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Old 01-10-2012, 09:23 PM   #1
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Spray foam rim joist


Next phase of the basement project. I'm getting spray foam applied to the rim joists. The sill plate is pressure treated wood, pretty much wrapped in the tyvek and sitting on the sill gasket, on top of the poured walls. Rigid foam board has been put on the foundation walls and goes up even with the top of the walls.

My question is, do I just spray right over the tyvek on the sill plate and just seal everything or do I need to clear that off the sill plate. My limited knowledge would tell me to seal it all in as is.

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Old 01-10-2012, 09:32 PM   #2
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Spray foam rim joist


I can think of no reason why there's even Tyvec there in the first place.
It should have been on the outside over the sheathing not under the house.

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Old 01-10-2012, 09:35 PM   #3
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?

Joe, you got me cracking up laughing. Thanx.

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Old 01-10-2012, 09:39 PM   #4
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The tyvec is on the outside over the sheathing and comes down and wraps around under the sill plate.
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Old 01-10-2012, 09:55 PM   #5
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Spray foam rim joist


Quote:
Originally Posted by Jeff0101
The tyvec is on the outside over the sheathing and comes down and wraps around under the sill plate.
Tis better to let it hang down a little, if possible.

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Old 01-10-2012, 09:56 PM   #6
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Spray foam rim joist


Usually the tyvec does not wrap under the bottom of the sill plate.
Could you post some pictures that may help.
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Old 01-10-2012, 10:00 PM   #7
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Spray foam rim joist


In order to have done that someone would have had to install it over the foundation, installed the sill seal, the mud sill, set the wall then flip it up over the wall.
Not likly.
Just cut it out of the way.
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Old 01-10-2012, 10:12 PM   #8
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Spray foam rim joist


That's what I was thinking so I wonder if what he describes and how I understand it is what it really is.
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Old 01-10-2012, 10:18 PM   #9
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Spray foam rim joist


i bet its something goofy like a builder wrapping the sill plate (before installation) in tyvek thinking it offers some type of added protection. like saran wrap.

people do weird things.
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Old 01-11-2012, 06:29 AM   #10
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Picture attached (I think). I is stapled on to the PT board. It will be a pain to rip off.
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Old 01-11-2012, 07:15 AM   #11
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Spray foam rim joist


Just go along with a really sharp long bladed knife and slice off, or roll down and staple to the plate. As for the spaces, depending on costs, some just place 2" to 4" of foam board in the space and caulk or DAP foam the gap to help seal.

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