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Plastering & Rendering

damp on external wall in upstairs bedroom (1920s terrace with solid brick walls)

Anonymous user 28/02/2024 - 3.08 PM

We have had a problem with some damp on an external wall in an upstairs bedroom for a couple of years now. The wall is facing south west and experiences the full blast from wind and rain! The property is a 1920's terrace with solid brick walls. We had the entire rear elevation hacked off and rerendered and dashee over 6 months ago and papered the wall inside with a vinyl wallcovering over lining paper. Recently the damp has reappeared, leaving black mould stains between the lining paper and the wallpaper along the length of one wall to the side of the window. It is a warm well ventillated room. I have stripped back some of the paper to expose the plaster, some of which had become loose. The paper was very damp but the render beneath the plaster is mostly sound. Any ideas? Could it be the moisture in the wall still coming through and getting trapped under the wallcovering?

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2 Answers

Anonymous user

Obviously with it being upstairs it will not be rising damp.. Penetrating damp can be caused by a few things.. Either lack of ventilation, leaking from the roofinto the cavity or like you say penetrating through the external wall. My advice would be solve the problem which is causing the damp then think about having it re-plastered.. As re-plastering it is just a temporary fix and no doubt the damp will come back through.. Once the damp problem is sorted . it may then be a good idea to have it plaster as the damp plaster can get infected
Answered8 January 2015
1

ADR Property Maintenance

Rating: 5 out of 5
Boston
unfortunately unless you have had it re-rendered with a N.H.L render which will allow the walls to breathe, you will only have sealed the walls which will make any water ingress worse, check the seal around the window, the gutter felt, any cracks in the render, broken/cracked roof tiles to name a few causes. or get a local tradesman round to check the cause, preferable one that is used to working on older property's. good luck Alex
Answered8 March 2015
1