Readers ask: How Thick Should Concrete Be For A Garage?

What kind of concrete do you use for a garage slab?

The IRC requires that slabs be built with concrete with compressive strengths from 2500 to 3500 psi, depending on the climate. ACI goes further and recommends 4500-psi concrete for garages in the northern half of the country.

Do you need rebar in a garage floor?

No, rebar is not required. Garage floors are poured last. Generally the thickness is usually about 4″ minimum plus. Many builders will not use rebar, nor do many provide control cuts.

How deep should foundations be for a garage?

The depth of the foundations are a minimum of 750mm deep but the actual depth is determined on site depending on the soil conditions. The local Building Control officer will advise when he is satisfied with the depth. The width of the trench is dependent on the thickness of the walls.

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Can I pour a 2 inch concrete slab?

If done properly, new concrete can often be poured right over an existing slab. For this to be feasible, the contractor needs to pour at least 2 inches thick, use smaller aggregate, and incorporate reinforcement such as welded wire mesh or fiber mixed into the concrete.

Is gravel needed under concrete?

Whether you pour concrete for a walkway or patio, a strong gravel base is required to prevent the concrete from cracking and shifting. Gravel is especially important in clay soil because it doesn’t drain well, which results in water pooling under the concrete slab and slowly eroding the soil as it finally drains.

Do I need rebar in my concrete slab?

Rebar is not necessary for every concrete project. The general rule of thumb is that if you are pouring concrete that is more than 5 inches in depth, you are probably going to want to add in some rebar to help reinforce the entire structure.

Which is better rebar or wire mesh?

Rebar remains stronger and ensures consistent contact in the soil where as wire mesh is unpredictable and often results in a week concrete foundation.

Can I build a garage on a concrete slab?

You may want to consider a 6″ thick slab for larger vehicles such as trucks or RVs. For a garage WITHOUT a floor – BUILT ON SITE: Prepare a level concrete slab at least 4” thick and to the exact, outside, dimensions of your garage. You may want to consider a 6″ thick slab for larger vehicles such as trucks or RVs.

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Does rebar stop concrete from cracking?

Steel reinforcing bars and welded wire reinforcement will not prevent cracking. Reinforcement is basically dormant until the concrete cracks. After cracking, it becomes active and controls crack widths by restricting crack growth.

Do garages need foundations?

While for sheds, a concrete foundation is optional most of the time, a garage foundation is essential. It’s best to plan for pouring a concrete garage foundation before you begin building.

What size footings do I need for a garage?

Dig trenches for your footings around the perimeter of your garage. Local building codes will specify the minimum depth and width of your trenches, but in general, the trenches should be at least 12” – 18” wide and minimum18” deep.

Do you need planning permission for garage?

In the UK, it’s a fairly simple answer. Planning permission is not required for a detached garage or car port but there are some rules that need to be met. The garage has to be used for domestic purposes only. You can‘t build a garage and then use the extra space as a commercial garage.

Do you need rebar for 2 inch slab?

Rebar should have a minimum 2″ embedment in the concrete. 2″ of concrete from the outside of the rebar to the surface. If your slab is going to be subjected to enough load to need rebar it will also need to be thicker; 6″ or 8″. depending on your engineer’s design.

Do you need rebar for 4-inch slab?

No, you do not need rebar for a 4inch slab of concrete on grade. A 4inch-thick slab cast on the ground and in permanent contact with it will float and rebar is not required. Rebar is recommended on concrete measuring 5 – 6 inches thick.

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How many bags of concrete do I need for a 10×20 slab?

A 60-pound bag yields. 017 cubic yards, and an 80-pound bag yields. 022 cubic yards. For a 10 x 10 slab, you would need 77 60-pound bags or 60 80-pound bags.

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