Concrete slab extension

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Phil H
Posts: 11
Joined: Mon May 01, 2006 9:32 pm
Location: Herts

Post: # 11767Post Phil H

I have an existing slabe (previously used as a base for a 6x8 shed) 6 inch thick on hardcore looking at side excavation. I want to increase this to 10x 10 and raise by around 4 inch the measurements would by around 1 foot extra on 2 sides and the balance on the other 2 so basically not extending equally on all sides. it is noted that the original slab has had no DPM fitted, i was hopping to include this on this rework. My first question is it advisable and ok to enlarge the slab in this way and secoudly would i be able to put the dpm in over the original slab, or could i get away with out it.
I am wanting to build a timber workshop on it and am not sure if i should have a timer floor or use the slabe as it.
Hope you can steer me on the right line here.
Look forward to your reply
Regards
Phil
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Tony McC
Site Admin
Posts: 8346
Joined: Mon Jul 05, 2004 7:27 pm
Location: Warrington, People's Republic of South Lancashire
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Post: # 11800Post Tony McC

No problem casting over the existing slab, and the DPM can be laid over it, so that it extends beneath the whole of the new slab.
Site Agent - Pavingexpert
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