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Old 10-04-2010, 09:16 AM   #1
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inset vs. face stapling insulation


had a couple of contractor come over and give quotes for some drywall I need hung and finished. The last one asked that I staple all the instulation on the inside of the framing, rather than face stapling everything. Most articles I have found elsewhere, say that face stapling creates a better vapor barrier, and less chance of voids between the drywall and insulations.

Is the contractor just wanting an easier installation since the framing will be exposed, or is there a reason for this?

Also, is there any reason why insulation has jumped in price - other than winter is around the corner, and mfg just want to make more? From last month to this month, most everthing has gone up $5-15. Kraft faced R30 batts went from 40 to 52 (after rebates). Ironically unfaced R30 batts only went up 10 cents?

thanks.

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Old 10-05-2010, 03:47 PM   #2
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inset vs. face stapling insulation


You cannot glue drywall over the insulation flanges. This is probably his reasoning. Flanges do not have to be on stud edge for vapor retarder: http://www.certainteed.com/additiona..._Retarders.pdf

If you staple inside on stud face, you will lose much R-value: http://oikos.com/library/insulating_...lls/index.html
I hope you caulked all joint around studs to sheathing stopping air: http://findarticles.com/p/articles/m...6/ai_n8582994/

You may still get convective loops for further loss with fiberglass, especially if using box store low density batts: http://www.buildingscience.com/docum...archterm=insul
I hope you air seal the drywall first: http://www.buildingscience.com/docum...wall-approach/

I can't say anything about the prices except fiberglass batt insulation is the worst choice so it is the least expensive.

Gary

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Old 10-05-2010, 07:22 PM   #3
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inset vs. face stapling insulation


Use unfaced insulation and cap it with a plastic vapor barrier.
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Old 10-05-2010, 07:39 PM   #4
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inset vs. face stapling insulation


Yep, kraft facing is not a vapor barrier. It is a retarder at best. Should be stapled inside the studs. Most of the rest depends on your location. Sealing wall cavities can be a bad idea in certain climates.
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Old 10-05-2010, 11:32 PM   #5
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inset vs. face stapling insulation


If you are thinking about using plastic, check your location first: http://www.buildingscience.com/docum...-for-buildings

Gary
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Old 10-06-2010, 08:11 AM   #6
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inset vs. face stapling insulation


Quote:
Originally Posted by GBR in WA View Post
If you are thinking about using plastic, check your location first: http://www.buildingscience.com/docum...-for-buildings

Gary
Part of the sign up procedure should include a region. How many times is the question asked, "Where do you live?"
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