Old 08-24-2009, 06:44 AM
Join Date: May 2009
Location: Austin, Texas
Posts: 102
Default High Heat Mortar Discovery

Over the course of building my WFO I have found the sand grain size makes a big difference in workability of the mortar. Using the recipe in the oven plans I started with regular sand and found it hard to get good tight joints. I started sifting the sand and have found I can produce a much smoother mortar, less grainy with a longer working time and able to seal thin joints and best of all....it is stickier so I have been able to lay higher chains without a form or tool.
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Old 08-24-2009, 05:48 PM
MK1 MK1 is offline
Join Date: Mar 2009
Location: Nottingham
Posts: 123
Default Re: High Heat Mortar Discovery

I am entirely to your way of thinking. I noticed the heatstop 50 has very fine sand and the homebrew I made did not seat as well like you say. Nice observation.
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Old 08-24-2009, 06:46 PM
Join Date: Aug 2009
Location: Australia
Posts: 10
Default Re: High Heat Mortar Discovery

Using lime mortar is also a better mix for using in a WFO. I havent used clay so I can't comment, but definately using standard portland cement is a no no. It dries quickly and is not a recommended material for use in high temperature conditions. When I went to bricklaying school in Australia, we were told to only use lime mortar for areas in fireplaces and chimneys. That would also apply to WFO's.
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Old 08-27-2009, 06:02 PM
Join Date: Mar 2009
Location: Canada
Posts: 4
Default Re: High Heat Mortar Discovery

I used Silica sand #4 (type used for sand blasting). It is clean, fine and uniform in size and it makes fantastic high heat mortarwhen combined with cement and fireclay. A 50# bag in Saskatoon, SK., Canada is $6.00 and I used 4 bags for my 42" oven
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Old 09-03-2009, 09:23 AM
Lars's Avatar
Join Date: Oct 2008
Location: Omaha
Posts: 255
Default Re: High Heat Mortar Discovery

I agree with Tenne!

The fine white sand at the lumber yard here ( nebraska) is about 4.50/bag and make the best mortar.
This may not be my last wood oven...
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