I'm working on a project to build a gazebo that weighs about 100 lbs, and I need to create a concrete footing for it. The problem is, because of space restrictions, I have to keep the diameter of the footing to a maximum of 9 inches. I'm not sure where to find a sleeve or bucket that fits this requirement and is deeper than a standard 5-gallon bucket. Should I simply pour the concrete directly into the ground without using a bucket? Any advice?
2 Answers
You can find tube forms designed specifically for this kind of job. If you really need it to be 9 inches wide, you might run into some trouble since 8 inches is more common. However, if you find a 10 or 12-inch form, you can simply cut it down to size and close it up to fit your needs. Just remember, when setting this up, you typically want the hole to be larger than the form itself for proper backfilling. But if you need the concrete to go above ground, using a form is helpful.
Dig down a few inches deeper than you really need, and make sure to flare the bottom a bit so it doesn't get pushed up by frost heave. Then place a couple inches of gravel at the bottom before pouring the concrete directly into the hole. You might want to let it cure undisturbed for a couple days to a week after pouring. If the soil's loose, use a shop vac to clean up any debris, which will help with the pour.