ICF For Slab-on-Grade Foundation?

 
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Old 10-17-2010, 02:32 PM   #1
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ICF For Slab-on-Grade Foundation?


Working on finalizing plans for an addition for my own home.

Current home is slab on grade with a block foundation.

Have been tossing around the idea of using ICFs for the addition foundation for a few reasons, mostly as a way to familiarize myself with the system for future projects.

1. Is it worth it? Cost of laying block vs. ICF?

2. Benefits of ICF when all of it will be below grade?

3. Does the ICF form need to be treated a special way when it will be backfilled and below grade?

I'm sure there are more questions, but thought this would be a good area to start.
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Old 10-17-2010, 02:48 PM   #2
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Re: ICF For Slab-on-Grade Foundation?


From a framers prospect ICF is not worth it unless you have a really good mason. I have yet in 20 years in the biz to see one come out 100%.
I would shoot for superior walls
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Old 10-17-2010, 02:50 PM   #3
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Re: ICF For Slab-on-Grade Foundation?


Quote:
Originally Posted by festerized View Post
From a framers prospect ICF is not worth it unless you have a really good mason. I have yet in 20 years in the biz to see one come out 100%.
I would shoot for superior walls
I've looked at them, but don't see the benefit in this situation. Everything will be underground. No crawl space - slab on grade.
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Old 10-17-2010, 02:55 PM   #4
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Re: ICF For Slab-on-Grade Foundation?


They make walls just for that situation. Draw up a sketch with some pics and send it to them, at least see how much their product is compared to block & ICF
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Old 10-17-2010, 02:57 PM   #5
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Re: ICF For Slab-on-Grade Foundation?


Quote:
Originally Posted by festerized View Post
They make walls just for that situation. Draw up a sketch with some pics and send it to them, at least see how much their product is compared to block & ICF
Really?

Ability to backfill interior and exterior? Now I'm interested....
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Old 10-17-2010, 03:16 PM   #6
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Re: ICF For Slab-on-Grade Foundation?


That was kind of dumb that I posted that
Iím multi tasking today, not paying attention
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Old 10-17-2010, 03:22 PM   #7
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Re: ICF For Slab-on-Grade Foundation?


Quote:
Originally Posted by festerized View Post
That was kind of dumb that I posted that
Iím multi tasking today, not paying attention
Close enough, thanks for the info either way.
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Old 10-17-2010, 04:03 PM   #8
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Re: ICF For Slab-on-Grade Foundation?


A system I used which was called bluemaxx and has been renamed arxx were ICF forms ran about $14 each 48" long I believe 16" high when I used them about ten years ago. The outside required a membrane with a peel and stick adhesive below grade for waterproofing and then the portion above grade was parged for aesthetics with a morter like product they also sell for that purpose.

The distributor walked me thru the whole thing.

A modular home builder we worked for charged $100/linear foot for a 9 foot wall when concrete was $70/yd and the forms were $14 each. There is plenty of rebar in these walls. Be sure to get accurate pricing for the size they require.

The builder switched brands because the first brand bowed. The distributor said it was becase they poured too fast. Arrx recommends and double 90 elbow on the boom to slow down the pour. Ask plenty of questions about the speed of the pour. It seems to be an issue.

In the case where we used them for garage floors that were backfilled, we did not do anyhting special on the inside or outside wall and the waterproof membrane was skipped. Only the parging above grade was required for looks.

If you have any other questions I will try to answer if you post them but there is plenty of information on the web.

I google insulated concrete forms and shazam. It was there.

There is also a trade organziation for them.

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