gravelrash Posted February 17, 2021 Share Posted February 17, 2021 I gave my SE Kore design pdf written by Tanner engineering with regard to one of his designs-see images. Got back a design with strip footing at 800 x300, ring beam at 450 x 300 and main slab as 150 deep which reduces insulation + only 7mm mesh rebar! ...but no calcs. The ground is firm clay/mudstone so no issues with loading. Should I push for him to do full calcs as it appears he has just drawn what he knows will work structurally. any advice grateful Kore_Insulated_Foundations_Report 12.pdf 21-093.01 Structural Plans and Details (A1).pdf Link to comment Share on other sites More sharing options...
PeterW Posted February 17, 2021 Share Posted February 17, 2021 Your engineer doesn’t understand how a passive slab works. He’s using the strips as a bearing for the edge of the slab as though it was a beam. Link to comment Share on other sites More sharing options...
Conor Posted February 17, 2021 Share Posted February 17, 2021 (edited) This is what we ended up with from our SE as a passive slab has it's limits (also on good ground, firm red clay). We are an ICF basement with 1.5 stories above. We abandoned the passive slab idea as we were exceeding the limits of what EPS and a simple slab can do. Ended up with a 200mm ground bearing slab with two layers of mesh with a 300mm x 600mm ring beam with extra rebar. Worked out a lot simpler and cheaper than a passive slab with the extra footings and higher grade EPS that would have been required. As we are using ICF directly off the slab and 200mm floor insulation, there's no cold bridging and it's well insulated. Passive slab is great if you have a light building, not so much it's it's a big heavy building like ours. Edited February 17, 2021 by Conor Link to comment Share on other sites More sharing options...
gravelrash Posted February 19, 2021 Author Share Posted February 19, 2021 Single storey with Ridge height at 3.2m so not a heavy weight...unless he thinks the mass in the floor will stop it blowing away. Link to comment Share on other sites More sharing options...
ToughButterCup Posted February 19, 2021 Share Posted February 19, 2021 On 17/02/2021 at 11:52, PeterW said: Your engineer doesn’t understand how a passive slab works. ... Common ? Link to comment Share on other sites More sharing options...
PeterW Posted February 21, 2021 Share Posted February 21, 2021 On 19/02/2021 at 09:20, ToughButterCup said: Common ? Common misunderstanding ..? Most likely as they are unusual. But for a single storey building with a pretty decent ground below there isn’t really a need for anything complex. Not quite sure why he thickens the width on the secondary footing as that’s not a detail you need for what is essentially a single skin brick wall. @gravelrash have you gone back and asked the question ..? Link to comment Share on other sites More sharing options...
gravelrash Posted February 21, 2021 Author Share Posted February 21, 2021 latest email from SE blames need for wide strip footing on non flexing wall ties and any differential movement...He never thought to ask for spec on basalt wall ties! So will see how he deals with having details. Link to comment Share on other sites More sharing options...
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