Forno Bravo Forum: The Wood-Fired Oven Community

Forno Bravo Forum: The Wood-Fired Oven Community (
-   Modular Refractory Oven Installation (
-   -   vermiculit (

bing 01-30-2013 03:10 AM

i have agroculture vermiculit 0-5 mm . is it good for floor insulation?

david s 01-30-2013 03:57 AM

Re: vermiculit
Yes that will do fine. Mix it 5 parts vermiculite to one part portland cement and just enough water so that it does not pool in the bottom of your barrow. For every 10 parts vermiculite you need about 3 parts water.Your floor insulation needs to be about 100 mm thick.

bing 01-30-2013 05:07 AM

Re: vermiculit
thanks for answer. goinbg to buy right now. a bag 100 litres is 20 euro.

sclancy 04-01-2013 01:06 PM

Re: vermiculit
I think I know the answer, but the 5:1 ratio is using vermiculite to straight portland cement - no sand added?

My mason is pouring my structural layer this week followed by the vermicrete level a few days later. He has never worked with vermiculite so he is trusting me to feed him the correct info....

david s 04-01-2013 01:15 PM

Re: vermiculit
The 5:1 vermiculite, cement ratio is correct for the under floor insulation slab. It is strong enough. Sand added will increase strength but reduce insulation value.

If you are building an igloo get your builder to mound your structural slab up slightly in the middle to prevent water penetrating under the vermicrete layer. If building a doghouse it doesn't really matter, you can keep it flat.

sclancy 04-01-2013 02:18 PM

Re: vermiculit

thank you for the quick reply!

I will have him omit the sand.

building a doghouse over it so no worries about the vermicrete.....

I found a source for bulk vermiculite quite cheap so no iso or blanket for me....gonna fill the house with 6-10" of vermiculite all around over a modular oven.

Looking to pour the vermicrete base 7" high for extra insulation and more height for my oven floor over the std 4 block high base.

bing 04-05-2013 12:54 AM

Re: vermiculit
is 5 cm (2") ceramic wool enough on the dome? i want to finish dome like igloo. find thing called stucco. can i make stucco with cement, lime and sand, and what ratio? no need to be waterproof becouse the roof over oven.

david s 04-05-2013 01:20 AM

Re: vermiculit
Two inches of blanket should be plenty. A lot of oven builders cover the blanket with a layer of vermiculite and cement because the creases and folds in the blanket leave an irregular surface. This vermicrete layer also adds additional insulation. One or two inches thick should be enough. If you decide to do this then a 10:1 vermiculite, cement ratio is better because it insulates better with less cement. Allow it to dry for at least week before doing the stucco over it.

bing 04-05-2013 02:27 AM

Re: vermiculit
can i make stucco myself. is it mix of sand cement and lime?

david s 04-05-2013 03:39 AM

Re: vermiculit
Yes, I do. The mix I use is 4:1:1 sand, cement, lime. I also add reinforcing fibres to give it more strength.

All times are GMT -7. The time now is 07:43 PM.

Powered by vBulletin® Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0
2006/10 Forno Bravo, LLC