Sand and cement on cement board, for ICF house

[Stevief111]

Hi folks,
Im currently building an ICF house, im familiar with acrylic and Monocouche render finish but id preder a sand and cement finish.
I was considering fixing a 12-14mm cement board onto the outside wall, then apply a few coats of tistle bond or rendagrip to it , then scud coat scratch coat and sand and cement finish.
What do ye reckon?
Bare in mind ive sand and cement finish plastered a smooth formed concrete wall 5 years ago and i only applied thislte bond, and then scud scratch and finish and no problems.

 

[bobski]

Last 6 months at a push.

 

[bobski]

Just saw this, next thread down.

D

Thread 'External rendering over cement board. PLEASE HELP'

May 30, 2017

Hi guys. I'm new to the forum so hello .

We have recently put a new timber extension to the side of our house.

We have used cement render boards to try and make it as lightweight as possible (white ones like aqua panels 12mm thick)

My plasterer is a bit old school and he sbr'd the surface of the board and put a base/ scratch coat of cement on and then a top coat.

Needless to say it has all fallen off as the base coat hasn't adhered to the cement board.

We are now not sure what to use to render the boards and reluctant until we get some advice.....

Any ideas please??

• Dimmy
• Replies: 42
• Forum: General Rendering Discussions

• 

 

[Stevief111]

Last 6 months at a push.

Why is that?

 

[Stevief111]

Saw that thread earlier, plasterer looked like a rooter and he didn’t use any bond

 

[FreeD]

Seriously we are f**ked if this is the thought process on construction jobs in the country.

 

[Stevief111]

Seriously we are f**ked if this is the thought process on construction jobs in the country.

 

[Stevief111]

Right so Fred, What do you suggest is the most durable for ICF so

Seriously we are f**ked if this is the thought process on construction jobs in the country.

 

[bobski]

Why is that?

To avoid getting technical, simply put - too heavy and no flexibility



You stated you're familiar with acrylic, what systems do you know or have you used?

 

[Stevief111]

I’ve used both acrylic and monocouche, the first time with monocouche there came hairline cracks, had no problems with the acrylic, just not that durable, I can live with it but just thinking if there is a more durable render for it I’d love to know

 

[malc]

I’ve used both acrylic and monocouche, the first time with monocouche there came hairline cracks, had no problems with the acrylic, just not that durable, I can live with it but just thinking if there is a more durable render for it I’d love to know

For cement board you need an operative with experience of polymer thin coat systems, No SBR, no Sand and Cement.

 

[FreeD]

Right so Fred, What do you suggest is the most durable for ICF so

Have you ever used Google before? Polymer modified base coat fully meshed. Get a spec and follow it simple.

 

[bobski]

I’ve used both acrylic and monocouche, the first time with monocouche there came hairline cracks, had no problems with the acrylic, just not that durable, I can live with it but just thinking if there is a more durable render for it I’d love to know

Meeting halfway, can you not get the base coat you used?

And finish to the same texture?