Vermiculite vs perlite for insulation under the oven floor

[Derkp]

I have learned from other posts to give it a good time to set up. I have a bathroom and a roof to replace so mine will probably set for a good week or so. It gets better and better as time passes, so be patient.

Derk

[Tscarborough]

If you can wait it certainly won't hurt to do so, but if you are impatient you can do it it the next day like I did. I did wet set the floor in mortar though.

[david s]

It is important to get the water content right. There is a tendency to add too much which results in an uneven mix. It needs approximately double the quantity of water that normal concrete requires. I've found that for every 10 parts of vermiculite by volume you need 3 parts water.

[Derkp]

Tom,

What was your recipe for your floor setting mud? I have fireclay and #40 mesh sand to use.