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Some mouldy lath - should i expose more?

I was hoping to repair some cracks in a bathroom wall after dodgy gutters led to a lot of water coming in. Big areas of plaster very quickly came away. In one spot I have exposed the wooden lath and it's damp to touch and mouldy.

The bit I can see doesn't seem to have rotted through - tried pushing a craft knife at it and it's still strong.

At this point, should I...
A) expose more to see how bad it is?
B) let the bit exposed dry, clean off the mould then plaster over? (Small enough that this is still doable)
C) give up and call in an expert

For info - around the edges of the hole/crack I've made the plaster layers are slightly separating from each other (i.e. a stripping knife can get between them in parts) with signs of mould inbetween. But plenty of plaster still on the wall so keen not to take the whole lot off.

Thanks in advance for advice.

2 Answers from MyBuilder Plasterers

Hi there
hack back till you have exposed all damp areas of lathe , let it dry out ,treat against rot then re-plaster,if you are not confident then call in damp and wood remedial company .


Answered 15th Jan 2013

Hi there, you need to strip back the damp areas and clean off any mould and allow this area to full dry out before repairing ( a dehumidifier will speed this up). Then you can repair the plaster. I hope this was helpful. CJ's Building


Answered 15th Jan 2013

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