ewpa.com/Archive/2004/jun/Paper_278.pdf

Gary


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