Building a slab

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silverbirch
Posts: 1
Joined: Mon Jan 28, 2008 5:59 pm
Location: cambs

Post: # 25535Post silverbirch

Hi All

Another novice here.

I have to build a 16m x 4m slab to situate a timber built cattery on. I've been led to believe that a DPM is not required or needed as the slab is open to the elements. The slab will have a limestone hardcore.

Is this the case or should I use a DPM?

Many Thanks
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seanandruby
Site Admin
Posts: 4713
Joined: Mon Jun 26, 2006 11:01 am
Location: eastbourne

Post: # 25541Post seanandruby

D P M yes. the idea of a membrane is to stop the sub base sucking the water out thereby weakening the slab.
sean
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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: # 25570Post Tony McC

There should ALWAYS be a DPM beneath concrete. I've never yet heard a good argument to omit it.
Site Agent - Pavingexpert
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