So the first layer thermal mass of cob mixture consists only of clay sand and water.
Cob oven roof.
Cob ovens use clay mixed with sand for the thermal mass and clay mixed with sand and a large amount of straw as an insulating layer on the outside.
We have access to good lime sand renders for sealing is this sufficient to avoid moldy walls.
A cob pizza oven dome is a basic structure built out of a combination of mud sand water and straw.
Posted 7 years ago.
Factor in another 8 for the cob dome itself 4 thickness around the entire sand form 16 for insulation 3 for plaster and another 4 for the diameter you may lose as your foundation grows taller and tapers inward.
Fall and spring tend to be wet periods we ll get a week or two of rain dampness at a time with no real chance for.
Some folks will add a true insulation layer between the inside and outside layers using a variety of materials such as sawdust perlite and vermiculite.
Whereas the second layer thermal insulation of cob mixture consists of clay sand straw and water.
You would place a bond beam at the top of the cob wall ideally concrete and rebar or alternatively airplane cable connecting all the members of the roof in one big circle they way the roof is designed is to act in compression while exerting force on the bond beam which will act in tension.
About 40 of rain yearly much in the form of snow which is on the ground november april.
Once the hearth or base has been developed a builder may begin to construct the wood fired pizza oven dome.
In building an oven dome we need to have a thermal mass layer and a thermal insulation layer to hold good heat for baking.
The area containing the cob oven and seat isn t protected from the rain.
The best solution to protecting cob buildings from heavy rain is a good roof with a wide overhang combined with a high foundation to protect the bottom of the wall.
Building the living roof.
I m in nh usa.
Once the perimeter of the roof was covered with sod we covered the rest of the roof.
If you want to build a close replica of our cob oven here are the materials you ll need.
Since i already wrote about cutting sod for my roof i will describe how the sod was loaded.
The dome is constructed over an oven hearth which is created from cob stone slabs brick or fire bricks.
For a 27 oven you ll need a foundation much larger than that however.
That s about a 58 diameter foundation.
Take a look at this wonderful cob oven with cob seating area frenk and nicole built.
Doing the edge was the trickiest part since i had the fold the epdm underneath itself and leave a little bit exposed to protect the edge logs.
1 pallet of rocks or urbanite go select attractive rocks that match your design aesthetic concrete for footer ask person at home improvement store to get you enough concrete rebar for a 62 x 62 slab.
They showed me around their fabulous cob creations not to mention plying me with vinho frisante and humous.
