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what do i fill this gap with

Posted: Thu Sep 29, 2011 4:09 pm
by torchy663
Hi

inside the fireplace, there's a gap between the mantle and the chimney of about 2" wide and 30" long

when the previous house owner fitted a mantle and marble back for a gas fire he didn't fill this gap in

B Gas have now told me its unsafe and disconnected he fire as gases can escape behind the mantle and into the living room

question have is what can i fill this gap with, foam, mineral wool, some insulation material, what?

its really awkward to get to, I have to lie on my back with my head in the fireplace so i can look up and do the job

Re: what do i fill this gap with

Posted: Thu Sep 29, 2011 9:43 pm
by welsh brickie
you can either use a fireproof foam,or fill the gap with expanding metal and sand,lime,cement.