Rendering cracked all over, help

[Danielasker]

Need some advice, having all external rendered with sand and cement , the first two sides completed have hairline cracks all over.
the surface is mainly brickwork and some block work , they applied rendaid first, then applied one coat of sand and cement ( red building sand with premium cement) with mesh and floated it up, surely even with rendaid applied first you still need a scratchcoat then a top coat ?

 

[jesssop]

Got any pics?

 

[johniosaif]

Need some advice, having all external rendered with sand and cement , the first two sides completed have hairline cracks all over.
the surface is mainly brickwork and some block work , they applied rendaid first, then applied one coat of sand and cement ( red building sand with premium cement) with mesh and floated it up, surely even with rendaid applied first you still need a scratchcoat then a top coat ?

Sounds iffy,

 

[church]

building sand :RpS_scared:

 

[johniosaif]

If rend aid was used why not ocr ?

 

[user__removed]

Why was building sand used that is bound to be disastrous.

 

[jesssop]

If rend aid was used why not ocr ?

the last render job i did was s/c over rend aid the customer wanted it that way

 

[Olican]

Need some advice, having all external rendered with sand and cement , the first two sides completed have hairline cracks all over.
the surface is mainly brickwork and some block work , they applied rendaid first, then applied one coat of sand and cement ( red building sand with premium cement) with mesh and floated it up, surely even with rendaid applied first you still need a scratchcoat then a top coat ?

welcome along Daniel :RpS_thumbsup: if you can get some pics up would be nice. One coat of red building sand is doomed from the start I think. Are you getting this put right?

 

[bodders13]

It won't be the rend aid that's the problem. That crap building sand! You can get plastering sand for a reason, a better blend which will massively reduce risk of cracks.

 

[johniosaif]

the last render job i did was s/c over rend aid the customer wanted it that way

Odd though in my thinking ,expensive also ? Sbr scud would of done the job,,ps how did it go, scratch, leave a week then float?

 

[jamesh271]

Need some advice, having all external rendered with sand and cement , the first two sides completed have hairline cracks all over.
the surface is mainly brickwork and some block work , they applied rendaid first, then applied one coat of sand and cement ( red building sand with premium cement) with mesh and floated it up, surely even with rendaid applied first you still need a scratchcoat then a top coat ?

There is plastering sand for a reason.. Building sand is useless..for rendering genes the cracking..

And only one coat applied... !??

Issues..

 

[jamesh271]

Hense the cracking..*

( stupid predictive text )

 

[jesssop]

Odd though in my thinking ,expensive also ? Sbr scud would of done the job,,ps how did it go, scratch, leave a week then float?

Yeah was expensive 20quid a bag
Left the rend aid 3 days scratched, floated 2 days later.
Deffo use it again

 

[johniosaif]

Yeah was expensive 20quid a bag
Left the rend aid 3 days scratched, floated 2 days later.
Deffo use it again

Twenty a bag ,how much coverage.

 

[jesssop]

It took 7 bags to do 40 meters if I rember right its supposed to do 7 meters a bag

 

[Arti]

i normally get 5m2 if am lucky.....................fu@k knows how they reckon 7

 

[keithuk]

i normally get 5m2 if am lucky.....................fu@k knows how they reckon 7

Same as that mate ,trowel it on ,then run a roller over it to make the stipple

 

[flynnyman]

Need some advice, having all external rendered with sand and cement , the first two sides completed have hairline cracks all over.
the surface is mainly brickwork and some block work , they applied rendaid first, then applied one coat of sand and cement ( red building sand with premium cement) with mesh and floated it up, surely even with rendaid applied first you still need a scratchcoat then a top coat ?

Should of applied a scratch coat

 

[S a plastering]

Surely if rend aid then weber OCR all day long one coat job done building sand FFA defo no no building sand is designed and graded for thin beds ie bricklaying

 

[johniosaif]

Should of applied a scratch coat

They shouldn't of had started at all more like

 

[irish_spread]

Building sand is the problem. It's not properly washed and contains clay/silt :RpS_thumbup:

 

[Wallm0nkey]

I noticed this on a job next door to a house I was working on a new extension the whole side was was sand and cement render and it's cracked all over sounds hollow when tapped. From the colour it appears to be building sand the front was tyroleaned with s/c. Must be the in thing!

 

[Danielasker]

Had to sack him, he tried to argue that what he had done was correct ! He seemed to think that rend aid was a scratch coat and that I could call the rep to confirm this, fortunately they did not have all of the agreed price ( internal plastering and rendering) and there is enough left to get some decent lads to to the work correctly