Stopping Reddish Brown Streaks on Garden Wall
All manner of questions and solutions to problems and issues surrounding the subject of brickwork, blockwork and stonework

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CTB
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Stopping Reddish Brown Streaks on Garden Wall

by CTB » Mon May 04, 2020 10:58 am

Please see photo of garden wall. How do I stop
It getting streaked with unsightly reddish brown marks on the white wall?

Don’t think the cause is the pointing because it still happens where the pointing is good.

The coping was originally a rusty colour but was over painted with black years ago leaving a reddish black now.

Should I paint it with a sealant or a good masonry paint to stop the streaking? Or am I missing something?

Thanks to anyone who has any ideas. Just painted the wall white again and don’t want the same problem in a few months.
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stoneyboy
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Re: Stopping Reddish Brown Streaks on Garden Wall

by stoneyboy » Mon May 04, 2020 11:05 pm

Hi ctb
Most of the stains are originating from the mortar joins. You could try painting the coping again paying special attention to the joins. However these are likely to crack and in time you will have the same problem.
Regards S

CTB
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Re: Stopping Reddish Brown Streaks on Garden Wall

by CTB » Tue May 05, 2020 7:12 am

Thanks for taking the time to reply Stoneyboy.

Would it help to try and seal it with PVA Bond/Sealer first do you think? And should I use masonry paint or exterior tile paint for the longest lasting finish?

stoneyboy
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Re: Stopping Reddish Brown Streaks on Garden Wall

by stoneyboy » Tue May 05, 2020 10:30 pm

Hi ctb
You could try pva but use the exterior grade.
I would suggest masonry paint but try to find one which,claims to have some flexibility.
Regards S

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