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This seems to be a recurring discussion topic in many build threads, so I thought I would start an individual discussion topic for it. There are many strategies that seem to be adopted here from drain tiles under the hearth insulation to waterproof barriers on the slab materials. The ultimate approach seems to be a roof structure over the whole oven.
For my own build in sunny Southern California where I only need to worry about rainfall for a couple months out of the year a tarp may be my best strategy during winter. But I want to incorporate some design features to prevent saturation of the hearth bricks and the underlying vermicrete layer embedded in the slab. I did create five .840" diameter drain holes in the area under the hearth and siliconed some fiberglass drywall tape over the openings to prevent the wasps from setting up house in there. Before I add the fibrous insulation blanket layer I plan to add a ramp of mortar around the dome ~5" wide and 1/2" tall, covered with a waterproof barrier like RedGuard or an asphalt product to help prevent any water collecting on the exposed edges of the flat oven slab from migrating directly into the highly porous sand/fireclay layer under the hearth stones. The stucco layer over the top of everything is the last line of defense and I plan to use a waterproof coating for that. There seem to be quiet a few on the market. Are there any that folks would recommend that can be tinted to provide a nice uniform non-sanded stucco finish kind of like a plaster look? I plan to use the same finish on the CMU structure holding up the oven, bar, and prep counter.
In the area where the stucco interfaces with the chimney stack, if I use a double-walled chimney can I just silicone caulk the stucco to the outer wall for a waterproof joint there?
What other areas of the oven have you all found to be water intrusion risks that may be relevant in a normally dry climate with short bouts of intense rain? The super el nino we are gearing up for may make for some intense storm later this year, so I want to take appropriate precautions.
For my own build in sunny Southern California where I only need to worry about rainfall for a couple months out of the year a tarp may be my best strategy during winter. But I want to incorporate some design features to prevent saturation of the hearth bricks and the underlying vermicrete layer embedded in the slab. I did create five .840" diameter drain holes in the area under the hearth and siliconed some fiberglass drywall tape over the openings to prevent the wasps from setting up house in there. Before I add the fibrous insulation blanket layer I plan to add a ramp of mortar around the dome ~5" wide and 1/2" tall, covered with a waterproof barrier like RedGuard or an asphalt product to help prevent any water collecting on the exposed edges of the flat oven slab from migrating directly into the highly porous sand/fireclay layer under the hearth stones. The stucco layer over the top of everything is the last line of defense and I plan to use a waterproof coating for that. There seem to be quiet a few on the market. Are there any that folks would recommend that can be tinted to provide a nice uniform non-sanded stucco finish kind of like a plaster look? I plan to use the same finish on the CMU structure holding up the oven, bar, and prep counter.
In the area where the stucco interfaces with the chimney stack, if I use a double-walled chimney can I just silicone caulk the stucco to the outer wall for a waterproof joint there?
What other areas of the oven have you all found to be water intrusion risks that may be relevant in a normally dry climate with short bouts of intense rain? The super el nino we are gearing up for may make for some intense storm later this year, so I want to take appropriate precautions.
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