Give me a chance of success here...(you garage door pros)
I have an Al door, 18+ ft?, 20 years old, that bows in the middle
(when the door is in the open position). Because of it, the door
'bangs' when the door is shut. The bang is caused by the drooping
door "snapping" straight and it begin the trip downward around the
bend in the door race.. Sometimes it doesn't flex straight thou and
the door fails to close (it jams and the motor resets and rises). The
upper panel, which bows, is stiffened with an 18 or 20 gauge V'd metal
beam. It screws on.
Do you think it's worth a try to "rebow" (in the opposite direction)
this support piece? Can it even be done? I was thinking that I could
remove it and bend it back ( create an up bias) with some heat and
force. Has anyone done that?
I assume these beams are sold. Maybe I could just buy a new one
Not at all likely w/o having it buckle imo. I'd give far less than 1%
odds w/o a forming machine.
Don't know whether they're considered replacement parts or not altho
possible I suppose.
Actually, as write this, what I'd probably try would be to place shims
of varying thickness under it to recreate the straight edge from end to
end--try a few washers behind it in the center as a starter and see if
helps; if so you can get more precise...
(Thanking my lucky stars I don't have the house w/ the single
double-wide garage door any longer to have the problem... :) )
When My dad had that problem he just bolted a piece of angle iron to
the back of the offending panel. He did that in the '60s and it was
still working well when he died in 2001, & I'm pretty sure the present
owner still is using it.
The problem is not that the brace is bowed. Once you remove it from
the door, it will be perfectly straight.
The problem is, the brace is not adequate to support the door. Steel
comes in up to 20ft lengths. I would get a piece of light 1-1/2" steel
angle and bolt it to the back of the door as additional bracing.
Probably not--over 20 years the original strongback probably has taken a
fair amount of set.
It undoubtedly was initially; it's simply "taken a set" w/ time. It
could've been stronger, undoubtedly, but if it made it 20 years odds are
the door will have failed elsewhere by then, anyway.
The angle is another alternative, certainly; a longer leg 1x2 would do
more stiffening at the same additional weight, though.
I'd still suggest trying the shim correction fix first however for two
reasons -- a) it's a cheap 'n cheery fix if it works, and b) it doesn't
add additional weight to also support that the added angle does.
But, if shimming doesn't make enough, that's the next step certainly.
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