Re: Rockland County, NY 36" build with pictures.
Mikku: I do worry about frost heave, but a few things:
1. Your recommendation that I dig a 5 foot square hole and then pour a base slab three feet below grade is just crazy mad-talk overkill, and leads me to believe that some of your other advice may be overkill too.
2. Why would frost not heave a sonotube up like you say it would a wood girder? Wouldn't there perhaps be less friction on wood than on concrete?
3. Nothing is going to come anywhere close to "popping out of the ground" around here, even if concreted in ABOVE frost level.
4. Many people here have built their ovens on slabs ON grade. That's actually the recommendation. In another thread, I questioned if that was proper, and annoyed some people with my arguments, but eventually realized that even if the slab moved, that the hearth, if properly reinforced, would retain its structural integrity. The worst that would happen is that the oven will go a tiny bit out of level. I'm taking the EXTRA precaution of going below frost depth.
5. Will my stand not move a millimeter for 30 years? Probably not, but it's not going to move any more than most structures being discussed here.
6. Are my posts going to last forever? No, but probably they will last as long as the oven itself remains in functional repair. If not, in 15 or 20 years I can replace one or two, if I have the strength to dig a hole at that age.
7. Telling me to worry about pressure treated lumber coming near my food is bizarre! Between the wood and the pizza will be 3.5 inches of concrete, 2 inches of insblock insulation, and 2.5 inches of brick. People use the railing caps of my pressure treated lumber deck as standing tables all the time. There is only a coat of paint and a paper plate between that wood and their food. No-one has been poisoned at my house yet. Now even the insulation and bricks are made of potentially hazardous materials, but worrying about them being poisonous is almost as bad as worrying about being killed by a dictator or the weather. It sadly happens, but you can't stand around worrying about it.
Regards,
Ron
Mikku: I do worry about frost heave, but a few things:
1. Your recommendation that I dig a 5 foot square hole and then pour a base slab three feet below grade is just crazy mad-talk overkill, and leads me to believe that some of your other advice may be overkill too.
2. Why would frost not heave a sonotube up like you say it would a wood girder? Wouldn't there perhaps be less friction on wood than on concrete?
3. Nothing is going to come anywhere close to "popping out of the ground" around here, even if concreted in ABOVE frost level.
4. Many people here have built their ovens on slabs ON grade. That's actually the recommendation. In another thread, I questioned if that was proper, and annoyed some people with my arguments, but eventually realized that even if the slab moved, that the hearth, if properly reinforced, would retain its structural integrity. The worst that would happen is that the oven will go a tiny bit out of level. I'm taking the EXTRA precaution of going below frost depth.
5. Will my stand not move a millimeter for 30 years? Probably not, but it's not going to move any more than most structures being discussed here.
6. Are my posts going to last forever? No, but probably they will last as long as the oven itself remains in functional repair. If not, in 15 or 20 years I can replace one or two, if I have the strength to dig a hole at that age.
7. Telling me to worry about pressure treated lumber coming near my food is bizarre! Between the wood and the pizza will be 3.5 inches of concrete, 2 inches of insblock insulation, and 2.5 inches of brick. People use the railing caps of my pressure treated lumber deck as standing tables all the time. There is only a coat of paint and a paper plate between that wood and their food. No-one has been poisoned at my house yet. Now even the insulation and bricks are made of potentially hazardous materials, but worrying about them being poisonous is almost as bad as worrying about being killed by a dictator or the weather. It sadly happens, but you can't stand around worrying about it.
Regards,
Ron
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