damp proofing

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Doseone

Guru
Location
Brecon
What sort of walls?
 

Fnaar

Smutmaster General
Location
Thumberland
What sort of walls?
Wall's (of) Sausages, of course!!

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(Gets coat, goes to butchers)
 

Cuchilo

Prize winning member X2
Location
London
Outside bridging of the DPC is normally the main cause . Digging a gully and back filling with pea shingle will normally sort the problem out if the internal plaster isn't that bad . Internal rubble under the floor is another problem that bridges the DPC because of lazy people that sweep the rubbish under the floor .
 

asterix

Comrade Member
Location
Limoges or York
Don't forget the air-bricks! You need a good breeze under a suspended floor.

When I had an East Anglian house I found the bricks were very porous and rising damp a problem. I used a silicon based liquid to coat the exterior (it doesn't affect the appearance and internally I drilled holes and injected the same stuff myself. I also lowered external soil levels and coated the concrete kitchen floor with some self-levelling resinous compound, expensive to buy but much cheaper than a new floor and totally effective (for the couple of years I stayed there, anyway!). A damp house became a nice dry one.

Strangely, the French don't go in for DPCs very much as the thinking is to use a building material that discourages damp have good drainage and ventilation. Where walls are contacted by soil you can get vertical dpcs made of moulded plastic and these are very effective.

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sheddy

Squire
Location
Suffolk
Beware of Cowboys.

I believe that the industry has had a bit of a U turn over the effectiveness of Injected DPCs. There might even be some documents online.
As others have said, look for all sources of the problem first.
 
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