bbabythai Posted July 29, 2020 Share Posted July 29, 2020 I had a window removed and put brickworks in and they did cement rendering inside and outside. I will obviously soon be painting the inside. But if I dont get around to doing the outside will the cement render break down eventually and cause dampness/ leaking thanks Link to comment Share on other sites More sharing options...
bankruatsteve Posted July 29, 2020 Share Posted July 29, 2020 It will break down. Maybe not cause any leaks but it will look like cr@p. 1 Link to comment Share on other sites More sharing options...
ThaiFelix Posted July 29, 2020 Share Posted July 29, 2020 Dampness will creep through. We have 2 meter boundary walls surrounding our house. Both sides are rendered, our side is painted with a good quality paint but the neighbours side is not. After the rainy season bubbles the size of 10 baht coins appear under the paint on our side...it is a build up of dampness that has crept through the wall in more porous spots. 1 Link to comment Share on other sites More sharing options...
ravip Posted July 29, 2020 Share Posted July 29, 2020 A coat of waterproofing before painting would help. Link to comment Share on other sites More sharing options...
lopburi3 Posted July 29, 2020 Share Posted July 29, 2020 3 minutes ago, ThaiFelix said: Dampness will creep through. We have 2 meter boundary walls surrounding our house. Both sides are rendered, our side is painted with a good quality paint but the neighbours side is not. After the rainy season bubbles the size of 10 baht coins appear under the paint on our side...it is a build up of dampness that has crept through the wall in more porous spots. Are you sure that is not rising damp from underground? Or both? For OP would make sure to paint it and if not smooth make sure paint can penetrate to fill any voids. We had workers use very poor paint on an outside wall once and over time in can into the room and destroyed inside paint. Unless they used waterproof cement or white cement for render it will leak over time. Link to comment Share on other sites More sharing options...
RJRS1301 Posted July 29, 2020 Share Posted July 29, 2020 (edited) Do not use house paint, use concrete paint, wash the surface, remove all dust particles, a concrete sealer / undercoat then two two top coats for good result Using ordinary house paint is a waste of time and money Edited July 29, 2020 by RJRS1301 2 Link to comment Share on other sites More sharing options...
ThaiFelix Posted July 30, 2020 Share Posted July 30, 2020 On 7/29/2020 at 4:46 PM, lopburi3 said: Are you sure that is not rising damp from underground? Or both? For OP would make sure to paint it and if not smooth make sure paint can penetrate to fill any voids. We had workers use very poor paint on an outside wall once and over time in can into the room and destroyed inside paint. Unless they used waterproof cement or white cement for render it will leak over time. No I doubt its rising damp as all of the bubbles are high up on the walls. There is no bubbles/blisters at all in the lower part. I also have very large ground beams and being solid concrete I would imagine would be difficult for dampness to travel through. That wall also faces the south west where we get the worst of our weather from. If in doubt with anything like this I usually tend to add a lanko product mixed with the render or even in the paint. I cant remember the number but it is a latex similar to Bondcrete we use in Australia. It can also be used to join/cover old cement/concrete with new with great success. Link to comment Share on other sites More sharing options...
ThaiFelix Posted July 30, 2020 Share Posted July 30, 2020 On 7/29/2020 at 4:50 PM, RJRS1301 said: Do not use house paint, use concrete paint, wash the surface, remove all dust particles, a concrete sealer / undercoat then two two top coats for good result Using ordinary house paint is a waste of time and money I used Dulux Weathershield for all my outside and boundary walls and highly recommend it as it still looks like new after 7 years. Link to comment Share on other sites More sharing options...
Beardog Posted August 16, 2020 Share Posted August 16, 2020 I used Dulux Weathershield for all my outside and boundary walls and highly recommend it as it still looks like new after 7 years. Choice of Champions! Link to comment Share on other sites More sharing options...
473geo Posted August 16, 2020 Share Posted August 16, 2020 First use concrete primer, we put two coats, then two coats of exterior paint, still looks good a few years later 1 Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now