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Old 11-17-2014, 09:10 AM   #16
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Anything that is compliant with the foam is fine.
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Old 11-17-2014, 09:10 AM   #17
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I just want to make sure the Roxul will satisfy any ignition barrier issues. Also, do I use the XPS + Roxul in EVERY place I used fiberglass before?

For example behind the heating ducts. Does the Foam touch the ducts where the fiberglass used to be? Or do I cut the rigid foam and give some space for the hearing ducts?

I guess these are all part of the fire code questions.
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Old 11-17-2014, 09:11 AM   #18
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Quote:
Originally Posted by Windows on Wash View Post
Anything that is compliant with the foam is fine.
Do you know if Roxul is compliant w the foam? Thanks!
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Old 11-17-2014, 09:23 AM   #19
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Quote:
Originally Posted by cjaustin81 View Post
Do you know if Roxul is compliant w the foam? Thanks!
The Roxul won't eat the foam or vise versa.

Use Roxul against the duct work. It won't melt.
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Old 11-17-2014, 09:26 AM   #20
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Another question is the area by the electrical box. There was insulation on the wood before I removed the fiberglass. Do I have to be careful w the XPS + Roxul near the electrical box?

Safe to replace the fb above the box with XPS + Roxul?

Last edited by cjaustin81; 11-17-2014 at 09:51 AM.
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Old 11-17-2014, 09:40 AM   #21
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Quote:
Originally Posted by 123pugsy View Post
The Roxul won't eat the foam or vise versa.

Use Roxul against the duct work. It won't melt.
Is it ok to use the XPS behind the ductwork as long as the Roxul
is in front and touching the duct?

In spots like this should I use XPS + RoxuL?







Or do I want to avoid using XPS entirely in those sections (sides of basement) where the ductwork is?

Last edited by cjaustin81; 11-17-2014 at 09:51 AM.
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Old 11-17-2014, 10:18 AM   #22
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If you can get to it, yes.
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Old 11-17-2014, 11:36 AM   #23
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Quote:
Originally Posted by Windows on Wash View Post
If you can get to it, yes.
If I can't get XPS + Roxul in there would u recommend I just use Roxul only
or fiberglass only?
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Old 11-17-2014, 11:44 AM   #24
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Quote:
Originally Posted by cjaustin81 View Post
If I can't get XPS + Roxul in there would u recommend I just use Roxul only
or fiberglass only?
The only choice left, so go for it.
Go with the Roxul. Great stuff.
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Old 11-17-2014, 11:48 AM   #25
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The only choice left, so go for it.
Go with the Roxul. Great stuff.
So go w XPS + Roxul in the areas I can fit it, and the tight spaces that
won't allow both I should just use a Roxul by itself?

I'm going to b putting the XPS right up against the wood rim joist. Same w
the Rolux, I'm hoping I don't need an additional barrier material
to be attached to the wood initially.
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Old 11-17-2014, 12:44 PM   #26
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Just got off the phone w the village building director and she
said since this is the basement (100% underground) that the R
requirements are 10/13. That I will meet the R requirement w just the 2"
XPS foam. She also told me NOT to use any vapor barriers.

As far as the fire codes, she wasn't sure if the XPS has to be covered
for residential applications. She's going to check and call me back.

I always thought for the rim joist it was the wooden wall R rating (20 for area 5)
but she said it's only R10 for a rim joist.
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Old 11-17-2014, 01:00 PM   #27
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Update:

They said I need to cover any exposed rigid foam to meet code.

Roxul will meet this requirement so I'll just add Roxul to every
Place I add rigid foam XPS.
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Old 11-17-2014, 01:16 PM   #28
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For the sealant, what caulk is best?

I bought some cheap acrylic caulk, would silicone be better?
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Old 11-17-2014, 01:59 PM   #29
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This is the caulk I bought >

http://www.dap.com/product_details.a...=12&SubcatID=3

DAP® ALEX PLUS® Acrylic Latex Caulk Plus Silicone
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Old 11-17-2014, 02:32 PM   #30
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That caulk looks fine.
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