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Door height is usually 1-1/2 inches higher than the opening cause they don’t account for bottom retainer and rubber seal , Wayne dalton doors are fine but light duty ! Best way for me on steel building or quanza I ask carpenters to frame jambs pt 2x6 on an L gives door solid mount and good...

Try wiring photo eyes directly to opener sounds like that’s the issue maybe bad wire but if sensors are working and you can’t program limits and forces than it’s probably logic board .

Liftmaster 8500 only needs 4 inches from ceiling to top of shaft I sometimes cut out swatch of drywall to fit up inside hardly noticeable, but you are correct as warranty void if installed on low headroom door. If the door works easily manually you shouldn’t have issues and is better than...

100 % that’s the cheapest and most efficient option !

Unfortunately your new drip rail probably doesn’t have the same dimensions as the old one i usually have to manually cut rubber fin to close the door but carefully so you don’t create leaks. Also check that your door is square sometimes they sag over time and need adjustments . Hopefully this...