In Phoenix them there Fume Barriers are generally 5 feet from the wall…
ROTFLMAO 
Very good Dale.
If the garage slopes down it is not needed.
…yeah, but the tire didn’t go through the wall–it stopped!!
Brian,
I thought this topic came up before and forget the answer.
In this area, especially Brunswick, Maine, it is mandated to have the garage floor a minumum of 4" lower than the main floor of the house and also require a landing outside the exit door of the house which has to be out-swinging, and have a landing of at least 3 feet depth by five foot wide before the step down.
Now if you can tell me where I saw this at one time, then we will both know.
Maybe someone else can help. I tried to find it in local codes and NFPA, IRC,and ICBO with no luck as to be able to pin point a listing to that requirement.
Marcel 
David…
You never answered the question. I’d like to know also. Please let us know the source of your diagrams.
Thanks!
Jeff
That is from The Illustrated Home book/CD…http://www.nachi.org/inspectiondepotillus.htm . I have the much cheaper B/W version that I use all the time for illustrations.
Kansas City - In about 65% of houses (new or old) there will not be a tire stop or step-up into living area unless its a house with steps from garage to house. Houses that are Split-level, raised ranch, Trilevel, etc usually go from garage directly into finished family rooms. Interior floor at same height.
But there is to be a slope from house door to garage overhead door.
One small step for mankind and one big step for humanity and livelyhood and protection of the living environment. I think that is reason enough.
Marcel
I’m with ya Marcel 
David… That illustration is from my dearborn inspection book for Insulation and Interiors. Where can you obtain the illustrations?
Chris