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Old 10-20-2010, 03:02 PM   #1
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Default Insulation for Under my Brew House?

My brew house is about 200 sq ft on the floor and up on pilings. I need to insulate underneath as there is currently nothing there. The guy I bought my house from built this as a taxidermy shop and for some reason didn't go through the trouble. The walls and ceiling are insulated.

I've been doing some online research and there are lots of different recommendations. I thought some of the contractor type people here might have an answer.

This was the most involved I've found.
1) staple a vapor barrier btwn the joists.
2) push R18 un-backed insulation btwn the joists
3) cut 2" Pink foam board and place snug between the joists
4) use furring strips to hold in place
5) cover entire area with 1/4" wire mesh.

This was the easiest I've found:
1) Push R18 Backed insulation (with the backing toward (also read away) from the floor)
2) Hold in place with furring strips.

How serious should I go here? Do I use Backed or Un backed insulation? Which way should it face? There are so many conflicting opinions out there.

Thanks!
-Karl


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Old 10-20-2010, 03:07 PM   #2
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I'd pull the floor, stuff the soft stuff down between the joists proper side up, nail flooring back down. I am not a contractor


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Old 10-20-2010, 03:19 PM   #3
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Floor is already down and tiled...I did that all last October.

I can access underneath by crawling under the brewery since it is up on pilings. It's definitely going to be messy, but I'll fit. I'm just confused as to using backed/un-backed and what orientation (up or down) it needs to face.
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Old 10-20-2010, 03:23 PM   #4
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Here is a photo of the brew house....

http://www.homebrewtalk.com/gallery/...9&limit=recent

the back side is significantly higher off the ground allowing easier access. After I get the insulation installed I plan on putting lattice around the bottom to cut down on the wind blowing through and attempt to keep the ground hogs out. =)
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Old 10-20-2010, 03:23 PM   #5
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Shouldn't the insulation tell you? I'd imagine it'd be printed on the actual paper backing as to which side should be up.
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Old 10-20-2010, 03:26 PM   #6
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why not spray in insulation, You could spray in foam or cellulose. This way you wouldnt have to rip open the walls.
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Old 10-20-2010, 03:33 PM   #7
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It doesn't really deal with buildings up on pilings. It specifies paper up (or towards floor) for "vented crawl spaces" but I don't know how this applies to my situation. I know it has to do with vapor transmission and air flow. One site even recommended unbacked and then poly sheeting stapled to the joists. It seems there are many ways to skin this cat, just trying to make sense of it all.
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Old 10-20-2010, 03:36 PM   #8
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Quote:
Originally Posted by JewBrew View Post
why not spray in insulation, You could spray in foam or cellulose. This way you wouldnt have to rip open the walls.
The cellulose stuff I saw is not designed to "stick". It's more for attics.

I just need to do the floor from underneath so i need a way to attach it. I could use a spray foam, but I believe this is pretty costly and would probably have to pay someone to come in with the machine.
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Old 10-20-2010, 03:38 PM   #9
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From what I have read, the vapor barier should face the heated space otherwise, condesation can occur within the insulation and rot the structure.

I did a similar thing under an addition on my house. I stapled plastic between the floor joists and to the underside of the subfloor. I then used unfaced insulation between the joists and 2-in rigid foam nailed to the bottom of the joists.
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Old 10-20-2010, 03:45 PM   #10
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Quote:
Originally Posted by lschiavo View Post
From what I have read, the vapor barier should face the heated space otherwise, condesation can occur within the insulation and rot the structure.
...
That is right on the money. The vapor barrier must be installed facing the conditioned space.


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