I did an inspection the other day on a home that involved a double car garage with cement floor. When I got to the basement I was surprised to find the garage had a full sized room underneath it. The support consisted of plywood decking supported by 2 X 8’s with 10’ 6" span to steel beam which had one steel center post. My main concern was with the 2 X 8’s, which had been notched at the bottom where they rested on the steel beam. This would make them the same as as 2 X 6 because of notch, which according to Ontario building code your not even allowed to do.
My recommendation to the homeowner was to have a structural engineer assess structure if he was going to purchase the home. I was wondering if anybody had come across a similar case and what your finding were. According to Ontario Building Code you are allowed to have cement topping on supported by ceiling etc. but am pretty sure this would not apply to having double car garage?