Old wall in extension. How to patch up?

30 Dec 2008
Reaction score
United Kingdom
What was our old utility space will become a downstairs loo as part of a rear extension. Most of the extension will be dot and dabbed then taped and filled. I'm left with a few tricky bits where new meets old.

The slope of blocks at the top are set back about 50mm, then there is bare brick and the rest of the wall if render and plaster (I think). Its about 6-10mm of blackish render(?) and a skim of plaster.

I'm very keen to leave the boiler and plumbing where it is so ideally want to cover the brick and block to blend in with the existing plaster. What's the best way to go about this?

I'm thinking dab some plasterboard over the blocks. Then render or bonding plaster over the brick to level with the plaster board and 3mm or so below the finished section. Then a multifinish skim to level with the finished section.

How does that sound?
Render, bonding, browning, something else?
Any treatment on the wall first (PVA, SBR)?
What are my chances of success, or will I need a very big picture to cover the lot?

Sponsored Links
If the existing plaster is 50mm proud dot and dab some 35mm thermal board to the brick work leaving it 3mm recessed to allow for the skim.

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local

Sponsored Links