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This is a rough guide to repairing cracks in a clay or cob oven. See details below.
When wetting the cracks it is best to use the light mist setting on a sray hose nosel. You don't want to erode the surface with the water. The idea is to get the water to penetrate the material without wearing it away.
- If your oven only has superfical plaster cracks you should be able to use the oven as soon as the cracks are dry.
- If you are repairing cracks that go all the way through the oven, realize the surface of the patch will dry first but the inner material is still wet. In this case it is better to wait the 1-2 weeks mentioned in the video.
This video ended abruptly as the repair took longer than anticipated and the wrap up and finishing of the demo got cut short. I plan to make a more comprehensive video in the future. See more details below.
MATERIALS:
Thermal Cob = 1/4 clay rich subsoil + 3/4 concrete (course) sand
Earthen Plaster = Thermal Cob + fibers
Slip = Thick clay suspension (disolved clay + water)
Thermal Cob is used in repairing cracks that go all the way through the oven. These cracks should be repaired as soon as possible. If your oven is cracking every spring this means you likely have a problem with frost heaving and you should address the cause which is likely site drainage of the foundation.
Earthen Plaster is used to repair superfical cracks in the outer plaster layer.
If you have any questions or comments please leave them in the comments. Thanks for watching.
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