Penetrating damp and black mould on outer wall issue

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mahoak
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Penetrating damp and black mould on outer wall issue

Post by mahoak » Sun Dec 30, 2018 4:34 pm

Our house is brick built in 1953 and rendered. I have noticed that in the kitchen above the window and in the corner above the back door there are two substanital patches which are very damp and with a layer of black mould on them. I have attached a picture of the damage. One of my worries is that there is a steel beam resting next to the worst affected area in the top left of the first picture and I'm not sure if this might cause any damage? Any recommendations with regards to what I can do to fix the damp issue at least on a temporary basis please? I assume that once I have fixed the damp issue I can scrape the plaster on and around the infected area in order to get rid of the black mould and then replatser? The walls on the inside have the proper plaster on them (as opposed to the current method of glueing plasterboards on).

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decdec22
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Re: Penetrating damp and black mould on outer wall issue

Post by decdec22 » Tue Jan 08, 2019 4:41 pm

mahoak wrote:Our house is brick built in 1953 and rendered. I have noticed that in the kitchen above the window and in the corner above the back door there are two substanital patches which are very damp and with a layer of black mould on them. I have attached a picture of the damage. One of my worries is that there is a steel beam resting next to the worst affected area in the top left of the first picture and I'm not sure if this might cause any damage? Any recommendations with regards to what I can do to fix the damp issue at least on a temporary basis please? I assume that once I have fixed the damp issue I can scrape the plaster on and around the infected area in order to get rid of the black mould and then replatser? The walls on the inside have the proper plaster on them (as opposed to the current method of glueing plasterboards on).
Can you remove to plasterboard to see if there is a source of damp air coming in? That might be the source?

I have a theory that the steel beam might be causing dampness.
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Re: Penetrating damp and black mould on outer wall issue

Post by mahoak » Sat Jan 12, 2019 12:44 am

They are not plaster boarded but plastered in the old style. I doubt the steel beam is causing it because we have lived here for 7 years and this is the second year that this happens (and mainly in winter when the rain starts). Plus, the patch in the corner is nowhere near the steel beam. I am thinking of scraping the top layer of plaster in order to remove the mould and then I have got some Zinsser bulls eye 123 primer and some Zinsser Perma white mildew proof paint to go over the area. I'm hoping that would at least sort out the mould temporarily until I manage to get to the cause of the damp.
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