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I was thinking of something like this to protect it.

Aye fair point. i'll either raise the internal floor level to allow decent insulation and thicker/screed, or just put the DPM under the slab rather than under the screed. Cheers.

Thanks for that. Of course the screed could crack, any suggestions as to why you think it would? I could always throw some mesh in. Why do you think the insulation is pointless? Surely it wouldn't be as cold as the slab itself if sitting on it with your arse???

I totally agree with you. It's just that the work to put the slab in was already done before i posted the original question. I left all that out in the first post as i didn't want to bore everyone with detail. Hence, already commited to a slab. :) I checked to see if BC wanted to see the...

Noseall: There was an existing garage which was crumbling/leaking with an asbestos roof which i demolished. Once i broke up the original slab, which was not even 100mm thick. I then tried digging out the original hardcore to reduce the level a little. This hardcore was in excellent condition...

Thanks for all the replies! I understand that strip footings are more practical and offer a better solution. But given the lack of time i have to do the work, which is about 8hrs a week if im lucky (how long to hand dig strips for a 6m x 3m garage?), and on a shoe string budget. I had to go...

Thanks for a swift reply. Only problem is i'd be reducing the depth of my slab at the edges to 150mm if i read you right? Would this not undermine the ability of the slab to hold the weight of the building? It is fairly stiff clay underneath mind (150mm 2" crusher run/hardcore mix under the...

Hi there. First post! I'm currently in the process of attempting to design/build a new garage at home. I've opted for a rc slab with the brick/blockwork commencing at the top of the slab which is roughly ground level also. What is the best way to lay/route the DPM? I originally thought...