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Old 01-17-2009, 08:39 AM   #1
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Spray foam insulation


We were going to install batt insulation ourselves, but got some prices for spray foam insulation as well in our third floor, which has vaulted cathedral ceilings. The cost of the batts would be about 700, the spray icynene foam is going to be about 1800.

The installer would spray a 3 inch layer which would envelope the entire roof and the walls on eht 3rd floor. I know a majority of heat loss goes through the roof, I'm just trying to figure out the cost/benefit savings as well as increased comfort level.

Anyone have experience doing spray foam, or should we just put in batts ourselves?

I've read alot about the spray foam and everything seems to tout its benefits, no needed ventilation in roofs, much better air barrier, etc.

Thoughts?

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Old 01-17-2009, 09:42 AM   #2
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Spray foam insulation


when price comparing you must also consider the R-value of the $700 worth of batts vs. R-value of 1800$ worth of spray foam.

if it is the same or close, i'd just batt it myself because it is an attic. doesn't need to be pretty, doesn't need to hold moisture (like basement walls) if its a tiny bit more drafty, who cares its an attic with attic fans anyway.

my $0.02

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Old 01-17-2009, 12:23 PM   #3
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Spray foam insulation


Spray foam has a lot of advantages for spraying under roof decks in cathedral ceilings. Go to buildingscience.com for info on it. Go to the dept of energy website for recommended insulation R value in your area.

Not sure where you live but it got quite pricey for me because I wanted to do R50 to prevent ice dams.
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Old 01-25-2009, 08:36 PM   #4
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Spray foam insulation


Why not consider an inch or 2 of DIY closed cell spray foam and then putting in the fiberglass to build up to the r-value you want? That gets you all the benefits and probably saves a little money too. What's best is the spray foam seals out air, which will make the fiberglass insulation work alot better. According to www.sprayfoamdirect.com, no amount of fiberglass will ever seal out those air leaks.
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Old 01-25-2009, 09:09 PM   #5
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Spray foam insulation


If you are in part of the country where you spend more time heating than cooling, spraying closed cell on the roof deck will put a vapor barrier on the cold side. Fiberglass doesn't act as a vapor barrier so you could get condensation on the inside surface of the spray foam. People do this but I wouldn't trust it until I saw some research saying you won't get into a condensing situation. Perhaps it would work with open cell as open cell is an air barrier but not a vapor barrier
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Old 01-25-2009, 10:09 PM   #6
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Spray foam insulation


There's nothing wrong with a vapor barrier on the cold side. You are allowed to do this, in warm or cold climates. What most people don't do is include enough insulation to get the wall assembly below the dewpoint on the exterior.

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Old 09-10-2009, 11:02 AM   #7
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Spray foam insulation


I think you might be able to get the sprayfoam job done for less then 1800. Submit a request for quote online and I'll get back to you in person: Sprayfoam Insulation.
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Old 05-24-2011, 06:28 PM   #8
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Spray foam insulation


We went with spray foam insulation too and saved some cash doing it ourselves.
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Old 05-24-2011, 06:56 PM   #9
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Spray foam insulation


I strongly suggest the spray foam for cathedral ceilings. The cost is equivocal, here's why:

1.) The 3 inch quote is good, that is standard (minimum 3" gauranteed) - you get r-7 per inch so you will get at least r-21 (equal to a little more than the 2x6 batt insulation at r-19, which is not enough).

2.) They ALWAYS spray about 5-6 inches because it is easy and cheap for them to overspray rather than have to go back because of poorly filled areas...you will get r-28-42 probably in over 50% percent of the area.

3.) It is a disaster to fight with putting batts up in a cathedral ceiling, whether you do it yourself or pay someone. --- It will take a LOT longer to do the batts, at least two-3 times as long.....so major labor savings or your time cost.

4.) finally, just because it is the standard in good construction/practices now to use spray foam because most rafters are framed using 2x6's and you simply cant get the r-value in there (you can cut rigid foam but that is a labor intensive process also).

You will probably save halve of the 1100 dollar difference in labor/your time alone, and the rest over the next couple of years in increased efficiency (and comfort).

(i have no ties to the industry btw, it is simply a product that delivers and i believe you get what you pay for in this case).

When you see how messy and what a temporary environmental disaster it is putting the stuff in, you will think the price is well worth it.
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Old 05-24-2011, 06:57 PM   #10
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Spray foam insulation


CRAP.

didnt see someone Necroposted. thanks dude. wtf.

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