The right mix?


Postby hevjam1 » Mon Aug 11, 2008 3:04 pm

Hi, can anyone tell me what additive I need to add to my mortar mix for cementing around a coal fire? I've been told to add vermiculite but this doesn't seem right.
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Postby welsh brickie » Tue Aug 12, 2008 7:31 am

Are you fitting a fire back?
If so yes vermiculite is ideal,or you could use sand&lime the reason for these are that if you used cement in your mix it will expand under heat and crack the fire back.
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Postby hevjam1 » Tue Aug 12, 2008 10:23 am

Thanks for your reply, I probably will fit a fire back but at the mo I'm just repointing etc. Do you mean the same vermiculite that I would use in the greenhouse for sewing fine seeds. Small flakes?
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Postby welsh brickie » Wed Aug 13, 2008 2:59 pm

If you go to your local builders merchant they will supply you with the right stuff.
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