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I have created a first floor room with a garage door. When I add my foundation the stem wall will not create an opening for the garage door. Instead, the garage door seems to rest on top of the stem wall, just like the rest of the walls of my garage.
If certain conditions are not met, a stem wall will not recognize a garage door above it, and will treat it like other doors, which rest on top of the stem wall. To create a foundation in which the stem wall breaks and allows the garage door to reach the slab floor of a garage, follow the procedure below.
If you skip this step, and do not define the room as a Garage, then Home Designer will treat the garage door as it does all other doors, and have it rest on top of the stem wall.
As you have probably noted, this process must be followed exactly in order for the foundation to recognize the garage door and form an opening for it.
In brief, you must first build the first floor and define the room as a garage. Then, you must build a foundation. The first floor room must be defined as a garage in order for Home Designer to build the foundation correctly. Once the first floor is built and the foundation is complete, the last step is to add the garage door.