Garage Footer/slab Question

rico55

I am designing a house that has a an attached garage. It is a two story house, with a single-story garage. What type of footer should the garage have? Should it be the same size and depth as the rest of the house? Do I need to leave a gap in the stem wall where the garage door is?

mikesewell

Talk to a local geotech, or a structural engineer. We don't know what your local soil conditions are.


It's a good idea to have the elevation of the stem wall high enough to keep the framing off of the ground. This usually means that you have to make a cut in the wall for the apron and the overhead door. A cut in the wall is not difficult, nor is it expensive.

I hope that this helps,

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shopdust

A lot depend on your local codes (interpetation) I.E. In most areas your footers would be 15" X 18*" in the two story area, 12"X12" in the garage area. These are the dimensions of the footer going into undistrubed earth or compacted fill, not including the 4 inch (nominal) slab. A quick call to your local building authority will tell you what's req'd in your area.
I would pour it as one unit - monolith

*Or the depth will be below the frost line, again that is a local determination.

PipeGuy

Do you have an architect?

JustaFramer

Those are some huge footings depth wise. However is all has to do with the soil. Over the years I have seen 6" deep x 12" to 8" deep x 12"-24"

shopdust

Ayyyup!
jumped into many a trench with a square tipped shovle to clean out spill or extend the depth beyond what the inspector thougth was fill. Earthquakes (and the subsequent lawsuits) are big issues in California.

JustaFramer

It won't suprise me if WA will go that deep in the future one good quake and we will again radically reengineer.

shopdust

Some 'experts' think the Pacific NW is overdue. That little shake in Seattle made folks think.

Some jurisdictions in Calif. are now allowing 2d stories on remodel residences with 12' x 12' footers over 5 years old. Concrete seems to get harder?
I'm aware of the 90% at 28 days mix, wonder when it tops?

Tom R

I think it's 'years and years', - - might wanna get Justaframer's answer.

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JustaFramer

I am still learning with concrete. I work for others on this trade. I have done alot of prep for pours. Set up forms run some rebar. I think I am wrong but it's 65,000-90,000 psi in 28 days. but takes still takes a few years to fully cure.


way over shot that one 3,000 at 28 days. High strength considered at 7,000-14,000 psi

JustaFramer

http://www.cement.org/basics/concretebasics_faqs.asp


Here is a good fact sheet (I think) on concrete.

mikesewell

It is.

Portland Cement Association
www.cement.org

American Concrete Institute
www.aci-int.org

National Readymixed Concrete Association
www.nrmca.org

Concrete Reinforcing Steel Institute
www.crsi.org

ACI membership is a good investment. ACI 318 Building Code Requirements for Structural Concrete gives you the information that you need to meet the Code.

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