Chimney sealling through cement board

[sjdritz]

Hi,

I would like some ideas on how to seal the chimney that is going through the cement board. I am still figuring out how to do the roof, but I think I am leaning towards mosaic tile. I would need a way to seal it so that it retains a "flat" look, like it does in the picture so that I could tile over it.

Thanks,

Scott D.

[david s]

Re: Chimney sealling through cement board

Try a high temp. silicon