Pouring the hearth Newbie Forum Discuss Pouring the hearth in the Good Background Information forums; When you are pouring the two layers in the hearth, can they be poured several days apart or do they ...

[C5dad]

When you are pouring the two layers in the hearth, can they be poured several days apart or do they need to be done wet on wet??

Thanks,

Chris

[dmun]

As the insulating concrete only has compressive strength, it doesn't matter when you apply it. Do it as your schedule permits.

[C5dad]

LOL

I poured separately. I was more concerned about shearing due to heat than anything else. It all worked out well as I had to do the vermicucrete in 2 pours.

[Neil2]

Exactly as Dmun says. They can be separate pours. In addition, the insulated vermicrete layer does not have the same footprint as the structural slab (typically much smaller) , necessitating a certain amount of form work after the structural slab pour sets a bit, usually at least the next day.