How to damproof a soil retaining wall

having_a_gas · 7 Mar 2009

Hope someone can offer some advice (other than "don't do it, you mad"!)

We are about to build a conservatory in to a sloping garden, rather than have a path with a retaining wall holding back the garden. I thought about having a dwarf wall to the conservatory, approx 600mm high, and would like the garden to be up against it.

From what I can find on goggle, you take a continuous membrane from under the slab and up the outside of the wall to damproof. Any recommendations on what products are best and methods to use?

Thanks

^woody^ · 7 Mar 2009

Something from Marley such as Superprufe or from RIW (.co.uk).

Coat the outside face, or if a cavity wall, have the outer face in engineering bricks and coat the back of this with the waterproofer, then insulate and form the inner wall.

You will need careful detailing of the wall/floor junction and will need to provide for dealing with or preventing condensation dampness within the wall due to the cold earth against the outside of it.

Otherwise, just google for " basement tanking " to get an idea

Thermo · 7 Mar 2009

did a similar thing with our conservatory when i built it 6 years ago. The existing retaining wall was brick built. I did the following:-

coated the wall with copious amounts of riw.
then laid a dpm against it up from the new floor slab.
plenty of polystyrene sheet insulation against the dpm
left a cavity
built a blockwork wall
more riw on that wall.
plasterboarded over that.

not one problem with any form of damp since i did it.

having_a_gas · 12 Mar 2009

Thanks for your replies.

jeepman · 21 Mar 2009

look up www.bluebaybp.co.uk they got loads of things on there that will help you out

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How to damproof a soil retaining wall

having_a_gas

^woody^

Thermo

having_a_gas

jeepman

DIYnot Local

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