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Old 10-20-2010, 03:55 PM   #11
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Ischiavo, Did you also staple more plastic over the rigid foam or just left the foam exposed? It sounds like nailing these in place held the insulation and you didn't need furring strips.

Also, if I use the backed insulation (against the heated space) could I skip stapling plastic first since the backing acts as the vapor barrier?

Thanks for your help guys!

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Old 10-20-2010, 04:05 PM   #12
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Originally Posted by BentTwigBrew View Post
Ischiavo, Did you also staple more plastic over the rigid foam or just left the foam exposed? It sounds like nailing these in place held the insulation and you didn't need furring strips.

Also, if I use the backed insulation (against the heated space) could I skip stapling plastic first since the backing acts as the vapor barrier?

Thanks for your help guys!
I only used the plastic against the subfloor. You dont want a double vapor barrier. I used unfaced insulation because I happened to have it. I held it in place temporarily with drywall tape stapled across the joists until I added the rigid foam.

I am sure a backed insulation would work just as well. You may want to add some covering (screen) over the foam to protect from rodents if you think this may be an issue. I haven't gotten that far yet.

Have fun! Insulating has always been a joy for me (read the sarcasim). It is especially enjoyable laying on your back in the dirt
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Old 10-20-2010, 04:12 PM   #13
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I recently insulated my crawlspace and wanted to confirm the vapor barrier toward the floor. I would skip the plastic; the rigid foam will act as another vapor barrier - be sure to seal those joints to achieve the barrier.

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Old 10-20-2010, 04:19 PM   #14
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Roger that

1)Backed insulation with backing towards the subfloor between the joists.
2)Rigid foam (pink stuff) between the joists
3)Sealed joints in foam to achieve the barrier
4)Screen over foam to keep critters out.
5)Drink lots of homebrew cause this project will suck...

All in favor?

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Old 10-20-2010, 04:28 PM   #15
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I'd at least get an estimate for having someone spray in the insulation and then proceed to step#5 and watch them do it. Times are tough and someone just might want to fill in a day with a quicky job - maybe the promise of 5 gallons of homebrew to sweeten the deal.

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Old 10-20-2010, 04:44 PM   #16
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Roger that

1)Backed insulation with backing towards the subfloor between the joists.

2)Rigid foam (pink stuff) between the joists
I fastened the foam to the bottom of the joists with the long washer nails. I did not cut it to fit between the joists. This may not work in your situation but will save a lot of cutting if it does.

3)Sealed joints in foam to achieve the barrier
I dont think this is desired as the vapor barrier is against the subfloor. You want your fiberglass to be able to breathe a bit.

4)Screen over foam to keep critters out.
5)Drink lots of homebrew cause this project will suck...
Correct!

All in favor?
*
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Old 10-20-2010, 06:51 PM   #17
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I'd at least get an estimate for having someone spray in the insulation and then proceed to step#5 and watch them do it. Times are tough and someone just might want to fill in a day with a quicky job - maybe the promise of 5 gallons of homebrew to sweeten the deal.
I just got a quote from 1 guy. He wants $1500 for the job! I could get the material (for 3" of closed cell foam) and spray kit for about $610 + shipping and do it myself.

https://www.sprayfoamdirect.com/products/component/page,shop.product_details/flypage,shop.flypage/product_id,18/category_id,6/manufacturer_id,0/option,com_virtuemart/Itemid,1/

http://www.betterenergystore.com/productpage.asp?p=4

If I did only 1" thick I could do it for about $330 but that is only R7. I requested some other quotes...we'll see what comes back.

I think fiberglass is significantly cheaper...I'm not sure if it even makes sense to spray foam the bottom of the brew house if the rest is normal fiberglass insulation.
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Old 10-20-2010, 08:24 PM   #18
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If it were me, I'd do 1/2" rigid foam under the subfloor OR staple 6mil plastic between joists as vapor barrier. Absolutely the vapor barrier faces the conditioned space in the North states. Fill the whole cavity with unfaced fiberglass, use those push in wires to hold it up (they are like 15" long and have to jam between the 16 o.c. joists. Finish off by stapling a full piece of wiremesh.

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Old 10-20-2010, 08:39 PM   #19
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Bobby M to the rescue =)

I have a HUGE roll of Military grade vapor barrier that we were throwing out @ work. I rescued it. I can use that btwn the joists then use unfaced fiberblass with the pins and follow with the wiremesh. This sounds like the most cost effective way to get this done.

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Old 10-20-2010, 09:43 PM   #20
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You seriously need to consider putting something solid or at least critter-proof to protect the insulation. I have a crawl space and insulated with 6" batts. There's a nice layer of shredded pink all over under the house. Rodents love the stuff.

And Boss loves rodents. Got 5 ground squirrels this year.

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