I have some questions about under what circumstances footings are needed, and when needed, under what circumstances they must be below frost level.
I live in a mountain area when on occasion, the ground freezes to several feet of depth.
Here is my perception of "the rule" :
"For load-bearing structures, footings must be dug, and in areas where frost-heave is a problem, those footings must be below frost level."
Perhaps this is a correct statement, or perhaps it isn't quite complete, I am not sure. I suppose the main problem that I am having is determining what is a "load-bearing structure." I think some of the fine expertise that we have in this esteemed group can get me straight on this.
I have several small projects in mind. They are listed below, and I am wondering if in any (or all) of the instances, I would need footings and if so, would they need to be dug below frost line?
- Small rock wall flower bed-- I plan to build a very small circle around a flower bed about 5 feet across. I will be using river rock, with an average size of 4 X 6 inches. The little wall or rock border will be about 12 inches high, and about 5-6 inches thick. I would not think the weight would be more than 50 lbs per foot of wall area.
- Concrete pathway-- I plan to build some concrete pathways, about 3 feet wide and I suppose about 4-5 inches thick. It would seem that I could peg some forms to the ground, and pour the walkway with concrete. It would not appear to me that this would be a "load-bearing structure", but I am very inexperienced in these areas.
- Retaining wall for flower bed. This is an area in a limited area of a flower bed adjacent to my house, where I need to replace a small area of a retaining wall, which will be built a sloping area. The entire wall will be about 8 feet in length, and (on the sloping ground) will be about 4 feet high on one end, and will slope to about 1 foot in height off the ground at the other end of the 8 feet. This wall will be built of 4 X 4 pressure treated beams, of .8 retention. There is a bit of "load" here, as the timbers themselves are pretty heavy. At the "high" end of the wall, I would have about 8 or 9 beams, but because of the slope, most of the beams will be less than 8 feet in length (wish I could draw a diagram).
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That's it on the projects. I have a number of questions:
- Would any of these projects require footings ?
- If any require footings, would they have to be below frost line?
- Is rebar required in any of these projects?
- Can the walkway be poured right on the ground, or should I start with a
- Does gravel itself help with the frost-heave problem ?
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Wow, that is a LOT of questions............ so, thanks for any constructive comments and advice !!
--James---