The point of using firebricks is to soak up and hold the heat from the fire. Our Firebricks are 38-42 Grade and can withstand temperatures up to 1400 degrees Celsius. Now the Vermiculite mix, but first here is a tip for gardeners. I should point out that I was using firebricks for the base, walls and dome. 4. Entrance & Chimney No need to worry thou, with good quality insulation material 3” was sufficient. The idea being  to pour concrete into the frame to create a simple retaining wall for the vermiculite. You also need to think about what you are going to use the oven for, just pizza’s or for cooking a Sunday roast? I should say that when I brought my original fire bricks from Vitcas, they were perfectly straight with good right angles. The set for this oven were not so good, which meant I had a lot of gaps in my herringbone oven floor. Continuing on my theme of simple and cheap I was originally going to use paving slabs. 10. To get around the problem I put a piece of strong insulation foil I had lying around the garage on top of the sleepers. Then a good layer of insulation on top to keep the heat  in. Next, I put the bricks back in the frame and slowly tapped them into the sand, making sure I had a completely flat surface. For a pizza oven, firebrick directly on the structural slab is *the* formula for insufficient floor heat and/or excessive fuel consumption. I was able to do all my cutting with a small angle grinder with a 116mm disk. Now came the fun part of cutting the bricks and for this I used an angle grinder with a diamond cutting wheel. =======================  STOP PRESS UPDATE   ===========================, That last statement is complete and utter rubbish! Oven Floor 9. I hear you say, “It is made of wood and will burn”. Lay dry plaster sand inside the oven; spread it around and smooth off to be level with the doorway screed. This is because you build on top and around the base. To decide the floor size, I simply laid a series of bricks where I saw the wall would be and then drew in pencil on the fireboard. Once all the bricks were cut, I set the floor on a bed of one part fire cement and one part sand mix. When you drop a pizza on the hot base and see it instantly expand, and cook in front of your eyes it is really cool. This also has the added advantage of bonding the base sleepers together. Next I set several Calcium Silicate boards on top of the vermiculite to create another fireproof insulation level.  (adsbygoogle=window.adsbygoogle||[]).push({google_ad_client:"ca-pub-6149296995586787",enable_page_level_ads:true}); So let’s start with the material for the oven floor. If you think about it, the size of the oven floor ultimately defines the size of the whole oven. Most pizza oven build guides talk of making a wooden frame, pouring in the mix, and letting it set hard. Unfortunately I didn’t have much left so I used good quality kitchen foil (but don’t tell the wife!). This now brings us to the size of the oven floor. Now a word of warning, as all gardeners know vermiculite holds water, so a think insulated base of 6” takes a long time to dry. There are lots of references on the Internet to the correct size for the oven floor and all are different. You don't have to use vermicrete, but please put some form of high-temperature insulation (cal-sil, foamglas, Insblok 19) under the floor. I ignored all this information and went with what worked best for me. Next I was concerned that the sand would pierce the insulation material and the sand would still drop through into the cracks so I then put down some pressure treated wood on top, this time going in a perpendicular direction to the direction the sleepers were laid. This time I was going to use insulated fireboard under the bricks, the thickest I could find. This is where is didn’t work for me. This now brings us to the size of the oven floor. I was always going to have to cut bricks for the walls and roof, so it made sense to cut the base as well. Also how much heat would I loose through the base. Living with the Oven Click to see them in more detail. Just make sure your wife hasn’t put the washing out or you will be in the Dog House. I was convinced over time the sand would fall through the cracks in the sleepers. I then added water to make a sticky porridge mix and then added inside the frame. As I say “there is nothing wrong with making a mistake when doing something new, as long as you learn from that mistake”. Design Well I completely underestimated how hot these ovens get, two of the sleepers got so hot they started to smoulder. We can also supply these Fireclay bricks cut to specific drawings. Now came the simple bit, I just bedded it on top of a mortar mix, making sure I kept everything level of course. 8. I look back at my old oven and wonder how I ever managed to cook in such a small space. 3. Screed the doorway floor with screed or plaster mix of about 10 mm thick. The brand of brick I went with for the oven floor were Vitcas Fire Bricks. Apparently it is all to do with steam and moisture being drawn out of the dough, just look at all the pizza stones you can now buy. First you need to decide are you going to build the side wall on top of the oven floor or around it. Also how much do you want to cook at a time, for instance do you want room to cook several pizza’s? Insulation If you think about it, the size of the oven floor ultimately defines the size of the whole oven. The last thing I did was brush fine sand in-between the bricks to lock and hold them in place. Once the oven is at the correct temperature it only takes a couple of minutes to cook a pizza so I decided on a base size of Y x Z. I built the oven floor by first laying the bricks on the base I had previously built. That is the end of this section, in the next I deal with building the walls and dome. Once I had the shape of the oven floor drawn, I laid my fire bricks on top of this in a herringbone pattern. 1. The only problem with the second option, is you need to cut the bricks on the oven floorso they fit snug inside the walls. Best Clothes, How do you cut Flower pots when building a Tandoor, Making Tarte Flambee or Flammkuche for a family party, Getting ready for my next Pizza Oven Build in the shape of a dragon, Using Sand for Insulation in the Tandoor - SimpleNick.

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