Any tips from those of you that have built or used this style of door?

Not exactly the same, but the main hangar at Andover NJ has a concrete
floor with steel tracks in it. The doors (which are extensive) consist
of at least six pieces say 10-12-foot wide. There were barn-door
rollers above and (I think) below. Sliding them open was a breeze, and
you could expose a limited amount of the hangar if you chose. I'm not
sure what would happen in a severe winter--would the bottom track get
frozen up?

all the best -- Dan Ford
email: (put Cubdriver in subject line)

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