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05-23-2018, 06:30 PM | #2 |
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Company I work for builds modular homes (not the same as manufactured/mobile)... We rarely use spray foam in any application. Usually build with 12" energy heel trusses and R-39 in the attic. If you don't have energy heels, just make sure the ends are as well insulated as you can get them.
You're talking about the roof, but you probably don't know the exact condition of your walls either. I'd highly recommend first getting a blower door test done to see where you are leaking. I'd use the test results and focus on a better envelope by getting proper exterior air tightness/sealing. Once you know you're airtight, then you can focus your efforts. You may find you need to add rigid insulation to the exterior walls as well. If you are looking to have a well insulated home, you should install a good air exchange system with a heat recovery ventilator, etc because not only will it improve the air quality, it will help with heating and cooling costs. If you do insist on spray foam, it can be better provided those steps are performed above. I say "can be," because spray foam installers don't always fill every crevice either and an air gap is an air gap. You have to be well-sealed one way or the other. You'll probably spend 3-4 times as much on the insulation, but ROI in modern applications is much better at around 5 years. If there were any place I'd absolutely consider spray foam personally, it is in the attic. |
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05-23-2018, 06:41 PM | #3 |
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I sell new homes and condos that use spray foam insulation and solar panels.
If done right (thick walls, on the rafters in the attic), your home will act like a cooler. 2000 sq ft home has ~ $20 electric bill... in Austin Tx which is hot as hell. |
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05-23-2018, 07:03 PM | #4 |
Keepin it Real
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I just had 8” of insulation added in our attic last week. 2100sq ft home cost us $1250. It wasn’t spray foam though. It’s some kind of cotton candy type material.
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05-23-2018, 07:09 PM | #5 |
Mammoth penis
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My house is close to yours, a little over 2300 sq ft. If you'd be willing I'd love to hear how much (if any) you notice in your utility bill the next couple months.
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05-23-2018, 07:11 PM | #6 | |
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Quote:
Tell me more.. I wonder if that application would have the same effect in a more humid environment, say Florida? |
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05-23-2018, 08:00 PM | #7 |
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50% of doing it right has absolutely nothing to do with the insulation itself and much more to do with the prep in proper sealing. You get the benefit, like me, of having a new home to work with where everything can be sealed, checked, sealed in missed areas, then sprayd. He isn't getting that benefit in an old home just by spraying some foam upstairs, but he can get closer if he takes the proper steps.
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05-23-2018, 08:06 PM | #8 |
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Just use asbestos.
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05-23-2018, 08:07 PM | #9 |
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05-23-2018, 08:08 PM | #10 |
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05-23-2018, 08:09 PM | #11 |
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05-23-2018, 08:10 PM | #12 |
Shit
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05-23-2018, 08:10 PM | #13 |
Shit
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05-23-2018, 08:23 PM | #14 |
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05-23-2018, 08:25 PM | #15 |
Keepin it Real
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It had 2” of old insulation in it when we bought it. Unfortunately, we have only been in this house since April 1st so won’t be able to compare previous months.
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