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howard.wheaton 10-19-2008 06:57 PM

Crawl space insulation
 
Does anyone know anything about the Reflectix insulation. It is a double layer of trapped air bubbles between foil facings. I am looking to install insulation on the walls of my crawl space and just saw this at Menards. I will leaning towards the fiberglass, but then you have the issue of mildew if it gets wet.
Thanks

Wildie 10-19-2008 07:45 PM

I insulated my crawl space with ROXUL insulation.
Its made from melted rock that is spun and formed into bats.
Fibreglass is usually rated at R12 per 3 1/2". Roxul is R13.
The advantage of Roxul is that doesn't absorb moisture and has a fire rating!

i fastened mine to the masonry with pins that are glued onto the wall.

Here's a link! http://www.roxul.com/sw34086.asp

Winchester 10-20-2008 12:05 PM

Foamboard was reccomended to me by our energy auditor.

Illinois recommends an R-Value of 25 in crawl spaces.

In my readings, crawl space walls are only insulated if the crawl space is unvented and the floor above the crawl space is uninsulated.

jerryh3 10-20-2008 12:16 PM

Quote:

Originally Posted by Winchester (Post 174323)
Foamboard was reccomended to me by our energy auditor.

Illinois recommends an R-Value of 25 in crawl spaces.

In my readings, crawl space walls are only insulated if the crawl space is unvented and the floor above the crawl space is uninsulated.

Was R-25 recommended for the floor or for the crawlspace walls?

Winchester 10-20-2008 07:40 PM

Quote:

Originally Posted by jerryh3 (Post 174332)
Was R-25 recommended for the floor or for the crawlspace walls?

That would be walls as per the OP original intentions.

jerryh3 10-21-2008 06:37 AM

Quote:

Originally Posted by Winchester (Post 174501)
That would be walls as per the OP original intentions.

Just asking because R-25 seems high for a crawlspace wall.

Wildie 10-21-2008 05:19 PM

Quote:

Originally Posted by jerryh3 (Post 174665)
Just asking because R-25 seems high for a crawlspace wall.

If you have enough space, the more insulation the better. The question being whether its cost effective.
In northern areas wall framing is now standardized at 5 1/2 in. to allow for additional insulation. (R20).
R25 would only be a couple more inches, and the extra cost payback would be quick!

jerryh3 10-21-2008 06:15 PM

Quote:

Originally Posted by Wildie (Post 174898)
If you have enough space, the more insulation the better. The question being whether its cost effective.
In northern areas wall framing is now standardized at 5 1/2 in. to allow for additional insulation. (R20).
R25 would only be a couple more inches, and the extra cost payback would be quick!

Where are you that walls are standardized to 5.5?

Wildie 10-21-2008 07:25 PM

Quote:

Originally Posted by jerryh3 (Post 174907)
Where are you that walls are standardized to 5.5?

What are known as 2X6's are really 1 1/2 X 5 1/2 in size.
I'm in Canada and its considered wise to use 2X6 wall studs to allow for extra insulation.
I do assume that the northern US states would do so, also!

It would likely be a good idea to use them in the south to reduce cooling costs, also.

jerryh3 10-21-2008 07:54 PM

Quote:

Originally Posted by Wildie (Post 174944)
What are known as 2X6's are really 1 1/2 X 5 1/2 in size.
I'm in Canada and its considered wise to use 2X6 wall studs to allow for extra insulation.
I do assume that the northern US states would do so, also!

It would likely be a good idea to use them in the south to reduce cooling costs, also.

Oh. That north. I agree about the 2X6's.

Wildie 10-21-2008 10:41 PM

Quote:

Originally Posted by jerryh3 (Post 174955)
Oh. That north. I agree about the 2X6's.

:laughing:


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