Recommendations for a weatherproof (cement) cladding board

[markharro]

I fitted STS constructions boards as a substrate for our renderer and am familiar with them. The are not suitable to be used externally without a finish.

 

I now need to source something similar to clad the EPS plinth of the house. The plan is to find a board that can be stuck on and left without the need for any finish be that render or paint etc. Can anyone recommend a suitable product? thanks

[Russell griffiths]

I can recommend James hardie boards, however you will struggle to stick anything onto the eps. 

Unless you have found some miraculous sticky thing, 

I rendered my plinth with a waterproof render finished with a marble/ silicon top coat. 

Finished in a dark grey so it looks like a traditional renderered plinth. 

[saveasteading]

21 minutes ago, Russell griffiths said:

you will struggle to stick anything onto the eps. 

I'm rather amazed that the manufacturers haven't found a standard solution for this, as it is a common question, and would concern me.

If there was one, they would supply it or even apply it at the factory.

I'd be concerned about any (even a few mm) eps being exposed to air or earth too, as rodents and insects could burrow a cosy home.

Perhaps  find a screw/ rivet type fixing that can expand deep in the eps to form a grip?

 

[nod]

If you apply a 5 mil coat of silicone base coat 

You can stick cement board directly to it with a flexi tile adhesive 

[Russell griffiths]

1 hour ago, nod said:

If you apply a 5 mil coat of silicone base coat 

You can stick cement board directly to it with a flexi tile adhesive 

I have done exactly this. 

But ive found a problem with expansion/ contraction, if I used a length of cement board longer than 2m they crack as the weather changes. 

[Onoff]

Didn't @Jeremy Harris stick black upvc fascia on with Soudal Low Expansion foam?

[markharro]

Thanks everyone - here is the adhesive I am planning to use - you will see in the small print at the back that it explicitly says that you can use it with polystyrene!

 

In the comment about the Hardie boards - do you mean the backer boards that are normally used internally as tile backer boards?

[Russell griffiths]

9 minutes ago, markharro said:

Thanks everyone - here is the adhesive I am planning to use - you will see in the small print at the back that it explicitly says that you can use it with polystyrene!

 

In the comment about the Hardie boards - do you mean the backer boards that are normally used internally as tile backer boards?

I suggest you do some testing. 

It sticks eps to eps but try sticking the cement board to the eps, been there tried that. 

The only method I found has been mentioned, a coat of render then tile adhesive, or just render it. 

James hardie make a board for exterior use it comes in various sizes and colours. 

[Onoff]

I've successfully stuck eps to brick and concrete with Soudal Low Expansion Foam. 

[Chanmenie]

On 28/01/2024 at 11:09, Russell griffiths said:

I can recommend James hardie boards, however you will struggle to stick anything onto the eps. 

Unless you have found some miraculous sticky thing, 

I rendered my plinth with a waterproof render finished with a marble/ silicon top coat. 

Finished in a dark grey so it looks like a traditional renderered plinth. 

James hardie say you must have an air gap behind the boards, so sticking them might not be an option anyway

[Onoff]

5 minutes ago, Chanmenie said:

James hardie say you must have an air gap behind the boards, so sticking them might not be an option 

 

Packers?

[Chanmenie]

For Hardie cladding boards they state minimum 20mm air gap 

[Nick Laslett]

My original plan was to affix cement board to finish my EPS foundation plinth. But the guys doing the rest of the ICF rendering, recommended this solution, Mosaic render from EWIPro. 
 

https://ewistore.co.uk/shop/external-wall-insulation/mosaic-render-ewi-050-25kg/

 

 

[Russell griffiths]

snap, used the mosaic render from the ewi store.