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  #11  
Old 05-16-2013, 03:20 AM
david s's Avatar
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Default Re: Mortar Combat?

If you increase the clay content you increase the amount of shrinkage and hence the propensity to shrinkage cracks.
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  #12  
Old 05-17-2013, 04:36 PM
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Location: Modesto, CA
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Default Re: Mortar Combat?

Thanks - I'm not going to monkey with the proven recipe!
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  #13  
Old 05-20-2013, 08:40 AM
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Location: Modesto, CA
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Default Re: Mortar Combat?

One last mortar question, I hope, regarding sand - what is preferable, fine, medium or coarse? Thanks.
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  #14  
Old 05-20-2013, 09:32 AM
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Default Re: Mortar Combat?

It depends upon the anticipated joint size. For normal masonry (1/4 to 3/8" joints) it is regulated by ASTM C-144. For fireplaces the aggregate is very fine, but for oven that have both large and small joints, masonry sand or play sand or #4 blast sand will all work just fine. Concrete sand/bedding sand/plaster sand will be too coarse.
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  #15  
Old 05-20-2013, 10:01 AM
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Location: Modesto, CA
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Default Re: Mortar Combat?

Somewhere on one of the posts I read #12 silica sand, but then I've also seen reference to fine sand, which I'm guessing is the play sand. I looked at #12 sand at the rockery and it looks pretty course to me. So I'll check check out the masonry, play or #4 blast sand.

Thanks for the quick feedback.
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  #16  
Old 05-20-2013, 10:59 AM
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Default Re: Mortar Combat?

Any supply yard should carry masons sand, which isn't as coarse as concrete or B type sand. You can always sift out larger particles if coarse is the only thing you can find.. Very fine sugar sand, should only be used in very thin mortar joints...1/8" or less.
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Last edited by stonecutter; 05-20-2013 at 11:12 AM.
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  #17  
Old 05-20-2013, 02:41 PM
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Default Re: Mortar Combat?

I'm lucky to have a good supply yard that carries pretty much everything. It's more an issue of my not knowing what is the best bet.

Thanks for the feedback.
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  #18  
Old 05-20-2013, 02:53 PM
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Default Re: Mortar Combat?

Go with the masons sand for your mix since you can get it.
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  #19  
Old 05-20-2013, 03:45 PM
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Default Re: Mortar Combat?

Will do, thanks again!
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  #20  
Old 05-22-2013, 04:50 PM
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Join Date: Oct 2011
Location: Porter, MN
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Default Re: Mortar Combat?

This is my second post here. Question...I'm already done with the support and platform. The herringbone array of bricks is up. I purchased 150 lbs of what is called Hi Cast from Alsey. The ppl at rhe store said it would work for my application. They also sold me some flue set for the inside side of the joints. The hi cast is moldable fire clay from what I understand. This should work for my mortar shouldn't it??
I also sent a photo of the outdoor kitchen as it is so far. oven in the middle.
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