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Roll up storefront garage door6/13
I've been asked to build a roll up garage door. I'm pretty confident in how I'll go about it, frame and panel, through tenons, glazing in the upper sections, etc. In into case I thought it may make a good discussion. This unit will be 12'wide 16'tall
I think you are asking about a conventional sectional overhead door, with horizontal panels hinged to each other, following a track, pulled by a motor.
If so, you must think about the 12' width laying flat up in the air, and preventing sag. Use real heavy duty hinges. The overhead door people typically use ones that are made from old beer cans or the like. They deform, the alignment goes to hell, and your phone rings.
That is a large door = lotta weight.
In addition to what David said, I would also be concerned about the sag in the open position. My guess is you will be making sections 2'x12'. If those section sag the door will bind, buck and pop as you close it. This is akin to bending a piano hinge and trying open and close it. Also, that door is going to weigh a lot and you are going to need very large springs to open it.
You need some metal to keep it from sagging.
We've done a couple of them. What everyone has said about watching for sag is right - I'm sure you'll have that covered. Accounting for that - and wind deflection - will add up to a significantly heavy door.
We learned from our first experience to hook up with the overhead door guys ahead of install. They came by the shop and weighed the parts, and ordered springs etc accordingly. Much smoother than the first time we did it, when the installers were surprised - and the contractor was even more surprised by the upcharge.
We've also repaired one (that someone else made). Had to make a new bottom panel, which had rotted due to water trapped between the rubber seal at the bottom and the wood. I'm sure you've thought through species and finishing, but do make sure your weep holes don't get covered or filled by someone else.