High-Temperature Mortar – Low-Cost 4 Material Blend
High-Temp Mortar is basically the glue that holds all the brick and block together on all wood-fired ovens (and fireplaces). This simple and inexpensive high-temperature mortar recipe is used the world over. From Australia to Zimbabwe… we all make it the same way.
In a clean wheelbarrow or mixing tub, thoroughly dry-mix the (4) materials listed below in a 3:1:1:1 ratio.
- 3 Parts Silica Sand
- 1 Part Hydrated Lime
- 1 Part Fireclay
- 1 Part Portland Cement
Silica Sand –
Silicon is the 2nd most abundant element in the earth’s crust – so it should be easy to find bags of Silica Sand near you - right? Well, not so much. Pure Silica Sand (which is almost like powder) can be elusive. Some Landscape supply stores carry this item – some don’t. But almost EVERY Pool Supply store does (it’s pool filter sand) Google Maps
ONLY USE THESE TYPES OF SAND
Pool Filter Sand
Fine Silica Sand (All mesh sizes)
(The Finer the Grain the Better)
DO NOT USE -
Sand / Topping
Fire Clay / Mortar Clay / Bricklayers Clay -
Pure Fire Clay, Mortar Clay and/or Bricklayers Clay is an organic material that has been dried and turned into a powder form. It is usually a brackish red / brown in color or it could be white / grey. The texture is like baking flour or baking soda.
These powdered clays can be found at most Masonry and Landscape Supply Stores for about $10 - $15 a bag. You may find a bag at a Big Box store, but it’s unlikely. And you will never find fire clay at a Refractory Materials dealer.
If you can’t find a bag near you, be sure to check with your local Ceramic Supply Google Maps and they can order a bag of Fire clay for you.
If all else fails - we can always ship you a bag of Fire Clay.
Hydrated Lime / Powdered Lime / Construction Lime -
This is the product that confuses some of our customers. It is NOT granulated Lime that is sold in the plant section at Home Depot or Lowes but a white and fluffy material that looks and feels like powdered sugar. It is used in the masonry and landscape industry – but it also used in the Plant Nursery industry in 50lb bags.
If you are unable to find this product at your Landscape Supply, call a local Plant Nursery and they can order lime for you - Google Maps
Portland Cement -
Portland Cement is sold at EVERY Big Box and most Mom & Pop hardware and lumber stores. It’s a staple in the construction industry… and it’s cheap! Just make sure you buy pure Portland Cement – NOT PORTLAND CEMENT WITH LIME PRE-MIXED INTO IT. That will throw-off the mixture of the high-temp blend.
PLEASE NOTE - THIS IS A SCRATCH RECIPE FOR HIGH-TEMPERATURE MORTAR. NO MATTER WHAT YOU READ ONLINE OR WATCH ON YOUTUBE, THIS BLEND CAN NOT, AGAIN, CAN NOT BE USED AS A HOMEMADE CASTABLE REFRACTORY. THIS RECIPE IS TO BE USED AS A MORTAR ONLY.
Be sure to Download & Print this High-Temperature Mortar Recipe!
BrickWood Ovens Installation Instructions