Damp proofing a wall, best way to apply sand 7 cement render & finishing plaster?

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kentnewbie

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Hi All, this is my first post so don't bite my head off!:rolleyes)

I've got a damp patch on my living room wall. It was caused by a leaking down-pipe and as the house is old with lime mortar, it soon came through.

So, I've hacked off the old sand & cement render & plaster skim to the recommended 1 mtr high and have used some Dry Zone damp-proofing chemical along the mortar course, [9" solid wall, but I can only get into the first brick thickness as my drill isn't long enough but if that s the internal skin anyway then I reckon that will do the trick?]

So far, so good then, but, I also bought some of their 'Renderguard Gold' stuff which has to be mixed in with the new sand & cement render so as to prevent future problems. My question is then, how long do I wait before the new render can be applied [its a 1 mtr tall by 15' long area] and once that's cured, how long before i can apply new plaster? I'm assuming that I can use a multifinish plaster, or is there a specialist plaster that should be used instead?

Sorry if I've over-complicated this post, but i hope you get the idea of what I'm on about:RpS_biggrin:

Kentnewbie
 
You shouldnt need to inject the wall and re render if the damp was caused by a leaking drain pipe. sort the leaking drain pipe.dry out the wall and crack on. Why dont you tell us where your are from and maybe someone off the forum can come and have alook and give you some proper advice. as it sounds like you've been mis-informed if your injecting a liquid DPC...............
welcome to the forum by the way................:RpS_thumbup:
 
Do you think i should have took the piss abit first keith then give him the advice.......just for comedy value obviously..............:RpS_thumbup:
 
The best way to apply the new sand and cement render is by trowel and hawk. :RpS_thumbup:
 
There ya go keith........carlos has beat us too it............:RpS_sneaky:
and dont listen to carlos, kent, its called a hand board.......:RpS_thumbup:
 
Thanks for the replies.

I have fixed the down-pipe, this time last year in fact, but the wall still felt damp to the touch, hence my doing what I've done. That said, I have found [yesterday in fact]that the concrete flaunching thats been put around the underground drainage pipe where the rainwater down-pipe goes into it was in fact touching the outer wall, adjacent to the damp area so I'm now wondering if that has breached the dpc [its an old house so there might not be a dpc anyway] so i shall remove that so that it is away from the wall and I'll do what you suggest regarding the new rendering, and hopefully, that will sort things out.

Thanks again everyone! :RpS_biggrin:
 
The render probably needs to come off as it could be hydroscopic i.e absorbing water especially through condensation. The damp has ruined the plaster.
 
kentnewbie said:
Thanks for the replies.

I have fixed the down-pipe, this time last year in fact, but the wall still felt damp to the touch, hence my doing what I've done. That said, I have found [yesterday in fact]that the concrete flaunching thats been put around the underground drainage pipe where the rainwater down-pipe goes into it was in fact touching the outer wall, adjacent to the damp area so I'm now wondering if that has breached the dpc [its an old house so there might not be a dpc anyway] so i shall remove that so that it is away from the wall and I'll do what you suggest regarding the new rendering, and hopefully, that will sort things out.

Thanks again everyone! :RpS_biggrin:
Click to expand...

If you fixed the down pipe...water coming 'down' why would you use a chemical dpc for water rising up?
 
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