I inspected a single story house with an attached garage built in 1961 in OH. I have a question about a saftey concern with the fuel vapors traveling into the basement. See photo attachment. At the door from garage to the house is a stair landing. The main house is 3 risers up and the basement is 10 or so risers down. Also, the wall between the house and garage was constructed of wood studs and painted fiberboard. This is what I reported: *Although this house was likely built according to code there is a present issue that the owner should be aware of. The issue is that the garage floor is at the same level as the house and there is a potential for gasoline vapors traveling down into the basement should they become present in the garage. As a minimum the owner should ensure the weather-stripping and sweep is very tight fitting and will prevent vapors from traveling into house. Additional considerations would be the addition of taped drywall and a 20 minute fire door that leads into the house. See excerpt from National Assoc. of Certified Home Inspectors. *Did I report this correctly? And at what point do you think there is not a problem with the difference in height between the garage and the main house floor? I assume the garage floor needs to be 18" below the main floor to be considered safe.