Attic Doesnt Have Vapor Barrier, Should I Remove Paperback Batting And Add Spray Foam - Insulation - Page 2 - DIY Chatroom Home Improvement Forum
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Old 01-08-2015, 02:52 PM   #16
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I have a split level home one of the attics is 440sqft. Has 4 low vents and from what I can see 2 roof vents....?
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Old 01-08-2015, 08:47 PM   #17
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Quote:
Originally Posted by Windows on Wash View Post
Unless your funds are limitless, it is a poor allocation of funds.

The ROI on 2" of CC foam over, for the sake of assumptions, 1,000 sq/ft is terrible as compared to spot sealing.

All of the can light, flue, electrical, and other misc. sealing protocols are the same whether you are spraying bulk foam or spot sealing.

Bulk application of 2" of CC SPF via froth packs or other homeowner applications is not recommended in my opinion either. Not only are they expensive and the yield is crappy, the quality is not nearly as good as it would be with a professional and rig set up.

I've had experiences with a Dow 'froth pack' which locked me out about 1/2 way or less through a rim joist spray of the basement and first to second floor bays. The lumberyard made good, but I eventually returned the replacement pack for full credit and did not complete the work. (One of my own properties).
More recently I bought the 600 square foot Touch-n-Foam froth pack and it cost near 1/2 what I had paid for the Dow product.
It worked great, no problems.
I've also had professionally applied foam; Icynene, in my 1830's CT home, and closed cell foam applied in my VT home and barn, from top to bottom in all the new construction parts. I've had varied success with the product sprayed in VT due to various factors, some of which may have been install related and some may have been weather related, or interface of old parts of the house to new. I'm still trying to solve the water infiltration into my mudroom and dining room, with varied success. Long saga.
I agree, again, that there are other more cost effective ways to insulate an attic floor. Let's move on.


We are on the same page on the necessity of foam for air sealing, but in terms of R-Value in a traditional and vented attic, blown in insulation is the king when it comes to bang for the buck.

$6,000 is a bunch to make up when you are looking at cost analysis. If the spot sealing will run him half of that, the additional $3,000 would go a long way towards other fuel savings measures.

The poster has yet to confirm the ventilation equation but I hope his contractor would note that and make the necessary modifications.
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Old 01-09-2015, 09:43 AM   #18
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Good luck with the 600 board foot kits.

You have to get them good and warm for them to work well. I usually like them at about 100-110 degrees. You can warm them in a bath or bucket of warm water.

They are age sensitive so don't count on getting good yield if its more than a year old.
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Old 01-09-2015, 11:20 AM   #19
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Yes, they don't improve with age.
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