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Old 08-29-2015, 09:31 AM   #1
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Caulking between osb and concrete foundation


I have a small gap as you can see between my wall osb that drops down past my rim board and is next to the foundation wall. I'm wanting to know if I should caulk this gap all around the bottom of the osb before house wrap and siding. Any reason not to?
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Old 08-29-2015, 05:28 PM   #2
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can't hurt - use 100% silicone OR sikaflex 2c ns (non-sag),,, i'd probably not do the same AFTER house wrap & siding as, if anything gets behind the wrap/siding, it'll be trapped

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Old 08-29-2015, 07:19 PM   #3
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My vote is let it be. Osb and cement should not be touching each other so for me leave the air gap. Ron
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Old 08-29-2015, 11:59 PM   #4
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Ront, how would using caulking change that?

I know to leave a gap for moisture to exit behind the siding and house wrap. My concern is with air sealing and bugs entering the house through this gap. It's not a problem now, but I want to seal it up if it's normally done on new houses. If it's left the way it's shown in the photo I will not worry about it.
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Old 08-30-2015, 10:45 PM   #5
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Quote:
Originally Posted by AlphaPilot View Post
Ront, how would using caulking change that?

I know to leave a gap for moisture to exit behind the siding and house wrap. My concern is with air sealing and bugs entering the house through this gap. It's not a problem now, but I want to seal it up if it's normally done on new houses. If it's left the way it's shown in the photo I will not worry about it.

did you use sil gasket under the mud sil before you put your rim joist on.. that will compress into the concrete and will createa seal
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Old 08-31-2015, 01:19 AM   #6
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For that gap I would recommend using backer rod and a high quality caulk as "stadry" mentioned. Put plenty of caulk into the area first then push the backer rod up into the gap. I would allow that to dry at least an hour then finish caulking it all up. One advantage of spending the time to do this would be to prevent the invasion of bugs you would not want.
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Old 08-31-2015, 09:22 AM   #7
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Yes, Seal Siller was used but that is not perfect and the concrete has to be smooth for that to be fullproof which is not the case in most jobs. The sill plate is pressure treated and that causes it to not be perfectly straight or true. I just wanted to make sure this was not a gap that needed left alone. I didn't see any reason, but I have been known to be wrong! I will look up a silicone that I can purchase. Should I be concerned about finding a caulking made for bonding to concrete also, or just a silicone?
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Old 08-31-2015, 11:29 AM   #8
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is that the bottom edge parallel to the ground? if so i would J channel it with some aluminum, then silicone the gap as needed.
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Old 08-31-2015, 05:41 PM   #9
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Can't locally rent a brake, small town businesses only. I don't want to hire it out for $400 total when it looks to me like $30 in silicone would do the trick since it's not going to be exposed to sun or moisture especially once siding is installed.
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Old 08-31-2015, 08:04 PM   #10
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you buy J channel already done, no need for a brake.
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Old 09-01-2015, 08:50 AM   #11
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How would J-Channel fill that gap? It would wrap the bottom of the OSB? I don't think I want the bottom edge of the OSB wrapped since it needs to breathe and dry.
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Old 09-01-2015, 09:28 AM   #12
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Originally Posted by AlphaPilot View Post
How would J-Channel fill that gap? It would wrap the bottom of the OSB? I don't think I want the bottom edge of the OSB wrapped since it needs to breathe and dry.
quite the opposite. OSB exposed to the weather will cause it to eventually rot. if you want it to breath you can add some 1/8" hole every 24".

the J channel doesnt fill the gap, it protects the wood. then caulking it is easier.
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Old 09-01-2015, 03:27 PM   #13
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Is that standard practice, then? The J-Channel for bottom edge of OSB?

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