Help and advice

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Padajac

New Member
I would be very grateful for and advice on the following problem
I had a single storey extention built last year and the initial scratch coat was done in sections in December last year and the second coat was done in late jan/ early Feb. Large sections of the render are now blown, and after speaking to the builder he is saying it is because I have not painted it? I have chipped a bit off and the outside coat is very hard but the inside scratch coat is like powder/sand and poured out the hole I made.
I would be grateful for any opinions or advise.
 
Padajac said:
I would be very grateful for and advice on the following problem
I had a single storey extention built last year and the initial scratch coat was done in sections in December last year and the second coat was done in late jan/ early Feb. Large sections of the render are now blown, and after speaking to the builder he is saying it is because I have not painted it? I have chipped a bit off and the outside coat is very hard but the inside scratch coat is like powder/sand and poured out the hole I made.
I would be grateful for any opinions or advise.
Click to expand...
Painting it would not stop the scratch coat from being dead . Sounds like crap sand or a weak mix in the first coat .
 
Padajac said:
I would be very grateful for and advice on the following problem
I had a single storey extention built last year and the initial scratch coat was done in sections in December last year and the second coat was done in late jan/ early Feb. Large sections of the render are now blown, and after speaking to the builder he is saying it is because I have not painted it? I have chipped a bit off and the outside coat is very hard but the inside scratch coat is like powder/sand and poured out the hole I made.
I would be grateful for any opinions or advise.
Click to expand...

"Poured out the hole I made."

Please tell me that's a typo!!?? [emoji23][emoji23][emoji23]


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Pug said:
Is it possible a frost got to the scratch coat?
Click to expand...
Sounds like pug says...frost, maybe a weak mix and even wrong sand as it was done piecemeal. Get it off, and start again. Was it a plasterer that did the work or the builder? Someone on here will be able to put you onto a decent spread depending on your location.
 
Dropsalot said:
Sounds like pug says...frost, maybe a weak mix and even wrong sand as it was done piecemeal. Get it off, and start again. Was it a plasterer that did the work or the builder? Someone on here will be able to put you onto a decent spread depending on your location.
Click to expand...
 
I agree. I think frost is the cause, but the builder is saying that the render failed because I didn't paint it straight away and left it exposed to the elements.
 
Your builder's not giving the correct info there. If it was frosty or below 0°c while it was curing (24hrs or so) it would cause it to fail. Once it's cured the weather wouldn't make any difference.
 
Just to add if it's failed because you haven't painted it then why is the top coat dense and the bottom coat soft as s**t?
It would be the other way round if it's because it's not been painted.


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Not being funny but 100% near enough guaranteed that the builder did this rendering.. As soon as I read first post I knew it..

Sorry your rendering is failing, I looked at a similar quote last week with same story , imo they both to blame customer and builder,
Smash the lot off and get plasterer to do it.
 
Padajac said:
I agree. I think frost is the cause, but the builder is saying that the render failed because I didn't paint it straight away and left it exposed to the elements.
Click to expand...
Sounds like the builder is trying to pull the wool over your eyes.
As others have said it sounds like frost got to it.
 
you are welcome mate. let us know how you resolve the problem. come back here to get a reputable spread for your job, or at least a reccomendation.
 
I do not beleive this is due to frost. Most of the water would have been absorbed into the substrate leaving little to freeze. What would have been left the air entrainer could handle.

This will be down to a bad mix or practice. Lots of ways to fail, wrong sand (most likely), too much chemical, too thin and high suction leaving no water to set and cure.

Was it on Celcons? High suction blocks?

Don't accept that painting crap, render can be left untreated. I am hacking off naked render facing the peak district thats been on for 70 years!
 
A long time ago I saw a similar thing happen when blue circle mastercrete came out. Guy on the mixer added Feb to the mix (but it was not required) after it was on the wall and dry it turned to powder.
other times I have seen the top coat come away from the scratch because of frost.
 
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