[DanEC]

I've had a couple of these done and both were by regular garage door companies. I'm not sure about the issues with the hurricane door bracing. I would keep checking around with various companies and I think eventually someone will step up to the job. Other than if you decide to go with a side mount operator (which with a 9'9" ceiling is just about mandatory) there really isn't much special about the set up. On some garages with 12 or more ft of ceiling height they sometimes install an additional door panel on top as an adaptive measure. This wasn't necessary on either of mine which were only 10 ft and 10' 6" high. Generally the outside of the door has to be free of handles and grips becauce the door track doesn't angle back as far at the top of the door opening and the door goes more straight up past the head instead of falling back to the inside as it rises up.

I think the main problem is the 9'9" ceiling height which will get the car up for work underneath but is pretty marginal if you intend to park one car over another. At best the door and track are still going to hang a few inches down from the ceiling. I hope you're garage is fairly deep. The 10 ft ceiling I had was about as low as I could get by with and I parked a 66 Corvette over a 67 GTX with it.

I think you're assumption of raising the door from 24" clearance to 4" clearance is reasonable. Neither of the installations I had done raised the door the maximum amount. On the earlier 10 ft ceiling I actually went back and raised the track myself about 1' to 1'1/2 inches at the door. I slid the track up at the door to where the bottom roller was just even with the bottom of the track since any track extending below the roller doesn't do anything anyway. At the back of the track it was pretty simple to loosen the bolts and raise the track up 3 or 4 more inches. The OH track ended up with a slope but that didn't hurt anything. So I would stress to the installer that you need the OH track and the door sucked up absolutely as close to the ceiling as possible and then try to be there when they do the work to make sure.

Good luck.