smooth render over existing large pebble dash render
Anonymous user 03/03/2024 - 3.05 PM
I have a house with very rough external render, about 20 mm thick, and it has large pebbles the size you get for mixing with sand to make concrete. From outside end of a pebble to inside dip in render can be 10 mm. The problem is getting it off. I am smashing the brick before the render comes off.
I am thinking, can I put the base sand cement render over this rough surface to make smoother before using the render in a tub to get my smooth egg shell rendered look I want?
Or can i just use the tub render direct above the old rough render? It looks like it must be a good key, but would need 10 to 15 mm thick to make sure I cover all pebble sticking out.
Are you a tradesperson and able to answer this question?
3/4 thin coats of render if rendered over much of this.
Try building out the worst dipps and indents 1st.
Try a terroline gun and splater evenly over the worst parts 1st then trail it in flat .
Make sure u use s.b.r with a small handful of cement in it. Apply this with a brush b4 any render is applied or you may regret it.
Apply 6 square meters s.b.r then cover with render wen slightly dry continue this all throw the 1st render coat.
S.. b.r will seal / bond and keep suction the same to prevent cracking etc.
There will be low suction on the stone mid/high on the old render.
Answered6 March 2014
1
Anonymous user
hi mick. it's a dubbing or scratch coat with sand and cement you need. the tub render is a acrylic renders, its applied only 1 half mil thick so your top coat needs to be smooth. to get the finish you want.
Answered15 February 2014
0
Anonymous user
Did you think about 50 mm insulation boards and pins? This way you might save more render to cover all that surface and in the same time make it flat for a 6 mm basecoat.
you can either dub it out with sand and cement with a little bit of lime in it or bord it out and render depends on how much you want to spend
Answered28 September 2023
0
Anonymous user
I would suggest looking into a thin coat system. Firstly I would be priming the old render. Then apply in 4 coats. 1st to dub out any hollow areas and then the second with fibre mesh in to add strength. Thirdly a coat to sponge up smooth ready for your top coat. Then use a silicone top coat which will give you your eggshell finish.
