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Derkp 04-13-2010 01:34 PM

Fire Brick Size?

We have quite a few fire brick that are 2.5-7"X5X18 long, also our design is almost all exact dry fit.

How much mortar is required if the bricks fit tight?

Anything that I should know about using such large bricks in the hearth and back wall?


Raffy 04-13-2010 05:53 PM

Re: Fire Brick Size?
Using large brick is actually good for the hearth. The less seams the better for cooking since the the hearth/floor is the surface where the food will be cooked. If your brick is 5 inches thick then you'll have more thermal mass than most other oven's built with the FB Pompeii Plans. Standard firebrick is around 4 inches thick you see but I don't see any problems with that. Worst consequence is that it will take you a few minutes longer to heat up the floor.

Derkp 04-13-2010 06:17 PM

Re: Fire Brick Size?
Thanks for the help.

I remeasured my brick and it is 4 1/2 inches thick. It is also new firebrick from a scrapped steel factory, they had many, many, many thousands of different sizes. The company selling it said it was good for 3000 degrees F. We are planning on a 27X41 oven floor with a 14 inch arch height. We are designing a barrel oven. Does anything sound funny with those numbers?

Thanks for your advice.


Tscarborough 04-13-2010 07:01 PM

Re: Fire Brick Size?
With a 14" arch height, your opening will need to be around 8.75 to 9 inches tall. That seems pretty low. My barrel vault is 22"Wx36L" long, with an dome height of 22" and an opening of a tad over 13".

Derkp 04-14-2010 09:23 AM

Re: Fire Brick Size?
I am still in the dry fit, see what size I really want stage.

Thanks for the help.

Are there any other critical measurements that I need to be aware of before I start mixing cement?

I could just add a brick or two to the arch and opening and I could come close to your measurements. Does it draw ok?
I have ordered all of the most popular and recommended books through interlibrary loan to get all the knowledge I can before I start.

I will try to post a few photos this evening of what I have to work with.

Thanks again,


Tscarborough 04-14-2010 09:46 AM

Re: Fire Brick Size?
One match fire start and not a whiff of smoke out the front.

Derkp 04-14-2010 09:53 AM

Re: Fire Brick Size?
Is the bottom of the flue pipe at the inside height of the dome or the opening?

Tscarborough 04-14-2010 10:21 AM

Re: Fire Brick Size?

Derkp 04-14-2010 02:43 PM

Re: Fire Brick Size?
Thanks !

That is the picture I have been looking for!

Did you use regular mortar to full in the space or Refractory?

Tscarborough 04-14-2010 07:40 PM

Re: Fire Brick Size?
Home brew refractory. Link in sig has all the pics.

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