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Old 01-26-2009, 07:40 PM   #1
pattenp
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Default Fix for a 18' wide sagging garage door

I have an 18’ X 8’ garage door that when opened you could see that the top panel sagged in the middle even with having a 4 inch wide stiffing strip. Over time the top panel kept the bow and when the door was shut there was about a ¾ inch gap between the center of the top panel and the top weather strip. I know the easy way to take care of the problem would be to bow the weather strip to close the gap but I have this thing about stuff being visually straight. So my solution was to create a tension truss so to speak using a 3/32” cable. The cable is connected at both ends of the stiffening strip and then held out at the center by a short piece of metal channel. I put in a turn buckle to tighten the cable across the top of the door to keep the door flat when closed. It works well, so I just wanted to share this others who may have this same issue with a wide door.
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Old 01-26-2009, 07:48 PM   #2
rinker1
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Default Re: Fix for a 18' wide sagging garage door

Great idea, that's a common problem with wide doors, I've even seen it in 16 ft wide doors.
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Old 01-26-2009, 08:21 PM   #3
krooser
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Default Re: Fix for a 18' wide sagging garage door

I had an 18X8 built for my new garage in 1975. the door was of a wood-composite construction. I lived there for about 8 years and never noticed any problems.

But your solution seems to be the correct answer.
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Old 04-14-2012, 05:58 PM   #4
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Default Re: Fix for a 18' wide sagging garage door

Genius! I hope you don't mind if I copy.

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Old 04-14-2012, 06:48 PM   #5
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Default Re: Fix for a 18' wide sagging garage door

The miracles of triangles. Have a newer 17 Ft. door and it is OK for now, but that is the best method for correction of the sagging problem.

I have a couple of wooden tool shed doors that have bowed out at the bottom and no longer close flush. Was thinking of running a 1 X 3/8" (spring) bar diagonally with a 2 X 2 piece under it, close to the top, then pulling it in at the bottom with a carriage bolt (to pull the bottom in).

Had toyed with an idea such as your method, but it won't work in my case.

Thanks for sharing.
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Old 04-15-2012, 12:33 AM   #6
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Default Re: Fix for a 18' wide sagging garage door

Interesting - how many teks in that truss? Is the flange mounted correctly down to the door skin?

I've seen some minimal bow in glazed 9100's before, but that's a bit excessive...
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Old 04-15-2012, 08:08 AM   #7
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Default Re: Fix for a 18' wide sagging garage door

Good thinking pattenp!! curious to see how that works for you. The Foamcore door with a glazed top always had a sag to it.. just not noticeable with a ceiling hung operator because with the door closed the operator arm would push the top section tight against the header. good luck!
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Old 04-15-2012, 08:36 AM   #8
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Default Re: Fix for a 18' wide sagging garage door

What a great idea!I have a 16' WD 8500 with no windows and it has about a 3/4" bow after 3 years.I just switched to a 3800 opener and the gap is very evident.I will be trying this fix for sure! Thanks very much for the tip!
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Old 04-15-2012, 09:13 AM   #9
Morrisman
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Default Re: Fix for a 18' wide sagging garage door

Could you not fit some sort of 'ramp' or ledge device fastened to the roof so that when the door is open it slides into the ramp and is held up?
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Old 04-15-2012, 11:24 AM   #10
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Default Re: Fix for a 18' wide sagging garage door

I think it's funny to see this "idea" being used on a modern metal door.
This is how garage doors were made for fifty years or more, when they made them of wood.
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Old 04-19-2012, 04:51 PM   #11
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Default Re: Fix for a 18' wide sagging garage door

Since I have been working on my garage and being up on a ladder a lot, I noticed my 16' door sags in the middle. Putting this on my to-do list. Seems like the more work I do, the more problems I find!
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Old 04-20-2012, 09:37 PM   #12
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Default Re: Fix for a 18' wide sagging garage door

Sixteen foot garage door headers will sag over time. I've seen it on several garages built by local garage builders. I personally wouldn't have a 16 foot because of the sag problem The two new garages I had built over the years have 7' x 9' doors. A coworker built a new garage, and he wanted the 16' door. Knowing of the sag problem, for the header build-up, instead of using the normal 1/2" plywood spacer between the two 2x12 header planks he built up a fabricated (welded) truss from 1/2 steel bar stock. I believe it was 1/2" x 2". Careful attention was paid to weld sequencing so that distortion was minimal, if any at all. He then built up the header on the floor and called an army of friends over to help lift it in place. That garage is over 20 years old and the door header does not sag at all.
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Old 05-22-2012, 12:07 PM   #13
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Default Re: Fix for a 18' wide sagging garage door

The problem I had was not a sagging header, it was the top door panel had a bow in it. My 18' header is made up of two 20" LVL beams with a story above, no sag what so ever.

Oh.. and my cable truss to flatten out the door when closed is still doing it's job very well.

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Originally Posted by bowmard View Post
Sixteen foot garage door headers will sag over time. I've seen it on several garages built by local garage builders. I personally wouldn't have a 16 foot because of the sag problem The two new garages I had built over the years have 7' x 9' doors. A coworker built a new garage, and he wanted the 16' door. Knowing of the sag problem, for the header build-up, instead of using the normal 1/2" plywood spacer between the two 2x12 header planks he built up a fabricated (welded) truss from 1/2 steel bar stock. I believe it was 1/2" x 2". Careful attention was paid to weld sequencing so that distortion was minimal, if any at all. He then built up the header on the floor and called an army of friends over to help lift it in place. That garage is over 20 years old and the door header does not sag at all.
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Old 05-23-2012, 07:09 AM   #14
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Default Re: Fix for a 18' wide sagging garage door

Nice job! I like the sensor location..
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Old 05-23-2012, 12:43 PM   #15
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Default Re: Fix for a 18' wide sagging garage door

The sensor was to prevent the door from being opened when I had a car on the lift. The sensor is now long gone because the door has been converted to high-lift.

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Nice job! I like the sensor location..
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Old 05-23-2012, 01:11 PM   #16
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Default Re: Fix for a 18' wide sagging garage door

Quote:
Originally Posted by pattenp View Post
The sensor was to prevent the door from being opened when I had a car on the lift. The sensor is now long gone because the door has been converted to high-lift.
Good idea and will be swiped by me for my shop door on the lift side..
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Old 05-23-2012, 02:03 PM   #17
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Default Re: Fix for a 18' wide sagging garage door

Here where I got the sensor. http://www.walkeremd.com/Banner-Engi...Fcyb7QodCwTl2g
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Old 05-23-2012, 03:13 PM   #18
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Default Re: Fix for a 18' wide sagging garage door

Thanks... Might be a way to use the original closing sensors for this task as well.. Run the outputs through a flip-flop and trigger a relay? Been away from the tech bench for a while, but I think I would be able to cook something up...
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Old 05-27-2012, 12:48 PM   #19
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Default Re: Fix for a 18' wide sagging garage door

Genius!!! I'm going to do this today!
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