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Bricklaying & Repointing

rendering outside brick and breeze block wall

Anonymous user 01/03/2024 - 3.00 PM

i have a outside retaining wall of breeze blocks and topped off with drive way bricks.the whole wall is painted.but i would like to render it all up now.can i make deep scratches into the breeeze blocks and bricks then render over it all so render stays on.also i only have sharp sand and building sand.thankyou for everyone who may help me.will the render take onto the painted wall.it gets painted every year. can i take put unibond on it then render.and thankyou mag2 constution ltd.

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4 Answers

Mag2 Construction Ltd

Rating: 5 out of 5

Folkestone

Hi, blocks and bricks are made to take render just give them a coat of unibond mixed 50-50 with water if it’s an old wall Don’t use sharp sand it will never stick, use plastering sand. Hope this helps

Answered27 February 2023

Blue Sky Home Improvements

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Liverpool

You can’t render over a painted surface, it’s possible but the problems will always outway the end result. Using a roll of expanded metal lath will help you get a decent scratch coat, then you’ll get a good top coat finish.

Answered28 February 2023

Anonymous user

Don’t use pva and certainly don’t water it down for a first coat, use a good sbr first or mix sbr and pva 50/50, remove any loose paint and at least try a wire brush on it or a power washer, no sharp sand unless it’s to make a slurry wash

Answered12 March 2023

M.Construction

Rating: 4.7 out of 5

Lewes

Any painted surfaces scratch through paint. SBR on damp ,not soaking wall then second coat of 50/50 Sbr. Use all plastering sand on all coats . 5:1:1 on scratch coat then 4:1/2:;1 with waterproofing agent in ready for wooden float rubbed up surface.

Answered14 March 2023