Lbear
Veteran Member
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| 29 Oct 2012 04:08 AM |
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I just noticed that the Nudura ICF has these grooves that run vertically throughout the interior portion of the ICF. I measured the space inside of the 6" ICF and from projecting groove to projecting groove, it is 6". These grooves are a 1/4" in size so they add another 1/2" to the form, making it 6 1/2" if you measure in between the grove to the other side.  What is the purpose of these groves? Compared to a Foxx Block ICF, which doesn't have them, what purpose do they serve? |
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Alton
Veteran Member
Posts:2164
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| 29 Oct 2012 09:08 AM |
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I have been told that the grooves lock the concrete to the EPS. |
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Residential Designer &
Construction Technology Consultant -- E-mail: Alton at Auburn dot Edu Use email format with @ and period .
334 826-3979 |
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Lbear
Veteran Member
Posts:2740
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| 29 Oct 2012 11:40 AM |
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Posted By Alton on 29 Oct 2012 09:08 AM
I have been told that the grooves lock the concrete to the EPS.
That makes sense. Interesting that it makes the 6" advertised core space really calculates out to 6 1/2" when you take into account the spacing between the grooves. In a large wall space I wonder how much extra concrete this accounts for? |
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fallguy
New Member
Posts:55
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| 29 Oct 2012 04:58 PM |
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dont they also have end caps that slide down into those dove tails? |
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ICFBdr
Basic Member
Posts:238
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| 29 Oct 2012 05:28 PM |
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You are correct - the dove-tailed design allow the end caps to lock into Nudura's forms (edges of the end cap have the oppsite dove-tail of the block). The idea behind them is to create a truly monolithic wall - ie, when your concrete shrinks as it cures, it will pull the EPS with it, rather than leave an air gap.
I believe you are left with the equivalent of a 6.25" cavity, as the extra 1/2" is half taken up the EPS that forms the dovetail. |
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Lbear
Veteran Member
Posts:2740
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| 29 Oct 2012 06:10 PM |
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Posted By ICFBdr on 29 Oct 2012 05:28 PM
You are correct - the dove-tailed design allow the end caps to lock into Nudura's forms (edges of the end cap have the oppsite dove-tail of the block). The idea behind them is to create a truly monolithic wall - ie, when your concrete shrinks as it cures, it will pull the EPS with it, rather than leave an air gap.
I believe you are left with the equivalent of a 6.25" cavity, as the extra 1/2" is half taken up the EPS that forms the dovetail.
Has anyone taken any photos after they poured a wall and stripped away the form to see what it looks like? |
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FBBP
Veteran Member
Posts:1215
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| 29 Oct 2012 07:51 PM |
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Posted By Lbear on 29 Oct 2012 06:10 PM
Posted By ICFBdr on 29 Oct 2012 05:28 PM
You are correct - the dove-tailed design allow the end caps to lock into Nudura's forms (edges of the end cap have the oppsite dove-tail of the block). The idea behind them is to create a truly monolithic wall - ie, when your concrete shrinks as it cures, it will pull the EPS with it, rather than leave an air gap.
I believe you are left with the equivalent of a 6.25" cavity, as the extra 1/2" is half taken up the EPS that forms the dovetail.
Has anyone taken any photos after they poured a wall and stripped away the form to see what it looks like?
Integraspec uses the same grooves. When we try to remove the foam, it tends to break at the grooves leaving the dove tail in place. I have several cores that we have cut out of walls and it is easy to see how well this system work. Nudura has an advantage on the simpler projects because of their bigger blocks and that they fold out. A bit quicker. Integraspec is a bit handier for complicated jobs in that the panels are smaller and loose. Yes you can order Nudura loose as well.
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theInvincible
New Member
Posts:74
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| 29 Oct 2012 09:56 PM |
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I poured 2 times nudura forms. Vibrator used in the first pour with 6" slump. Vibrator is not used for 2nd pour because slump was too high 9". I can easly say that those cavities are filled and concrete holds the forms strongly for the first pour. But in my second pour cavities are not filled.
My concrete amount ordering never failed. I ordered 10% more. |
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slowroadster
New Member
Posts:16
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| 02 Nov 2012 09:12 PM |
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I had to strip part of my existing liteform basement wall when i built an addition, there were no voids and the foam was very difficult to strip from the concrete. Incidently it was poured in sub freezing weather! |
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ICFHybrid
Veteran Member
Posts:3039
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| 03 Nov 2012 12:53 AM |
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Has anyone taken any photos after they poured a wall and stripped away the form to see what it looks like?
It looks all stripey. :-) The alternating ridges of concrete make it fairly difficult to drill the concrete for anchors as the bit wants to "walk", particularly if the target you have chosen is on the edge of one of the stripes. |
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Lbear
Veteran Member
Posts:2740
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| 03 Nov 2012 01:29 AM |
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Posted By ICFHybrid on 03 Nov 2012 12:53 AM
It looks all stripey. :-)
The alternating ridges of concrete make it fairly difficult to drill the concrete for anchors as the bit wants to "walk", particularly if the target you have chosen is on the edge of one of the stripes.
Did you go with Nudura? I thought you went with a different ICF manufacturer? There is also another technical reason why they have those groves, it was somewhat technical but maybe TexasICF will chime in to explain... |
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arkie6
Veteran Member
Posts:1453
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| 03 Nov 2012 12:11 PM |
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I used LiteForm ICF which is smooth on the interior. Concrete sticks to EPS foam surprisingly well. I removed a few small areas of foam for inspection and setting a few anchors after-the-fact and I had to tear the foam out in bits and pieces - it wasn't as easy as taking a hot knife and cutting out the desired shape back to the concrete and popping out the piece of foam. |
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