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Old 01-23-2012, 07:50 PM   #61
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Originally Posted by GBR in WA View Post
The plastic alone is fine on the walls unless it is a conditioned crawlspace. You want conditioned if the HVAC ducts are down there. To condition---- insulate the walls, otherwise, insulate the floor. I would mastic or asphalt emulsion the plastic as it has to be air tight. You will still have problems with the joists getting wet from any other moisture source under there, along with radiation because the walls are not insulated, only plastic covered, leaving a cold crawlspace:


Gary

But is it wise to do both? Cover the walls with plastic, then put rigid foam board on top of the plastic.

If yes, why couldn't I just use something like Dow's Thermax which is a glass-fiber-reinforced polyisocyanurate insulation board with a foil covering? Foil for the air seal and the core for insulation.

That is the question I have been trying to get answered.

Update: I found this at Dow. http://msdssearch.dow.com/PublishedL...romPage=GetDoc

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Old 01-23-2012, 10:51 PM   #62
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Sorry, I guess I made it confusing to understand.

NO plastic if using foamboard.

Tape to joints with foil tape. Check with local AHJ for air exchanges.

Gary
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Old 01-24-2012, 10:31 AM   #63
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AGW,

From your experience and educational background, do you advocate installing polyethylene film (6 mil plastic) from ground level all the up (in my case to within 3 inches of the rim joist) block crawlspace walls?

Also, if insulating a block crawlspace wall, would you specify extruded polystyrene (XPS) rigid foam board or foil faced polyisocyanurate foam board?

I understand local code is the final word but just interested in your point of view.
I'd recommend either the plastic or the XPS foam, depending on your budget. There is no need to use both.
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Old 01-24-2012, 12:06 PM   #64
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Thank you for the reply Gary and AG.
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Old 01-24-2012, 03:14 PM   #65
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Thank you for the reply Gary and AG.
What...I get no love
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Old 01-24-2012, 11:35 PM   #66
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Well, I've been home sick for 3 days, and I answered one right, and got a thanks! I'm feeling pretty good, I'll give you one of mine; take your right hand, reach over the left shoulder........
I'm staying out of the staff break room, think I picked up a virus there...

Gary

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Old 01-25-2012, 10:19 AM   #67
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Hey, I gave you one in post 50. But it I can make your day better ............

Thank you Wash for your helpful replies to my questions.
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Old 01-25-2012, 05:33 PM   #68
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Hey, I gave you one in post 50. But it I can make your day better ............

Thank you Wash for your helpful replies to my questions.
I'll take it.

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