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Post by norfolkpizza on Jul 13, 2022 23:07:38 GMT
Hi,
I'm currently building a bit of an outdoor kitchen area and trying to decide how to insulate under the fire bricks of the floor.
I have heard people using thermalite blocks instead of the more usually perlite/vermiculite & cement mix - how do the two compare thermally for the same thickness? I like the idea of thermalite blocks for ease and no waiting for the perlite mix to dry out.
Any input would be appreciated
Thanks,
Joe
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Post by downunderdave on Jul 18, 2022 3:37:21 GMT
Hi, I'm currently building a bit of an outdoor kitchen area and trying to decide how to insulate under the fire bricks of the floor. I have heard people using thermalite blocks instead of the more usually perlite/vermiculite & cement mix - how do the two compare thermally for the same thickness? I like the idea of thermalite blocks for ease and no waiting for the perlite mix to dry out. Any input would be appreciated Thanks, Joe Hi Joe, yes it could be a good plan, but check the density of the thermalise blocks first, then refer to the table on vermicrete. Treat vermiculite and perlite as the same. While perlite is a slightly better insulator dry, as soon as you add cement the resulting mix is the same. Generally the denser the material the poorer the insulator. Builders have found a 5:1 vermicrete strong enough to support the weight of the floor and oven, but for over the dome insulation which is not load bearing, you can go down to 10:1. Any leaner and it's not very workable and difficult to apply.
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