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-   -   Oven Dome Mortar Mix? (http://www.fornobravo.com/forum/f6/oven-dome-mortar-mix-13656.html)

EricU 07-29-2010 04:28 PM

Oven Dome Mortar Mix?
 
4 Attachment(s)
I will be starting my 42" diameter WFO dome (I have a lot of pics posted in the thread My Build ) and I need some clarification on the mortar mix to use for the fire bricks that make up the dome.

Is the following mix the one to use?

1 part portland
3 parts sand
1 part lime
1 part fire clay


And for the sand, can I use the standard plaster sand that I normally use for masonary work?



Thank you, Eric.

EricU 07-29-2010 11:42 PM

Re: Oven Dome Mortar Mix?
 
Or should I use "Heat Stop"?

I could not find the link to the FB product? and wouldnt the shipping on a 50# bag kill?

Thanks again, Eric.

nissanneill 07-30-2010 02:57 AM

Re: Oven Dome Mortar Mix?
 
Hi Eric,
I would use (as I did on my 40" Pompeii build) brickie sand rather than plastering/rendering sand. I believe this is a little more 'fatty' than plaster and.
I personally would not use the refractory cement as I have not been impressed by the many postings in this forum reporting considerable cracking when using it when (please correct me if I'm mistaken folks), but I haven't seen one report of cracks when using the 'poor man's mortar mix.

Cheers.

Neill

dmun 07-30-2010 03:33 AM

Re: Oven Dome Mortar Mix?
 
As to the question of sand, it's reported that really fine sand makes a difference when mortaring our narrow joints.

EricU 07-30-2010 08:42 AM

Re: Oven Dome Mortar Mix?
 
So where does one get the finer sand? When I do masonary work, I just go to the yard and ask for "plaster sand"?

Thanks for the help, I really dont think I would have done this project without this forum and your guys help.

Eric.

dmun 07-30-2010 10:41 AM

Re: Oven Dome Mortar Mix?
 
It's sometimes called "silica sand" and it's sold in various meshes for abrasive finishing, or sandblasting.

EricU 07-30-2010 05:32 PM

Re: Oven Dome Mortar Mix?
 
Quote:

Originally Posted by dmun (Post 95679)
It's sometimes called "silica sand" and it's sold in various meshes for abrasive finishing, or sandblasting.

But Where do I get this finer sand?

Thanks, Eric.

fxpose 07-30-2010 05:59 PM

Re: Oven Dome Mortar Mix?
 
Quote:

Originally Posted by EricU (Post 95700)
But Where do I get this finer sand?

I picked up a 100lb bag of silica sand at Home Depot.

George

Tscarborough 07-30-2010 06:12 PM

Re: Oven Dome Mortar Mix?
 
Plaster sand, AKA Torpedo sand, AKA concrete sand, AKA setting sand has too big of aggregate allowed (up to 1/4"). Since the goal is 1/16th joints (but the reality is <3/8"), any fine sand will work. Masonry sand, play sand, sugar sand, finer grade blasting sands, but NOT All Purpose sand.

EricU 07-30-2010 06:14 PM

Re: Oven Dome Mortar Mix?
 
Quote:

Originally Posted by fxpose (Post 95701)
I picked up a 100lb bag of silica sand at Home Depot.

George

Home Depot I have heard of! As a matter of fact I have my own parking spot and they all yell "ERIC" when I walk in!


Thanks for the lead, Eric.


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