FAQ: How To Use Sonotube Concrete Forms?

Do you leave sonotube in ground?

No, it’s not a problem to leave the Sonotube and its plastic “Square Foot” (like these) in the ground forever.

Do you put rebar in sonotube?

To support a beam for a residential deck, does a Sonotube pier need any rebar? A. We usually recommend that a minimum of two pieces of #4 rebar be placed vertically in an 8-inch-diameter concrete pier supporting a structure. A larger-diameter pier should have four or more pieces of vertical rebar.

How deep do you put Sonotubes?

I dig my holes 2 feet in diameter so that I have some flexibility if I need to slightly adjust the placement of the tube. Also, the wider the hole, the easier it is to remove dirt as I dig deeper. When I reach our local frost depth of 48 inches, I add about 6 inches of stone to the bottom of the hole.

Are concrete form tubes reusable?

Made of 100% recyclable plastic, Geotubes plastic concrete form tubes are reusable for up to 100 castings. Tubes can be used for various applications in construction industry, including pouring concrete bases at bottom of light poles.

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Should deck post be set in concrete?

There are several ways to set deck posts; we recommend attaching the posts to concrete footers above the ground. This helps to prevent wooden posts from rotting. Set footers a minimum of 6” below the frost line for your area to prevent movement during freezing temperatures.

Can you leave concrete forms in the ground?

The forms or “molding” that holds the concrete in place until it dries should be left alone for at least two days to ensure that the concrete is completely dry. If the forms are removed too soon, the concrete can begin to sag, crack and collapse, especially if conditions like temperature affected its strength.

How much concrete do I need for a 10 inch sonotube?

For example, a sono tube with a 10” diameter and a 4′ depth requires 0.08 cubic yards of concrete.

How long does it take for sonotube cement to dry?

Usually 24 hours, but concrete masonry specifications will dictate. Maximum recommended time before stripping is five days. Does the Sonotube form have to be stripped from the column after the concrete has cured?

How many bags of concrete does it take to fill a sonotube?

16 cubic feet / 0.6 cubic feet / per bag = 27 (80#) bags of concrete mix.

How many posts do I need for a 12×16 deck?

A standard deck will need four footings parallel to the house, but they will need to be temporarily braced by 6 inch-by-6 inch posts.

Are Sonotubes necessary?

I also agree that you don’t need the sonotube. For what you’re doing it will only weaken the lateral strength. If your local soil keeps collapsing into the hole a sonotube would help with that. Also, you can use a foot of sonotube to just make what you’re doing look neater.

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How do you build a deck without digging?

Option #2: Build a Deck Without Digging Holes Using Post Anchors. A post anchor is a bracket designed to hold a post with flanges underneath. Instead of digging, the flanges are driven into the ground by hammering on a bit inserted into the bracket with a sledge or a jackhammer.

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