Falster farm mud oven project
In building this prototype mud oven I have basically been following the excellent instructions by Kiko Denzer in his “Build your own earth oven” book.
The oven is built on wheels, to enable the farm to show it in burning action at different markets.
I will here give you a resumé of the building process.
Step 1: Making a concrete slab and running two iron bars through it, this to enable future movement of the oven on and off the trailer. The slab was poured onto a round piece of plywood with a 5″ tall ring of wood, securing the slab. Chicken wire was added as reinforcement.
Step 2: Building a stonewall base
The stones are layed with a lime mortar consisting of ¼ lime and ¾ playsand. The reason for not using concrete is that it doesn’t breathe. The lime/sand mortar becomes rock hard but allows the moisture to travel in and out of the oven, releasing the construction of stress.
Step 3: Insulating the core of the base.
Clay was mixed with sand and sawdust producing a mushy and after drying, light and air-holding insulation material.
Step 4: Brick baking floor and opening arch
Step 5: Making playsand “casting dome” that the clay layers will be resting against until completed when the sand is removed, creating the oven cavity.
Step 6: Laying the first dense clay layer that will exposed to the actual fire. This process had to be redone with cleaner clay, creating the right texture. The clay was mixed with sand and water and worked in a mixer.
Who said clay wasn’t fun!?
Step 7: Oven insulation
Step 8: Top plaster
Step 9: Fire in the hole!
The oven is being dried slowly with multiple small fires, this to minimize the amount and size of cracks.
A door is yet to be made!