TonyMorris Posted March 30, 2023 Posted March 30, 2023 I have a white wall that surrounds the base of a tree. The paint started bubbling so I stripped it back, filled it, used stain block and used masonry paint. It looked great for a few weeks and now it’s yellow and damp once more. What else should I do!? I don’t mind a bodge that needs redoing every year or two, but every few weeks is too much! I think it’ll always be damp… 😬 any advice appreciated!
nod Posted March 30, 2023 Posted March 30, 2023 I find that oil based undercoat works a treat Two coats a day apart
SteamyTea Posted March 30, 2023 Posted March 30, 2023 Dig all the dirt out, line with several millimeters of GRP. Then, after a month, put the dirt back in. Leave for several years for the wall to dry properly. Then repaint. Probably won't work. You could try the opposite. GRP the outside and hope it is not too damp to stick to the wall. 1
SteamyTea Posted March 30, 2023 Posted March 30, 2023 (edited) 14 minutes ago, ETC said: Paint it black. Works for me. Edited March 30, 2023 by SteamyTea
Nickfromwales Posted March 30, 2023 Posted March 30, 2023 2 hours ago, TonyMorris said: I have a white wall that surrounds the base of a tree. The paint started bubbling so I stripped it back, filled it, used stain block and used masonry paint. It looked great for a few weeks and now it’s yellow and damp once more. What else should I do!? I don’t mind a bodge that needs redoing every year or two, but every few weeks is too much! I think it’ll always be damp… 😬 any advice appreciated! Hi. What is that 'planter' made out of? Breeze block? Is there any liner inside it, and is there drainage for when it's raining?
TonyMorris Posted March 30, 2023 Author Posted March 30, 2023 25 minutes ago, Nickfromwales said: Hi. What is that 'planter' made out of? Breeze block? Is there any liner inside it, and is there drainage for when it's raining? Hi, it was done by the previous owners so I’m not sure - but I’d presume soil drainage (the tree is huge) and no liner. Thanks!
Nickfromwales Posted March 30, 2023 Posted March 30, 2023 Just now, TonyMorris said: Hi, it was done by the previous owners so I’m not sure - but I’d presume soil drainage (the tree is huge) and no liner. Thanks! It's probably block then, which is like a teabag. Take all the paint off, scratch it up, and apply a new layer of waterproofed render. Maybe that would hold the damp from getting to the back of the paint.
Temp Posted March 30, 2023 Posted March 30, 2023 Either.. Dig out and paint the inside with a liquid tanking medium as used for basements right to the bottom. Then eventually the wall should dry out enough to allow paint to survive. Or.. Build another wall around it with a cavity between. Bottom course in engineering bricks with empty perps for drainage and a DPC on top. Put paving slabs or similar on top of the wall to cover the cavity? 1
Radian Posted March 30, 2023 Posted March 30, 2023 You can get a composite geotextile which doesn't take up much space but creates a vertical drain at the sides. Often used in basements but also good for planters or retaining walls. . 1
TonyMorris Posted March 30, 2023 Author Posted March 30, 2023 Thanks! To avoid a more serious effort might something like this work? Polar Premium Leak Seal Grey Paint - 1 Litre - Instant Waterproof Roof Sealant - Ideal for Leaks, Cracks & Roof Repair - Concrete, Brick, Metal, Drainpipes & Gutters - Easy to Apply https://amzn.eu/d/bPLytpJ
Dave Jones Posted March 31, 2023 Posted March 31, 2023 a mornings work dig out a channel behind the wall, blackjack it, dpm then backfill with pea gravel.
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