Rendering query
Discussion
My house was built in the '60s from concrete common brick. For years it was painted white, then someone applied some sort of textured white polymer coating over the paint. As time went on the coating began to flake off , so subsequent occupiers painted over it again. Eventually tired of re-painting another occupier had the house pebble-dashed. And then someone painted over that!
When I moved in it looked OK, but there were hidden problems. Because of the layers of paint and polymer underneath, the pebble-dashing wasn't properly keyed to the brickwork. Seven years of weathering and it's now falling off in big patches, bringing with it some or all of the paint and polymer coats.
My own feeling is that if all the pebble dash is knocked of, I should get it sandblasted back to bare brick, to provide a key for the new render. I realise that this is an expensive option. A plasterer who has come to look at the job has suggested keying the brickwork with an angle grinder, as an alternative to sand blasting. He's talking about digging out some of the mortar joints in the brickwork and diagonally cross hatching the brickwork.
Would appreciate the views of any plasterers/builders on here
When I moved in it looked OK, but there were hidden problems. Because of the layers of paint and polymer underneath, the pebble-dashing wasn't properly keyed to the brickwork. Seven years of weathering and it's now falling off in big patches, bringing with it some or all of the paint and polymer coats.
My own feeling is that if all the pebble dash is knocked of, I should get it sandblasted back to bare brick, to provide a key for the new render. I realise that this is an expensive option. A plasterer who has come to look at the job has suggested keying the brickwork with an angle grinder, as an alternative to sand blasting. He's talking about digging out some of the mortar joints in the brickwork and diagonally cross hatching the brickwork.
Would appreciate the views of any plasterers/builders on here
GreenDog said:
FlossyThePig said:
GreenDog said:
saleen836 said:
Alot easier to use a 'scabbler' this will take off loose paint etc and give a key for new render.
What's a scabbler ? 
http://www.refina.co.uk/powerprep.php?gclid=CPH0iv...
sparkythecat said:
saleen836 said:
Alot easier to use a 'scabbler' this will take off loose paint etc and give a key for new render.
Thanks for that, I'd never heard of a scrabbler before.What are they like to use, in terms of noise, dust and vibration?
Sandblasting! Who on earth recommended that? If it is rebdred concrete block then the best thing to do is get the largets bolster chisel you can and hack it off with a hammer. You will be amazed how easily it comes off. While its off consider having your cavity walls insulated (save mess for future) the unibond the walls and re-render. When rendered give it a loose coat of masonary paint followed by two good coats of a quality masonary paint.
The existing pebbledashing comes off fairly easily, but what's left underneath are the patchy undercoats of paint, and polymer coating. It is these coatings the sandblasting was intended to clean off the brick, so the new render would stick. A bolster isn't really the right tool with which to clean paint off a wall.
Cavity wall insulation is a good idea, but it's already been done.
Cavity wall insulation is a good idea, but it's already been done.
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