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-   -   New Construction Spray Foam Insulation (https://www.diychatroom.com/f103/new-construction-spray-foam-insulation-653143/)

Velosprints 02-10-2019 06:28 PM

New Construction Spray Foam Insulation
 
I am acting as GC for my new construction home build and I was wondering if anyone here has had experience with spray foam insulation for an entire house? I really think it will make a difference over time, but I am having trouble coping with the costs vs benefits.

Has anyone sprayed their own home, or had it done by a professional? In your opinion, was it worth it? Is it noticeable? Its sooooo expensive!!

Oh - and an important bit of info: I plan on spraying the insulation by myself. I can't justify hiring a contractor, so if it is to be, it is up to me.

joecaption 02-10-2019 06:36 PM

Re: New Construction Spray Foam Insulation
 
Is it better, yes.
Is it a DIY job NO WAY!

Velosprints 02-10-2019 06:38 PM

Re: New Construction Spray Foam Insulation
 
Why?


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Bud9051 02-10-2019 06:46 PM

Re: New Construction Spray Foam Insulation
 
We need to know your climate region, add a nearby big city to your profile.

I haven't done it because it cost too much, sound familiar.

I'm in the energy business and my take on spray foam insulation is the mfg's take so much profit it is barely cost effective use in a residential home. Plus, spray foam was more popular when homes were not well sealed. Today one can built a very tight home so the air sealing properties of foam add little to the benefit list.

Air quality inside a home requires a lot of fresh air. Once sealed super tight, which foam will do, you MUST add ventilation, search HRV (heat recovery ventilators).

IMO, DIY an entire house would be out of the question, bigger topic. Plus, using conventional well tested methods you can build a very efficient home all well within the DIY approach. Search "net zero" or "energy efficient" homes.

Bud

Velosprints 02-10-2019 06:49 PM

Re: New Construction Spray Foam Insulation
 
I appreciate the response Bud. I live in northern VA in between Winchester and Leesburg. Does spray insulation help at all with sound dampening? The area Im moving to gets extremely windy, and Id love to dampen some of the noise.


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Yodaman 02-10-2019 06:50 PM

Re: New Construction Spray Foam Insulation
 
I feel your pain brother. When I did the complete remodel of my existing home I went out for spray foam quotes. The quotes came back at 4 to 5 times the cost of what I could do in fiberglass. So you can guess which route I took.
But there are some advantages to the foam which fiberglass is lacking. Air sealing is huge in todays super tight homes. High density foam excels here. Areas like around the the rim joist are difficult to seal and foam is great here. Other areas where achieving the desired R value in fiberglass might be difficult, high density foam is about as good as gets. Cathedral ceilings come to mind.

You might ask you contractor to supply some ROI numbers to help wrap your head around the extra cost.


If you decide you need or want the foam, hire it out. Nearly everything I have read about DYI spray foam is negative. Cost savings is minimal as actual yields are lower than stated.
(this is bulk coverage spraying, not spot spray which I went through 2-3 cases? of great stuff)

Velosprints 02-10-2019 06:56 PM

Re: New Construction Spray Foam Insulation
 
This is all good info. Thank you! To be honest, its my wife who is pushing the DIY foam job. I feel like wed be in over our head QUICK


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SPS-1 02-10-2019 07:06 PM

Re: New Construction Spray Foam Insulation
 
Quote:

Originally Posted by joecaption (Post 5765695)
Is it a DIY job NO WAY!

Quote:

Originally Posted by Velosprints (Post 5765699)
Why?


Because if you screw up the mixing, it won't fully cure, and will off-gas toxic compounds for a very long time. (i.e bring out the bulldozer)


Also, the chemical reaction as it cures creates heat. Because it is such a good insulator, the heat has trouble getting out. If you spray it too thick, it can catch fire.

Bud9051 02-10-2019 07:07 PM

Re: New Construction Spray Foam Insulation
 
Even doing your own work or being your own GC has a lot of kinks that need to be considered and there are several threads here along those lines. In some locations a home owner can do almost everything, but in other places licensed contractors are required.

Do you have a piece of land already?

Bud

Velosprints 02-10-2019 07:08 PM

Re: New Construction Spray Foam Insulation
 
Sure do. Second floor walls going up tomorrow.


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joecaption 02-10-2019 07:18 PM

Re: New Construction Spray Foam Insulation
 
Building it with 2 X 6 walls?
I live right on the bay in VA and wind noise has never been an issue.

Velosprints 02-10-2019 07:22 PM

Re: New Construction Spray Foam Insulation
 
Unfortunately no. 2x4.


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Richard Pryor 02-10-2019 08:56 PM

Re: New Construction Spray Foam Insulation
 
With 2x4 you won’t be able to do more than r-13 I believe. Why not 2x6?

What about roof? You doing trusses? Rafters? 2x12 rafters? Vaulted ceiling?

I’m building a house now and also acting as a GC. I’ve been doing a lot of reading because I want my house to be perfect.

We did spray foam in a metal shop that we currently live in and it is very good but I get condensation where the chimney pipe exits the building. Other than that I like spray foam.

But I’m not doing it on my home. First because of cost and second because I believe you can do a good job if you do everything by the book with fiberglass.

Can you even do 2x4 in VA? New construction? R-13 is pretty weak.

Richard Pryor 02-10-2019 09:00 PM

Re: New Construction Spray Foam Insulation
 
Oh, and forget about spray foaming your own house. It’s definitely not a diy job. Fiberglass is and you can save a lot of money that way.

Yodaman 02-11-2019 07:46 AM

Re: New Construction Spray Foam Insulation
 
Quote:

Originally Posted by Velosprints (Post 5765749)
Unfortunately no. 2x4.


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2 x 4 walls and R13 fiberglass is light for the climate zone 4 recommendations. Are you planning to use Foam sheathing on the outside?


http://insulationinstitute.org/wp-co...12/VA-2012.pdf


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