Building codes used to stipulate that the floor of an attached garage be four inches lower than the floor level of the house.
Rebar spacing concrete garage floor.
Not all surfaces need concrete rebar reinforcement but adding it makes concrete stronger and more resistant to large cracks.
Today s residential building code does not include this requirement.
There are many variables that influence the decision of how much space to leave including the maximum load the slab is likely to have to support the bearing capacity of the soil the diameter of the reinforcing rebar the likelihood of frost heaving the slab and whether or not the slab is on a level grade.
5 8 barrier pex can be used for larger projects where high btu load is present due to lack of proper insulation larger than normal slab thickness or special project considerations.
Concrete rebar calculator plan view diagram round measurements to 1 32 1 16 1 8 1 4 1 2 running bar points length left to right.
1 2 oxygen barrier pex is the most popular size used for radiant floor heating in both thick and thin slabs.
There s no generally accepted rule of thumb as to how to space rebar in a concrete slab.
Concrete surfaces expected to carry heavy trucks or machinery do need concrete rebar reinforcement.
Make sure rebar is in the center of the slab or close to it.
Pour 6 fiber reinforced concrete over it.
You will be able to add radiant floor heat any time.
If you are installing a concrete garage floor patio driveway sidewalk or support columns you should consider using reinforcing bars as shown in figure 1 or as they are termed in the industry rebar throughout the slab.
Then use 1 2 pex tubing and create about 5 floor heating circuits bring all of them to a convenient access point in the shop.
Get your rebar grid down i would use 1 2 on 12 center.
This size is adequate for all small to medium size jobs both in residential and commercial projects.
The rationale for requiring this little step was that it would prevent spilled gasoline gasoline vapors and carbon monoxide from getting inside the house.
Rebar reinforcement has been used to provide concrete with the support necessary to withstand tension forces for over 150 years.
