portland cement to vermiculite Heat Management Discuss portland cement to vermiculite in the Oven Management forums; whats the mix ration porland cement to vermiculite for the below floor isalation layer....

[istoven]

whats the mix ration porland cement to vermiculite for the below floor isalation layer.

[dmun]

complete instructions:

Pompeii Oven | Brick Oven Hearth

[Wiley]

Some have used ratios as rich as 5 to 1 and many of us have used 9-10 to 1. I used 9+ to 1 using the slurry method (cvduke's method) and had no problems using that lean a mix. Do a search with "cvduke" in the search box and you should get his thread on the method.

The leaner the mix the better the insulation value for a given thickness.

Hope that helps,
Wiley