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mko
Registered Users
Posts:2
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| 07/15/2008 12:46 PM |
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First of all, my thanks to the forum admin and contributors for such an informative sight. I have visited here often and have finally decided to join in hopes of obtaining some needed information. I built the basement for my house dry-stacking twelve rows of 12-inch wide CMUs, topped by two rows of 8-inch CMUs, which are centered over the 12-inch blocks. The cores were filled with rebar and concrete. I have about 2’ of ½” rebar extending through the top of the blocks, spaced every 4 – 6’. Surface bonding cement was applied to both sides of the wall, except for the top two rows of 8-inch blocks. The outside dimensions of the walls measure 36’ by 36’. I’d like to finish the rest of the walls, at least the first floor, using ICFs. The house will have a gambrel style roof, so only two of the walls will extend beyond the first floor, with the exception of a short stem wall on the two opposite sides. I will also need a way to attach the second story flooring. My plan is to attach 2x wood siding on both the inside and outside.
My question is, can ICFs be used in this situation where I’m not starting from the ground up, but rather from an existing basement wall? If so, is there a particular style/size of ICF that would be better suited for this application?
Thanks in advance for your consideration. |
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Paul Stevens
Registered Users
Posts:143
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| 07/15/2008 5:26 PM |
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I can't see any reason why you couldn't put ICF's on top of CMU's but before we all start telling you which product to use and how to do it I would highly recommend contacting an engineer to make sure that there won't be any structural problems with pouring 2 stories worth or ICF on top of CMU's, just for peace of mind, once you have that reassurance then get back to us and I am sure the flood gates will open with all kinds of ideas, I know I have some.
Paul Stevens |
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Manfred
Registered Users
Posts:58
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| 07/15/2008 7:33 PM |
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mko, there is no reason why you should not be able to continue on with ICF on top your CMU walls. You must be sure that the workmanship of the CMU installation and its core filling was in accordance to standards. Mortar beds must be full and continuos.
In NC this is done day in and day out. I appreciate the fact that you must be in a colder climate due to yopur basement installation. Regardless, once installed correctly, the basement is a stand-alone structure on which you should be able to build. My opinion takes into consideration that tyhere are no extenuating circumstances that would prohibit you from doing that.
A stuctural engineer will provide you with the piece of mind that you will need to continue. Any advice you are getting here is just that: advice from experience. Taking in consideration the special applications employed only a qualified professional such as an engineer should have the final say. Where are you located?
Manfred Knobel
Moss Pointe Builders |
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mko
Registered Users
Posts:2
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| 07/16/2008 10:43 AM |
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Southern middle Tennessee, between Nashville, TN and Birmingham, AL. Close to Huntsville.
The house was originally going to be a log home, and the basement was designed to support the weight of all the logs. |
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Manfred
Registered Users
Posts:58
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| 07/20/2008 9:24 AM |
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mko, sorry for the late response.
I still don't see any problem with installing ICF over CMU as long as your soil bearing capacity is ok. At 4000lbs a yard concrete will be a lot heavier than logs. Regardless, as long as the soil bearing is ok and the spread footers are installed, lets say 24" wide by 12" deep you should be fine.
Manfred Knobel
Moss Pointe Builders
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yogia
Registered Users
Posts:78
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| 07/27/2008 9:00 PM |
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Hi mko:
It would have been nice if you had the basement walls also of ICF construction. Anyway, as Paul Stevens and Manfred Knoble have so eloquently stated that there does not appear to be a reason why you can not continue with ICF over CMU block basement walls -- still a Structural Engineer's review of the existing situation and your proposed way forward should be sought to alleviate any unforeseen problems.
I have had projects going both ways -- ICF over CMU block wall, and CMU block wall over ICF wall. What needs special attention in such cases, from Structural viewpoint, is the detailing at the interface of ICF and CMU block wall to make sure that there is effective load transition down stream all the way to mother earth. |
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Regards!
Yogi Anand, D.Eng, P.E.
Energy Efficient Building Network LLC
http://www.energyefficientbuild.com |
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