Hello Brian! Many thanks for your response. Please confirm my understanding of Bldg Code 18.104.22.168.4 a & b. My understanding (ie., applies to living space directly above garage) is that stairs that access into the living space and the living space cannot be exposed to gas or exhaust fumes in the garage area therefore access must be separated by way of a wall with sufficient barrier and the door separating must be weatherstripped as an effective barrier. This of course is assuming there is no door at the top of the stairs accessing the living quarters (ie., top of stairs would provide full view of living quarters).
Your a wealth of info. Bravo! Have one more question! Although this is not related to the living quarters. If the the garage portion is approx. 28' wide with 3 - 8' garage doors are metal lentils required for each or is a wood headers sufficient?
You are very welcome Tammy. Steel is rarely needed in residential construction unless you are building a home where the cost is in the millions. It is hard for me to answer whether steel is needed without knowing exactly what weight is being supported above these door headers. But, typically wood will do the job, they just need to be sized appropriately by calculating the weight above that they are supporting. In a typical residence, the loads are not that great and wood can be used for the headers. The headers are typically called LVL's because they are made of laminated veneer lumber which is stronger than typical 2x lumber.