It’s focused on safety and durability, and some materials to avoid. Here’s a quick read (which you may already have seen) from Bob Vila’s web site. I thought better safe than sorry, if there is a risk the concrete might be damaged from the exposure to the heat. Of course you’ll need to round up to the closest bag size they sell, but this should also account for any differences in volume among the different materials. Silica Sand: 3 X 66.67 = 200 poundsįireclay, Lime, and Portland Cement: 1 X 66.67 = 66.67 pounds of each ingredient So the approximate quantities of dry ingredients I need are: (Which requires only one multiple, for the sand, because every other ingredient is just one part!)įor my build, the Mattone Barile Grande, the instructions specfiy about 400 pounds of dry pre-mix. Then, multiply the result by the number of parts needed for each ingredient. Take the total quantity of dry premix specified for your build and divide it by 6 (which is the total number of parts you need in the mix ratio). If you are planning to use the 4-material blend, and are thinking “How much of each of these materials do I need?” (like I was), here’s a cheat sheet to figure it out: Your oven’s installation instructions will tell you how much premixed dry high-temp mortar you need. That’s versus flour, which compresses or expands depending on how much air you mix into it. (Though my mind also goes to the object of this exercise and I do my pizza dough by weight.) Unlike flour, these are all fairly stable materials that will settle out the same way no matter how many times you scoop up a measure. THIS RECIPE IS TO BE USED AS A MORTAR ONLY.īe sure to Download & Print this High-Temperature Mortar Recipe!īrickWood Ovens Installation Instructionsīy volume. NO MATTER WHAT YOU READ ONLINE OR WATCH ON YOUTUBE, THIS BLEND CAN NOT, AGAIN, CAN NOT BE USED AS A HOMEMADE CASTABLE REFRACTORY. PLEASE NOTE - THIS IS A SCRATCH RECIPE FOR HIGH-TEMPERATURE MORTAR. That will throw-off the mixture of the high-temp blend. 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. Portland Cement is sold at EVERY Big Box and most Mom & Pop hardware and lumber stores. 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 It is used in the masonry and landscape industry – but it also used in the Plant Nursery industry in 50lb bags. 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. This is the product that confuses some of our customers. Hydrated Lime / Powdered Lime / Construction Lime. If all else fails - we can always ship you a bag of Fire Clay. 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. And you will never find fire clay at a Refractory Materials dealer. You may find a bag at a Big Box store, but it’s unlikely. These powdered clays can be found at most Masonry and Landscape Supply Stores for about $10 - $15 a bag. The texture is like baking flour or baking soda. It is usually a brackish red / brown in color or it could be white / grey. Pure Fire Clay, Mortar Clay and/or Bricklayers Clay is an organic material that has been dried and turned into a powder form. But almost EVERY Pool Supply store does (it’s pool filter sand) Google Mapsįire Clay / Mortar Clay / Bricklayers Clay. Some Landscape supply stores carry this item – some don’t. Pure Silica Sand (which is almost like powder) can be elusive. 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. In a clean wheelbarrow or mixing tub, thoroughly dry-mix the (4) materials listed below in a 3:1:1:1 ratio. From Australia to Zimbabwe… we all make it the same way. This simple and inexpensive high-temperature mortar recipe is used the world over. High-Temp Mortar is basically the glue that holds all the brick and block together on all wood-fired ovens (and fireplaces). High-Temperature Mortar – Low-Cost 4 Material Blend
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