Home>Discussions>INSULATION & HVAC>Foam vs other insulation in Rye, NY
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epandoesq
Foam vs other insulation in Rye, NY

I am in the process of bidding on a new construction and we are talking about whether we should be using foam insulation. I have heard some people say it makes the home almost too tight and doesn't allow it to breath. what are peoples' thoughts on foam vs. more traditional forms? Is it better to use foam in certain places in the home, like windows and doors and use traditional insulation in the walls? I am being told it can cost upwards of $35,000. We are in the northeast and Rye is not an area affected by the housing market. Any feedback would be greatly appreciated.

Erika

jkirk
Re: Foam vs other insulation in Rye, NY

spray foam insulation costs roughly 3x the cost of the standard fibreglass insulation and blown in up in the attic.
there are major advantages to foam in certain places, all the homes we do only get key areas sprayed, the ribbon of the floor system gets sprayed to make it airtight as fibreglass and vapor barrier isnt as efficient.

also we hit the attic with a 1" layer of foam on top of the ceiling drywall to create a better seal from there we top it off with 10-12" of blown in cellulose. last year we built a 4000 sq ft vet clinic, mind you it was icf consruction. by doing the mentioned method it was a savings of $12,000 just for the ceiling

cathedrawel ceilings only get foam, as it has a far higher r-value

epandoesq
Re: Foam vs other insulation in Rye, NY

thanks very much. that was very helpful.

mtcooper
Re: Foam vs other insulation in Rye, NY

We were glad to see this posting, we are renovating a home in the Midwest USA. We've completely gutted the interior and stripped the exterior and have some insulation questions about foam vs. other. We re-framed the interior giving most of the interior space vaulted ceilings. JKirk said that such ceilings only need the spray foam. Our question pertains to this . . . do we need to install baffles between the insulation and roof sheeting to allow for air circulation?

motoguy128
Re: Foam vs other insulation in Rye, NY
mtcooper wrote:

We were glad to see this posting, we are renovating a home in the Midwest USA. We've completely gutted the interior and stripped the exterior and have some insulation questions about foam vs. other. We re-framed the interior giving most of the interior space vaulted ceilings. JKirk said that such ceilings only need the spray foam. Our question pertains to this . . . do we need to install baffles between the insulation and roof sheeting to allow for air circulation?

There's no need for an air gap with spray foam, if the foam is at least 3" thick... which it would be in this case. Air movement is only needed when air is likely to get trapped and be cooled below it's dew point. Foam doesn't allow free air movement and blocks infiltration. Fiberglass doesn't and inherently must have osme ventilation to prevent condensation.

jkirk
Re: Foam vs other insulation in Rye, NY

for the most detailed bit of information on insulating a roof, your best bet is to pick up the latest issue of fine homebuilding. they have a article specifically on this topic

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