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Help with damp-proofing
 Started by  frankos65
 14 Jan 2010, 1:05 PM

I have an old cow shed I am turning into a home, it has 9 inch solid wall with old lime mortar but has no DPC or DPM in the old concrete floor and has damp, I am going to get rid of the old concrete floor and install new hardcore, insulation and a 1000 gauge DPM then a screed.
But i need to install a DPC into the brickwork and I am not sure how to join the DPC and DPM up so i donít have a gap anywhere. I thought about chemical DPC injected in from outside but this might be hit and miss and wont bind with the DPM as i can see.
Is it best to cut out the mortar in sections and thread the DPM through from the interior then add a DPC solution to bind, then add a new lime mortar.
Before anyone asks, a cavity wall install is a no no and its staying solid wall.
I will add a lime render to the exterior, and plasterboard on dabs to the interior walls, insulated sandwich board such as British Gypsum Thermadeck Super.
Is there a better solution for the walls i am suggesting.
Any advice would be great

With lime mortar you may well be OK without a dpc. You could borrow a diamond chainsaw and cut in a slate one? 300mm at a time and the wall kind of drops into place as you go.
Chemical is a waste of time.
dot and dab is one of my pet hates -- you can get outdoor air and wind moving about behind it all and getting into the building making it draughty and defeating the point of the insulation so watch out for that.
fully bed on the wall boards to avoid this.
Preventing rising damp is pretty easy. If dampness appears on the wall, the first step is to check for leaking pipes, downpipes or waste pipes that may be feeding water on to the walls. If there are condensation sources get rid of them and make sure that enclosed spaces have some ventilation in particular cupboards under the stairs, larders off the kitchen, bedroom, wardrobes and lofts. The serious problem arises when it is left untreated as it can cause mould, crumbling brickwork, cracked render and the most serious structural instability. It is better to take a professional advice as they thoroughly check the situation and provide the advice according to that. Rising damp is to be treated at an early stage.


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