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Plastering & Rendering

Internal plastering / rendering after damp-proofing

Anonymous user 09/03/2024 - 3.29 PM

Hello, Looking for advice as to what plaster / render to use internally after damp-proofing works. We've been given conflicting advice as to whether a new damp-proofing injectable course is needed but have been told that, regardless, the render/plaster will need fully removing on the affected wall and a new render/plaster applied (once bricks have dried). Seeing as we're going back to brick anyway, we're going to DIY the damp-proof course with Dryrod Damp-Proofing Rods. However we will now need to bring someone in to plaster up until the new damp-proof course (not lower to avoid any bridging). We're struggling to find anyone specialised enough to know exactly what mix is needed for the render/plaster. The freeholder is sorting all external works and have advised we'd need to use sand and cement with Sika for the inside. However, what would the ratio be? We won't be attempting this ourselves as we'd have no clue but want to be sure whoever does this is getting the mix right! Scared to just let someone have a go and not knowing until it's too late that it hasn't been done correctly! Any advice? Tia!

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4 Answers

Redevelopment

Rating: 4.8 out of 5

Hounslow

To have a good mix of render plaster to prevent any dump coming from the walls after a successful dump proof injection .a good mix of one bag of cement with three bags of plastering sand Including sika is a water proof solution apply 2 to 3 coats of the mix you just done not in the same day when is dry depending on the weather in a week or so is ready for multi finish .that’s my way of doing this job . Thanks Besnik

Answered27 June 2022

Anonymous user

You could tank the internal wall then use bonding or alternatively dot and dab plasterboard onto the area and then skim straight on top Tanking kits range from £60-200 depending on the length of the roll required.

Answered6 July 2022

N. Anthony plastering

Rating: 5 out of 5

Cheltenham

I would use a weaker mix because of cracking, and that would be a 4 to 1 mix of sand and cement, with waterproofer in both coats, or another option, is to use limelight, or renovating plaster, which lets the wall bread, by not holding the damp in. Nick

Answered20 July 2022

Distinctive Plasterers

Rating: 5 out of 5

Stoke On Trent

5 and 1 is a better mix less chance of cracking inside when heating goes on Plastering sand less salts sika waterproofer with a salt neutralizer added to the mix in correct ratios rendering can be done in a day depends on the thickness needed if it's thick it might have to be done over 2 days multi finish after it's cured for a week

Answered28 July 2022