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Ask The Trades › DIY Forum › Painting, Decorating & Tiling Questions › Stains in paint and plaster

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Stains in paint and plaster (Read 5020 times)

Porkerspalace Newbie Offline Ask The Trades Posts: 2 Total Thanks: 0 For This Post: 0	Stains in paint and plaster Nov 4^th, 2017, 11:23pm Could anyone advise on these stains? I have had them come through for years! The plaster has been removed, new plasterboard and plaster has been put on but they reappeared. The walls, stone and plaster are completely dry, no water or damp found. The stains seem to grow in size!
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thescruff Global Moderator Trade Member Author Offline Who said plumbing was easy. Posts: 6037 Total Thanks: 147 For This Post: 1 Gender: Trade: Plumber	Re: Stains in paint and plaster Reply #1 - Nov 5^th, 2017, 8:37am What is the room used for. ? What is the other side of the walls. ? Have you tried a stain block. ?
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woodsmith

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Re: Stains in paint and plaster
Reply #2 - Nov 5^th, 2017, 9:00am

Is it a stain or is it damp? If you can get access to a multimeter, they are only cheap if you get a simple one from Maplins, put it on ohms and push the pins of the leads against the wall. If the wall is dry you will get no reading, if it's damp the needle will swing across.

It looks odd to me though, like something is getting onto the surface rather than coming out from behind. If it's not damp then stain block may well work.

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Porkerspalace

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Re: Stains in paint and plaster
Reply #3 - Nov 5^th, 2017, 11:20am

One is the hallway, the other is a bedroom.

The walls behind do not have these stains.

It's a stone cottage with insulation boards in a frame then plasterboard before plaster then paint.

I have tried a stain block and it still came through. Removed the stained parts of the wall and no dampness was found. The walls were then re done and the stains appeared again.

The stains are both halfway up each wall.

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thescruff Global Moderator Trade Member Author Offline Who said plumbing was easy. Posts: 6037 Total Thanks: 147 For This Post: 0 Gender: Trade: Plumber	Re: Stains in paint and plaster Reply #4 - Nov 5^th, 2017, 6:54pm Certainly looks damp with signs of mildew, also looks to be on the joint of the board. can you test it as per Woodsmiths post. Could it be condensation behind the stud wall. Did you fit a vapour barrier when you re-boarded
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CWatters Super Member Offline "Daddy fick it" says James Posts: 5150 Total Thanks: 58 For This Post: 0 Gender:	Re: Stains in paint and plaster Reply #5 - Nov 6^th, 2017, 8:06am Is the insulation in the wall pushed to the other side of the wall leaving a small void on this side? Then perhaps cold air is getting into the void somewhere like the loft and causing condensation at joints ?
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