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djk 01-10-2012 07:16 PM

garage floor
if the garage is attached would the concrete slab be structural?

nealtw 01-10-2012 08:31 PM

Need a more specific question.

BridgeMan 01-11-2012 01:04 AM

Maybe. Maybe not. Depends on what you've got, and what your definition of structural is. In terms of supporting vehicle and pedestrian live loads, garage floors are indeed structural. Without them, everything would quickly sink into the dirt underneath, and be a real pain to easily extricate.

mudmixer 01-11-2012 03:43 PM

djk -

It is not necessarily a "structural" slab. The last 4 homes I lived in had an attached garage (3 were 2-car and the other was a single car). The slab was free floating (no doweling) inside the stem walls, was unreinforced, but a couple did have wire for crack control. The slabs were 4" or 5" thick that were placed on a partially compacted base. This is very common construction where there is a desire for a stem wall to project about 4" to 8" above the floor level.

As a structural engineer, I can say these were not designed as structural elements and there were no structural requirements, but built by a home builder and concrete contractor with no specific reinforcing or connection requirements. - It just works.

No cars stuck in over many years and two of the four did not even have any cracks because they were not attached to the stem walls. It also makes for a garage that is easy to keep clean from debris and slope the slab as desired.


nealtw 01-11-2012 06:30 PM

Still depends on the question, I can think of two cases when it is, 1 when there is a bonus room below, 2 When the engineer decided the back wall of the house should have been a retaining wall, he tied all the walls together with so much rebar in the floor you would have thought it was a bridge. I am sure there are more. I would like to have the whole question.

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