Old 09-25-2008, 04:23 PM
Join Date: May 2008
Location: Howden, Tasmania, Australia
Posts: 62
Default Grade of vermiculite to use for render?

Hi. I originally purchased all my WFO supplies a few weeks ago, bricks, insulation, mortar, vermiculite etc. After much thought (and many questions on this forum) I decided to lay vermiculite concrete under my calsium silicate board so I purchased some extra vermiculite from the local hydroponic supplier.

The vermiculite I purchased off him was grade 4 and the size of tiny marbles, the product I purchased a few weeks ago was grade 2 and much finer in size. I mixed the two together to make the concrete and it seems to have worked well.

My question is what grade (or partical size) should I use for the insulation around the dome once it is complete?


Last edited by pizzahead; 09-25-2008 at 09:43 PM. Reason: typo
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Old 09-25-2008, 06:57 PM
Join Date: Jun 2008
Location: Melbourne Australia
Posts: 399
Default Re: Grade of vermiculite to use for render?

Grade 2 or 3 are the better grades Jase.
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