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Triassic

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Because our site was on a slope we always envisaged having a walk-in basement, that’s a basement surrounded on three sides by the slope and open at the front to a lawned area. The architect recommended a structural engineer to design the basement walls, what I hadn’t realised until it was too late, was that the design would be way over-engineered. His design is for a 200mm thick steel reinforced poured concrete wall tied into the basement slab. The slab and retaining wall contains about 52m3 of concrete and 3.5 tonnes of steel. The only saving grace is that it sits on an insulated raft designed by Hilliard Tanner and has UFH pipes cast into the concrete. 

 

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So here we are just about to start pumping the concrete into the insulated slab.

 

Next, the ICF basement walls were put together, a bit like Lego.

Here you can see the completed walls braced and ready to receive 26m3 of concrete.

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Finally, the lounge section of our insulated raft foundation was done to complete the three-stage foundation project. In this photo, you can see the insulated raft and its steel ring beam under construction.

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Bitpipe

Looks great !

 

I'll see your 200mm thick basement walls and raise you a 300mm thick wall and slab with 12.5 tonnes of rebar and 111m3 waterproof concrete :)

 

Edited by Bitpipe
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iSelfBuild

This brings back memories of our retaining wall! Good luck with the first pour, I hope it goes better than ours did!!!

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Triassic

We've completed all the concrete work now. Luckily I managed to borrow, free of charge, a full set of ICF wall props, thus saving me around £300 in hire costs. I popped the walls as recommended by the ICF manufacturer, but added extras made out of recycled floor joists and bits of off-cut timber. I wasn't taking any chances !!

 

Sat here pondering the TF arrival! I need scaffolding, but my local scaffold companies are a bit slow in pricing for the work.

Edited by Triassic
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Pete

Give Paul a ring at On Target Scaffold. Helpful and you can have it for as long as you need it.

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bissoejosh

Good work, looks great. Is that Amvic ICF? How did you find it, any problems with the product?

Edited by bissoejosh
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Triassic

Yes Amvic, great product, Easy to use on site. Easy to cut. Quick to install. Average customer service. No help at all with the temporary props needed for the pour, along the lines of, "oh all our props are out, you'll just have to wait for some top come free", how long? Don't know. Then I get a call to say there are some free on a site four miles from mine, but "you'll have arrange your own transport". Get there to be told there are no Amvic props on site as they'd been returned a couple of weeks previously.  The good thing that came out of this was the site agent, having heard my problems and delays, loaded me his homemade steel props free! Result! Saved me £300 in hire charges.

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bissoejosh

Thanks, did you opt for the standard insulation thickness and then the fix separately sourced EPS on the outside (third pic?)?

If we get permission on our second site I'm seriously considering ICF.

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vivienz

My experience of SEs and piles is that they tend to over engineer, often without a thought to cost constraints so never be afraid to question them.

 

The formwork looks great and it's coming on at a pace. Lovely job.

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