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Old 12-08-2011, 09:17 AM   #1
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Curved form for concrete footing


I am attempting to create a curved form for a concrete footing. I am not having much luck. I cut a series of kerfs on the back of the wood that will be used for the forms, but when I try to bend the wood it sometimes breaks at the kerfs. I need some tips on how deep to make the kerfs and how far apart they should be, and also what type / size (thickness) wood to use. The footing will be used to support standard CMU's, the radius is approx 20', the length is approx 25'.

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Old 12-08-2011, 09:20 AM   #2
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Curved form for concrete footing


You don't kerf wood, you use a piece of primed fiberboard siding. It will bend almost as tight as you would need in most cases. If the radius is really tight use multiple layers of 1/8" panelling or 1/4" plywood.

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Old 12-08-2011, 09:21 AM   #3
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Curved form for concrete footing


Ayuh,... We use luan, or sheet steel, with extra pinnin'....
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Old 12-08-2011, 05:51 PM   #4
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Curved form for concrete footing


For a 20' radius, a 1x8 should bend just fine, it's not that tight. If you think it's going to break, get them wet for a few hours before hand.

Primed 1/2" masonite siding works well also, but I wouldn't personally use it unless the radius was under 10'.
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