Dpm - Why do i need it

All forms of block paving, brick paving, flexible or rigid, concrete or clays, new construction or renovation
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Dickjall
Posts: 3
Joined: Mon Mar 21, 2005 9:36 pm
Location: Norwich

Post: # 8187Post Dickjall

I see the specification for rigid paving is for a DPM under the concrete sub base. But why, is it really necessary?
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InfAddict
Posts: 61
Joined: Mon Apr 05, 2004 8:58 pm
Location: South Shields

Post: # 8192Post InfAddict

Hi, have you consulted the main website as instructed at the top of the page and in the Noticeboard forum?... it really does contain most of the answers you require.

Try here : FAQ - Do I need a membrane?

and here : Geo-fabrics
"I have a plan so cunning you could stick a tail on it and call it a weasel." - Edmund Blackadder III.
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Tony McC
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Joined: Mon Jul 05, 2004 7:27 pm
Location: Warrington, People's Republic of South Lancashire
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Post: # 8373Post Tony McC

There are two basic reasons why a DPM should be used benath a concrete slab and these are outlined on the Concrete Hardstandings page, but to summarise....

1 - prevents loss of mix water and so maintains correct w/c ratio while concrete undergoes initial cure

2 - protects underside of cured slab from attack by aggressive groundwater.
Site Agent - Pavingexpert
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