07DuramaxLBZ4x4
New member
- Joined
- Jul 17, 2014
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We are in the final stages of purchasing a home and are interested in getting an estimated $ for building a metal garage. We have found a ball park number for a 22 X 28 metal garage at around $7k, but are unclear how much to budget for the concrete slab. Basically, here is the slab we need to build:
Concrete Installation:
1) Size the slab: You should make your slab 4” wider than the width of the building and 6” longer that it's length. For instance, on a 20' x 30' garage you would make your slab 20' 4" x 30' 6". This is so you don’t break or crack the edge of the slab when affixing the concrete anchor expansion bolts into your slab.
2) Order the Correct Concrete Mix and Amount: Your floor should be a minimum of 4” thick. Make it 6” thick if you are intending large vehicles such as trucks or larger RVs to be parked on it. The concrete should be a minimum of 2500 psi concrete with fibermesh reinforcement added at the batch plant OR #3 rebar on 24” centers. You should also consider going with a concrete mixture of 4000psi along with the extra two inches of concrete if you are intending more than a normal amount of weight.
Be sure to saw cut expansion joints within an appropriate time after the pour is finished or trowel in the expansion joints while the finishing is occurring.
As far as knowing how much concrete to order, you can generally call the concrete company and give them the specs of your slab. They can tell you how much to order. Also, it's a good idea to have a place to pour any spare concrete when your slab is poured. The driver will want to empty his truck on-site. The cost of a concrete slab to be formed and poured, including expansion joints, would run approximately $2.75 per square foot in our local area for a 4" slab on a level site.
3) Footing Requirements: (International Building Code 2000 or “IBC 2000” requirements)
At the same time you pour the floor, you are going to pour the perimeter footings. This is called a monolithic pour (or monolithic slab). Perimeter footings need to be 12” deep (you can include the 4” of floor as part of the 12”) and 16” wide. The footings will have to have two #4 rebars top and bottom, continuous run around the complete perimeter. In our local area, the footings would cost approximately $11.50 per lineal (running) foot.
Using the above numbers and if I wanted a 6" floor it would cost around $3,700. Does that number seem about right or will it end up costing much more that that?
Concrete Installation:
1) Size the slab: You should make your slab 4” wider than the width of the building and 6” longer that it's length. For instance, on a 20' x 30' garage you would make your slab 20' 4" x 30' 6". This is so you don’t break or crack the edge of the slab when affixing the concrete anchor expansion bolts into your slab.
2) Order the Correct Concrete Mix and Amount: Your floor should be a minimum of 4” thick. Make it 6” thick if you are intending large vehicles such as trucks or larger RVs to be parked on it. The concrete should be a minimum of 2500 psi concrete with fibermesh reinforcement added at the batch plant OR #3 rebar on 24” centers. You should also consider going with a concrete mixture of 4000psi along with the extra two inches of concrete if you are intending more than a normal amount of weight.
Be sure to saw cut expansion joints within an appropriate time after the pour is finished or trowel in the expansion joints while the finishing is occurring.
As far as knowing how much concrete to order, you can generally call the concrete company and give them the specs of your slab. They can tell you how much to order. Also, it's a good idea to have a place to pour any spare concrete when your slab is poured. The driver will want to empty his truck on-site. The cost of a concrete slab to be formed and poured, including expansion joints, would run approximately $2.75 per square foot in our local area for a 4" slab on a level site.
3) Footing Requirements: (International Building Code 2000 or “IBC 2000” requirements)
At the same time you pour the floor, you are going to pour the perimeter footings. This is called a monolithic pour (or monolithic slab). Perimeter footings need to be 12” deep (you can include the 4” of floor as part of the 12”) and 16” wide. The footings will have to have two #4 rebars top and bottom, continuous run around the complete perimeter. In our local area, the footings would cost approximately $11.50 per lineal (running) foot.
Using the above numbers and if I wanted a 6" floor it would cost around $3,700. Does that number seem about right or will it end up costing much more that that?