Boarding a fireplace

[tomo13]

Hi All. I have a fireplace to tile in splitface mosaic. The fire is going to be inset. At the moment it is brick and blocked. Customer was going to get it rendered. I was thinking of sticking Marmox and fixing with spankers. thought it might handle the heat better. Any ideas on the best way forward. thanks for any replies. Steve

 

[White Room]

I would have said the render would be better for the heat than the Marmox which has foam sandwiched between the cement layers.

 

[tomo13]

Forgot to say the tiles will only be on the front of the fireplace upto the ceiling, as the fire is inset with a frame around it. not actually an open fire style.