Heat stop premixed mortar

[stonecutter]

Re: Heat stop premixed mortar

I looked at some notes I had on my oven in CT.....8:1 on the insulating slab.

[NCMan]

Re: Heat stop premixed mortar

A week or so. Sooner if you leave the form on.

If you notice, I'm a big fan of leaving forms on. I never take them off until they have to come off. The longer they stay on, the better. Thanks.

[NCMan]

Re: Heat stop premixed mortar

I agree. I went with an 8:1 vermicrete 'slab', mostly because it was right in the middle of the ratios (4:1 - 12:1) reported here. After installing the vermicrete under 2" of CF board, I placed some of the last batch surplus into a round butter container and let it dry (3 days).

Even at 8:1, the test 'disk' (6" diameter by 1" thick) was surprisingly rigid and very difficult to compress with my thumb. It had the consistency of one of those puffed rice crackers. I could break an edge off quite easily, but when I placed an 8x8x16 CMU on top of the disk edgewise, it didn't budge.

Thanks. I think I'll be going w/the 8:1 mix, then.

[Scope1]

Re: Heat stop premixed mortar

Just got Heat Stop 50 upstate NY at Herringtons in Hudson NY for $55 a bag, fireclay was $27 for a 50 lb bag. They also have red firebrick at $1.80 each. At that price for HS 50 its hard to justify making your own mix .