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Old 05-03-2019, 09:54 PM   #1
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quick question - sealing rim joist and sill stack


i was in the process of sealing the rim joist with 3" and foam but then noticed three stack sill.



in second pic you can see the pressure treated sill sitting on top of gasket/foam and then three stack wood. how do i insulate this area?



do i grout the seak and in between the stack?


<blockquote class="imgur-embed-pub" lang="en" data-id="a/q0UmaQ9"><a href="//imgur.com/q0UmaQ9">Sealing the rim joist and the 3 stack sill</a></blockquote><script async src="//s.imgur.com/min/embed.js" charset="utf-8"></script>
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Old 05-03-2019, 10:14 PM   #2
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Re: quick question - sealing rim joist and sill stack


pics

https://imgur.com/a/q0UmaQ9
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Old 05-03-2019, 10:21 PM   #3
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Re: quick question - sealing rim joist and sill stack


Just like the rest, when or if you build a wall in front of this the top plate of the wall is extra wide so it reaches all the way in and touched the top one and when you insulate the wall, all is covered.
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Old 05-03-2019, 10:27 PM   #4
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Re: quick question - sealing rim joist and sill stack


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Originally Posted by Nealtw View Post
Just like the rest, when or if you build a wall in front of this the top plate of the wall is extra wide so it reaches all the way in and touched the top one and when you insulate the wall, all is covered.

i did not understand word you said, i am sorry.

so when i insulate the joist area do i leave the sill alone? people keep saying
seal around the foam gasket where the sill sits on but i got 4 of them. how do i insulate that area?



i do have dry wall and it stops 90 degrees to the first wood.
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Old 05-03-2019, 10:53 PM   #5
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Re: quick question - sealing rim joist and sill stack


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Originally Posted by jackallis View Post
i did not understand word you said, i am sorry.

so when i insulate the joist area do i leave the sill alone? people keep saying
seal around the foam gasket where the sill sits on but i got 4 of them. how do i insulate that area?



i do have dry wall and it stops 90 degrees to the first wood.
This is what it would look like in a finished basement from the sides with a wall built in front of the concrete wall, If you want to bring foam all the way down to cover those plates and cover that with drywall, like the first picture, it won't hurt anything.
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Old 05-10-2019, 07:55 AM   #6
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I would caulk the seams between the sill plates and cut and glue rigid foam over them. Then spray foam any gaps.
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Old 05-10-2019, 11:23 AM   #7
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Re: quick question - sealing rim joist and sill stack


No fiberglass against any cold surface as air will get through and form condensation.
Emphasis on sealing any air leaks, I like the caulk suggestion, as a small leak will defeat a lot of rigid insulation and effort.

Keep in mind that insects and critters will use any cavities or paths you create.

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Old 06-10-2019, 10:13 AM   #8
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Re: quick question - sealing rim joist and sill stack


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Originally Posted by schreibdave View Post
I would caulk the seams between the sill plates and cut and glue rigid foam over them. Then spray foam any gaps.
what kind of rigid foam should I use? pink/blue/faced/unfaced?
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