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Message
re: Foam insulation in new construction
Posted on 11/10/18 at 12:36 pm to AUsteriskPride
Posted on 11/10/18 at 12:36 pm to AUsteriskPride
quote:
Open cell beneath roofed areas allows for leakage sites to be found.
Im not sure if thats true. open cell is the most absorbent material on earth. After the flood, we spooned out the insulation from the walls, it was like watermelon, 100% saturated. even a month later I would find a spoonful in a crack, and still fully saturated. in the attic you would not know where the leak came from, and let me tell you that stuff is a second skin on OSb
the whole house breathing thing is not really a concern anymore. if you go in and out your house 3-4 times a day you good.
1
Posted on 11/10/18 at 12:38 pm to craynagin
I’d say yes but hire real professionals who know what the hell is up
Posted on 11/10/18 at 2:08 pm to Rust Cohle
quote:
Im not sure if thats true. open cell is the most absorbent material on earth. After the flood, we spooned out the insulation from the walls, it was like watermelon, 100% saturated. even a month later I would find a spoonful in a crack, and still fully saturated. in the attic you would not know where the leak came from, and let me tell you that stuff is a second skin on OSb
the whole house breathing thing is not really a concern anymore. if you go in and out your house 3-4 times a day you good.
Agreed, at the thickness required for an R30 - I believe that's northern LAs climate zone, it would be around 8" of open cell. A slow leak would most definitely absorb into the material and not be noticed. But that's beside the point. I like a closed cell foam for the air impermeability. Here in new mexico, we actually roof with it (my company does also), so you insulate from your roofing material. The only concern then is UV damage, to which we coat the foam. If kept free of UV damage to the foam, it will last a lifetime.
quote:
the whole house breathing thing is not really a concern anymore. if you go in and out your house 3-4 times a day you good.
My biggest concern, which is why you tie it all in to your HVAC system, then you'll never have to worry about mold/mildew again.
Most climate zones in New Mexico don't have a relative humidity that allows for mold growth, so it's a different animal.
This post was edited on 11/10/18 at 2:09 pm
Posted on 11/10/18 at 2:15 pm to guttata
quote:
In the end, it was going to take like 8-10 yrs to break even, and no one was going to pay $20k+ more for our house just b/c it had spray foam insulation. I also believe that if spray foam was really worth it, why wouldn’t everyone do it?
8-10 years isn't a large break even point. And yes, buyers will pay a premium for a house they have lower energy costs for. Also, there are air quality benefits, structural benefits, and pest control benefits. It doesn't just stop at R value with spray foam.
Posted on 11/10/18 at 2:17 pm to GumpInLex
quote:
radiant barrier
Say goodbye to your cell service.
Other than that, it's good stuff
Posted on 11/10/18 at 2:45 pm to craynagin
quote:
Main rub is it doesn't allow the house to breath.
This^^
It really has to be done correctly or you’ll be in for some serious problems. Some say even done properly, the house is still too air-tight. Couple that with the fact that it is expensive as hell - you better plan on living there for a long time to recoup the benefits of the added expense.
Posted on 11/10/18 at 2:56 pm to craynagin
I did spray foam in my attic and it took 100 bucks a month off my cooling bill. (I also replaced most of my windows, however I can go in my attic in the summer without the threat of heat stroke)
Posted on 11/10/18 at 3:02 pm to Supermoto Tiger
quote:
Some say even done properly, the house is still too air-tight.
This what some old timers like to say. The truth is you can't get a house air-tight enough. But when you achieve a tight envelope, you need to add a fresh-air exchange. Then you don't need to rely on Pedro not caulking a window properly for your fresh air like in a non-tight house.
The only time you can say a house is "too tight" is when you're improperly using terminology. This is usually referring to sheathing that is trapped between two air barriers without airflow.
Posted on 11/10/18 at 3:25 pm to Chuker
What is fresh air exchange and how can I know if I have it ? What does it look like ? I just bought a house with spray foam on my roof deck and I know nothing about it.
Posted on 11/10/18 at 3:32 pm to AUsteriskPride
AUsteriskPride, could you email Me?
I have some questions about adding spray foam insulation to an existing home.
I have some questions about adding spray foam insulation to an existing home.
This post was edited on 11/11/18 at 2:27 pm
Posted on 11/10/18 at 3:50 pm to craynagin
I have it in mine and haven’t regretted it at all
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