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10-14 bags of builder’s sand (20kg each)

125-175kg clay (the cheapest will do – try angliaclaysupplies.co.uk)

The amount of clay needed depends on the size oven you are building. So total clay needed is about 25 gallons for a 22-1/2" oven, about 35 gallons for a 27" oven, and about 50 gallons for a 36" oven.

Sand: HOW MUCH? Plan on about 300 to 500 lbs of sand if you are using clay soil with at least 50% sand content; if you are using bagged pottery clay, double the sand.

Clay suppliers

Vitcas