Vermiculte Getting Started Discuss Vermiculte in the Pizza Oven Design and Installation forums; Hi all I am ordering the vermiculite for the insulation today and have been informed it comes in three grades. ...

[spt]

Hi all

I am ordering the vermiculite for the insulation today and have been informed it comes in three grades. Fine 1 mm, medium 3-4 mm and coarse 8 mm. Which grade is best to use? Will the 8 mm be too coarse and not set well with the cement? Could both medium and coarse be used? Any suggestions would be greatly appreciated.


Regards

Dave

[Les]

Dave,

Two bags that I bought were the 3-4 mm. I needed one more and bought the same bag at a different store and it was 1mm. The 1mm is like sawdust, I would avoid that. I think the 3-4 is your best bet.

Les...

[Breven]

I agree with Les, always do. Medium seems to work best for everyone. Coarse might not hurt, but avoid the fine grain.

[RTflorida]

Agreed.....no fine stuff, 1/2 of it will blow away when mixing. It also will be less efficient, creating smaller air pockets in the insulating layer.

RT

[ThisOldGarageNJ]

I used the medium as well and my oven holds heat VERY well

Cheers

Mark

[spt]

Thanks for the replies. I've decided to go for the medium coarse.

Regards

Dave