Posted By Alton on 02/04/2008 3:42 PM
DMACELD,
I hear you on the math, but from a designer's point of view, 8' wide garage doors are a hard sell especially with narrow lots that do not leave much space for the parking apron. The large SUV's have a tendency to lose mirrors by hitting the door jambs.
Life is often a choice between form and function. Unfortunately, form usually wins, although that's only partially the issue you raise.
I'm using 2 10' wide doors with 4' space between them. Width for pretty much the reason why you say 8' doors are a problem, and spaced apart to allow for space between vehicles. I'm designing my house and garage to be accessible. The 4' between them will allow enough space between cars to allow a side exit ramp from one of them. I'm going to sell the house after two years and to differentiate it from the thousands of others that are always on the market I'll advertise it as wheelchair and walker friendly. Hence, I end up with a garage almost big enough to be a 3 car but set up for 2 cars. I know I'm bucking the norm, but I've always been a bit contrary. Makes life more interesting.
But what I was thinking with regard to the 90 mph wind load requirement for garage doors is because of the stiffness issue a 16' wide door would have to have additional stiffening over current design. Two 8' foot doors of current design just might meet the wind load requirement and thus make more sense. Or 2 10' doors if there's space.
We lived in Louisiana during Katrina. There were several 16' or 18' garage doors in our subdivision that were in tatters from the wind, which was only something like 50 mph in our area.