A garage slab level with a house floor has been illegal here for over 30 years.
The floor of the garage is caled.
Typically there will be two 2 12 inch louvered metal vents co located just above the sill plate and usually near the vehicle entry end of the garage.
A floor s framework is made up mostly of wooden joists that run parallel to one another at regular intervals.
This is in many cases simply a drain that enters into a catch barrel underneath the garage floor.
I have been searching for requirements for residential garage ventilation.
The barrel will usually have holes drilled all around its exterior that allows water and liquids to simply be absorbed into the ground surrounding the barrel.
Floor joists are typically 2 by 8s 2 by 10s or 2 by 12s.
Residential garages typically have space for one or two cars although three car garages are used.
Some newer homes have manufactured i beam shaped joists.
The slope of the garage floor does nothing to alleviate the potential for vapor build up and if the requirement were for the drainage of spilled gasoline it would not be allowed to slope to a drain.
Often a garage may utilize a floor drain.
ˈ ɡ æ r ɑː ʒ r ɑː dʒ r ɪ dʒ us.
Genuine garage floor epoxy creates a durable long lasting attractive coating for the garage.
ɡ ə ˈ r ɑː ʒ r ɑː dʒ is a walled roofed structure for storing a vehicle or vehicles that may be part of or attached to a home attached garage or a separate outbuilding or shed detached garage.
As i understand this is required due to combustible storage such as paints thinners gasoline as well as the potential car running with vehicle door closed not.