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bbicf
Registered Users
Posts:23
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| 09/17/2008 1:56 AM |
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Good day
I am doing a multi level house. The first level is a 4ft crawlspace. I had read somewhere before that I could attach the floor system and then pour. Is this possible? What would need to be done? I am fairly comfortable trying something at this height for now and it would help with timing but just wanted to check if the walls would be strong enough to hold the floor system without concrete. I could set up my bracing outside the wall for extra support. Any comments?
Thanks Nathan |
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Paul Stevens
Registered Users
Posts:143
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| 09/17/2008 6:31 AM |
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It is possible and many have done it, myself included. I would not recommend it for a DIY, but if one wanted to do it, you need to support the rim board that is holding your TJI's by placing temporary 2x material from the bottom of the rim all the way to the footing (of to the sub-floor below). make sure walls are perfectly plumb and straight before sheeting. All block will settle during the pour so you will need to calculate how much and leave that amount of space free from between the 2x supports and the floor otherwise when it does settle they will hold the floor at one height and the outside will have dropped uneven. Also the top and last course will separate.
I still pour first and attach my floor later. It gets very expensive if you make a mistake doing it this way!!!
Paul Stevens |
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Farmboy
Registered Users
Posts:157
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| 09/18/2008 1:21 AM |
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Paul, "All block will settle during the pour so you will need to calculate how much and leave that amount of space free from between the 2x supports and the floor... "
How might one calculate how much the block will settle? Is there no way to minimize or eliminate the settling by say, glueing each course to the next? Or do the forms actually compress a bit as the concrete falls and pushes on the ties? I plan on pouring the walls before the floors. Dave |
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Paul Stevens
Registered Users
Posts:143
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| 09/18/2008 6:38 AM |
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The foam does compress with the weight of the concrete. It is about 1/8" per course. Before your next pour put some peel and stick waterproofing on the wall and see how it looks after the pour or make a mark on the forms near the top and measure to the footing then measure the distance after. Some blocks settle more than others depending on the density of the foam, sometimes you will need to leave more space over top of the window for that reason. That is an important thing to consider if you are going to install the floor before the pour>
Paul Stevens |
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icfcontractor
Registered Users
Posts:237
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| 09/25/2008 4:20 PM |
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Hey guys,
Here is a link to a project I helped with. This builder is looking for a way to increase productivity on the jobsite, decrease waste, decrease building time while maximizing profits. Seems like every business person's goal. Anyway I told these folks how to properly set up for an ICF monopour of the footings and 32" stem walls plus a rat slab all in a single pour. I coached these guys along and helped them with the pour. It took us two hours to pour out 40 yards worth of footings, stem walls and rat slab. Look at the link, I think they did a geat job, they used the floor joists to brace the wall and the foundation was less than 1/8th inch out of square and was +/- 1/8 of an inch out of level. http://mirandahomes.blogspot.com/
ICF Contractor |
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Aaron McKinney
Registered Users
Posts:44
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| 09/25/2008 10:32 PM |
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| Do you guys know about the Arxx clips? |
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icfcontractor
Registered Users
Posts:237
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| 09/26/2008 1:21 AM |
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Aaron,
In my experience I have had little to no settling of the forms I use. I have seen the ARXX clips and friends of mine find them effective for ARXX and I hear rumor that Logix will soon have a similar clip although I feel they are not needed on their system.
ICF Contractor |
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WhirlWind
Posts:0
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| 09/26/2008 3:43 PM |
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| That sounds a little unorthodox but I will contact my installer who has more than 30 years experience in this area. I will post his comments later today
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Paul Stevens
Registered Users
Posts:143
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| 09/26/2008 8:12 PM |
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The ARXX clips are used to tie the top course to the course below to stop the blocks from floating/lifting when you finish your pour to the top. They have nothing to do with settling. Years ago it was recommended to tape the top to second last course every 16 inches to stop this lift, that has been eliminated due to the Arxx clip. All the jobs I have done with Logix have never lifted, their interlock is really tight! Blocks will all settle depending on their foam density, but don't take my word for it, measure yourself and see. I have said before it is not a HUGE issue when pouring an eight foot wall, once I poured a twelve foot wall with the floor attached and the settling was big enough to hear the blocks unclip, I had braced from rim boar to the floor so there was no room to settle. Just something to consider!!
Paul Stevens
WhirlWind, what is it that sounds 'a little unorthodox'??? |
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Aaron McKinney
Registered Users
Posts:44
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| 09/27/2008 4:43 PM |
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| When working for my old boss, we always accounted for 1/16 settling per row when installing Arxx or similar blocks. After the clips came out and we started using them, we found that it kept the settling down to 1/32 per row. |
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