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Old 04-28-2012, 10:03 PM   #1
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How to seal openings in rim joist


Hi guys. While running power to a shed, I ran my conduit out the rim joist of the house and down the foundation wall. Now I'm just trying to figure out what the best way is to seal around the conduit where it passes through my rim joist. If it makes any difference, it's actually also passing through a ledger board for my deck, which is bolted to the rim joist. Here's a pic. In its installed position, the LB fitting in the picture is pushed flush against the ledger board, so the opening around the conduit isn't as large as it appears here.



So what would be the best option for sealing around that conduit? I picked up a can of that Great Stuff fireblock expanding foam, but wasn't sure if simple silicone caulk would be a better choice, or something else I haven't thought of. Any input? Thanks!

Dan

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Old 04-28-2012, 10:14 PM   #2
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How to seal openings in rim joist


Expanding foam would end up just maiking a mess. Silicone will work fine.

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Old 04-29-2012, 01:40 PM   #3
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How to seal openings in rim joist


spray foam on the inside to stop drafts. then try and find a trim ring for the outside
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Old 05-02-2012, 09:51 AM   #4
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How to seal openings in rim joist


Thanks, guys. I'll use caulk on the outside and maybe spray foam on the inside if it seems necessary.

Dan
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Old 05-02-2012, 01:31 PM   #5
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How to seal openings in rim joist


spray foam then trim back the extra that pushes out. After looking at it it is electrical fire block foam. It will out last your home.

Last edited by Nailbags; 05-02-2012 at 01:33 PM.
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Old 06-24-2012, 06:42 PM   #6
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How to seal openings in rim joist


On the inside of the house is the plastic conduit that goes thru the rim joist going into a metal junction box? If so what type of fitting did you use to transition from the plastic conduit to the metal box?
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Old 06-24-2012, 07:36 PM   #7
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On the inside of the house is the plastic conduit that goes thru the rim joist going into a metal junction box? If so what type of fitting did you use to transition from the plastic conduit to the metal box?
It mates with a PVC junction box, and that's where I spliced from the THWN to the Romex 6/3, which exits the box with a romex clamp.





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Old 06-24-2012, 10:59 PM   #8
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How to seal openings in rim joist


Get rid of the LB and mount a box on the wall instead.

The LB looks not good.

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Old 06-25-2012, 07:02 AM   #9
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It mates with a PVC junction box, and that's where I spliced from the THWN to the Romex 6/3, which exits the box with a romex clamp.
Dan
Thanks and the LB looks fine.
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Old 06-25-2012, 07:55 AM   #10
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How to seal openings in rim joist


Use the DAP foam, not the Great stuff. DAP can be cleaned up with water if you make a mess. Just do not use it around copper piping, since the copper will react with it, when it touches the surface of the pipe.

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