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Old 12-31-2012, 04:49 PM   #1
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Seeking Suitability for DryRight Insulation in basement


Hi All,

I'm getting ready to finish the basement in our home. Not sure what all of the pertinent information regarding our home is, but here's a start: The home is located in St. Louis, MO. The home was constructed in 2008. The basement was built on a 9 foot poured concrete walls.

I had all but decided to use the building science approach on the walls. Then my father spoke to a represatitive at a local insulation company. He recommened a product called DryRight Insulation, by CertainTeed. http://www.certainteed.com/products/...ulation/317360.

Essentially the product appears to have a membrane that allows the concrete wall to dry. Seems like the claimed performance would make it ideal for the basement. I'm looking for feedback on whether or not this product would be suitable for my basement or if I should just stick 2" XPS + unfaced batts? And also for what reasons one would avoid or use this product?

Thanks,
Matt
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Old 01-01-2013, 01:24 AM   #2
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Seeking Suitability for DryRight Insulation in basement


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Originally Posted by mklein49 View Post
Hi All,

... or if I should just stick 2" XPS + unfaced batts? And also for what reasons one would avoid or use this product?

Thanks,
Matt
I am not familiar w/ the product, but Membrain is apparently a read good product. Myself, I will never again touch fiberglass, Membrain or not. Since using the product may be an expensive experiment, I'd stick w/ 2" EPS, taped, and rock wool batts in the (assumed) wall you'll build inside the foam.
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Old 01-01-2013, 08:34 AM   #3
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Seeking Suitability for DryRight Insulation in basement


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Originally Posted by jklingel View Post
I am not familiar w/ the product, but Membrain is apparently a read good product. Myself, I will never again touch fiberglass, Membrain or not. Since using the product may be an expensive experiment, I'd stick w/ 2" EPS, taped, and rock wool batts in the (assumed) wall you'll build inside the foam.
Correct...I plan to build a 2x4 perimeter wall with the unfaced batts installed in the wall cavity.

Thanks for the response!
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Old 01-02-2013, 09:05 PM   #4
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Seeking Suitability for DryRight Insulation in basement


That "Membrain" product is on the f.g. batt face. To stop condensation on the concrete walls- needs an insulating sheathing to retard the vapor entering/leaving the basement. That product is similar to asphalt-faced f.g., a variable vapor retarder; http://www.buildingscience.com/docum...vapor-barriers

Membrain: http://www.bestofbuildingscience.com...3-4_p37-40.pdf

It has almost exactly the same variable permanence range as real plywood. I would use it above grade: "SVR" pp. 5; https://docs.google.com/viewer?a=v&q...sNmmYf-psHZnLA

You may have read this from page 29/73: "Assuming the XPS is well sealed to the concrete foundation, the condensation plane is now the interior XPS surface and will be warmer than the concrete, which should result in less potential condensation, and less vapor diffusion from the concrete." It also acts as a thermal break from the studs to the basement temperature. How many of the systems here have a vapor retarder next to the drywall without moisture problems; http://www.buildingscience.com/docum...study-analysis

Say you used that product and forgot the poly sill-sealer under the p.t. bottom plate--- basement air to the concrete wall to condense and wet the f.g. insulation, we know that's not good for the R-value; http://archive.nrc-cnrc.gc.ca/eng/ib...ling-heat.html

Gary
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Old 01-02-2013, 09:25 PM   #5
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Seeking Suitability for DryRight Insulation in basement


Wow. Thanks for the info! I'm staring to read the now.

One other note for my particular insulation to consider is that I'll have some unfinished space accessible by door. This unfinished area is connected to the air gap for one of the perimeter walls. Do I have to worry about the warm air reaching the concrete walls through this unfinished area?
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Old 01-04-2013, 07:18 PM   #6
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Seeking Suitability for DryRight Insulation in basement


Unconditioned spaces should be separate from conditioned ones.

Gary
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Clothes taking longer to dry?
Clean the dryer screen in HOT water if using fabric softener sheets.
They leave a residue that impedes air-flow, costing you money.
Clean the ducting in the last six months? 17,000 dryer fires annually!
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