Fireplace query

Hello, I am preparing a fireplace to receive a gas firebox (Stovax Victorian Tiled insert with Gazco convector). I am building a rectangular brick opening to the dimensions of the box and was going to render the surface to seal any gaps and provide a flat surface to seal against the cast-iron insert. Although not exposed to naked flame the opening should be fire-resistant. Is this true of a concrete render? Will cracks open up with time allowing fumes to escape? Thanks, Ian
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There are products on the market that are packaged similar to silicone sealants. They are specially formulated to resist heat to around 2000F. You can do a search for furnace cement or non-combustible silicate cement on the web. If you have any trouble finding it let us know and we will check with our suppliers.
Cheers
Robert
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