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Rim joist as form board


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Brian's Forum Posts: 2
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By Brian in Roseville, CA on 4/18/2007


Sorry if this has been asked and answered.  (I tried searching to no avail.)

I see StrongTie has wedge-tie anchors sized for 1 1/4-inch engineered-form lumber. strongtie.com/products

I need to form a stem wall up to 4' in height. I could do the forming in a number of ways, including good old-fashioned 2x10 with wedge-tie anchors. And I know that there is engineered lumber specifically for use in concrete forming. 

But since this is a one-time pour, I was wondering if I could use my 11 7/8"x1 1/4" rim joist (that I will need later anyway). Of course, you wouldn't want to contaminate it with diesel fuel (as form release) and you would need to strip the forms quickly and clean them up very nicely. 

Is there any reason not to do this? 

Thanks,

Brian

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By Junior in Greensboro, NC on 6/21/2010


Why not use some type of plastic or paper for the release, so the concrete never touches the wood?

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By Rich in Suffolk, VA on 4/16/2011


I'm doing this myself. I have a second floor that uses 2x10 joists, so I went ahead and purchased those early enough to be used as formboards for my slab. There are some risks/disadvantages. One is that some locales have inspectors who will reject the used boards if they can't clearly make out the rating that was once imprinted on the side.

Also, using the boards for concrete will mean that, even with form release, the board will have concrete/sand stuck to it which will wear out saw blades faster. I cut some boards that had sand on them and have already noticed that. I plan on changing all of my saw blades after the framing process, so this won't be as big an issue for me. During framing you don't need pretty cuts like you would want for trim anyway.

As for release, there are now non-petroleum form release products. I couldn't find any without paying expensive shipping, so I just paid my concrete crew an additional $50 to spray my boards. I used the non-petroleum product to protect my well, which is only 30' away from the foundation.

I have heard of individuals using plastic as form release, but I haven't tried it myself.

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