Mortar, refractory heat resistant, and wood fired ovens.

Pizza ovens building and plans for construction.  
Advertising | Contact Form & Profile | Blog
Please link to wood burning oven tutorials here on
Is this website useful? Please,
Link to us

Refractory mortar and wood fired ovens.

For high quality oven, refractory mortar should be used in only up to ¼" (6mm) thick application. Mortar only assists in forming firing chamber and shouldn't be used or exposed on the inside hot-face. Refractory mortar should not be used to plug holes or big spaces between firebricks. Clay body of refractory firebricks face the heat. Thicker mortar applied always shrinks (* more information further down). Shrinkage would create space and increased brick movement / gap between cold state and state expanded by heat.

Every time this gap happens bricks change position, just a little bit but enough to cause rebuilding job in the future.

Before work with bricks and mortar, dip firebricks in water.
Before work with firebricks and mortar
dip bricks in water.

* Firing linear mortar shrinkage of up to 8%

Refractory mortar formulas

10 : 3 : 1.5 - Sand, Calcium Aluminate cement, Fireclay.

If you found hard locating refractory cement don't worry, here is one mixing formula with Portland cement plus lime available in ordinary building stores.

There are two Portland cement types, get the common gray in color, the other one is white decorative used for around pools etc. where a white effects are required.

Lime is calcium it takes over the cement in hot conditions (Portland will gradually burn out, it is used only for the mortar to set while working.)

10 : 6 : 2 : 3 – Sand, Fire Clay, Portland cement, and Lime.

This is how to mix the refractory heat resistant mortars.
Mixing heat resistant mortar.

Mix first all dry ingredients well, then in small amounts start adding clean water at room temperature while continuing mixing.

Mix into peanut butter consistency. Thin application between firebricks and only where needed e.g. in "V" sections between arched bricks on outside. Inside the arch - these bricks should be in line next to each other touching without gaps. No need for mortar between floor and wall bricks, in barrel shape dome you will not use too much mortar in arch too - it's very easy. But if you do a round dome make sure you don’t get spaces in between bricks exposing mortar on inside the dome and big thickness of mortar on outside - start to angle cut bricks as soon as gaps begin to occur.

In any case, on the inside of a dome there should not be any gaps. Only a small amount of mortar should always be used for it to stay strong. When buying firebricks ask your refractory supplier about that too. (Fire clay explained.)

Learn more related about:

Translate language of this web page with Google Website Translator tool:

Temperature gauge in oven
Jamie and Katrina's brick oven with temperature gauge, in Victoria.

Cooking in fireplace is also an art.
My oven with fireplace, cook food and heat water, by Joel in Philippines

Baking sourdough breads in quantity.
Baking sourdough breads in quantity in Canada

Wood oven with meat cold smoker.
Wood oven and meats cold smoker by Reinhard in Clearwater, Florida

Home Page
Oven building CDrom details

Pizza ovens
New gallery
Oven meals
Vintage forum
Rectangle shape vs. round igloo
Building details
Refractory concrete
Heat resistant mortar
Concrete cladding layer
Thermal insulation
money & time

Good thermometer
Oven building 1
Building oven 2
3G MTo
Building oven 4
Oven tutorials
Pizza A to Z
When is oven hot?
Pizza dough
Oven cooking
Roasting coffee
Firing oven
Work & safety
Food additives
Healthy Papaya
L-lysine & food
Unit measures conversion

U.S.A. deals
AUSSIE deals
U.K. deals

Contact form
& My Profile

My wish list
Consulting help
Site map

Image of a brick wood burning pizza oven.

To link to this site from your website, only cut and paste the following code into your webpage.
It will appear on your page as: Wood-fired brick pizza, bread, roast oven tutorials.

I've done my best to build this site for you- Please send feedback to let me know how you enjoyed visiting.

Refractory heat resistant mortar recipes for building wood fired firebrick ovens. | Privacy policy