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Increasing door height to fit tractor
I pretty much have settled on a JD 990 tractor, but the ROPS is a couple of inches higher than the garage door openings, and a foldable ROPS is not available (nor can you take off the ROPS). The headers for the doors are 2x8s, and the door width around ten feet. Any thoughts on replacing the headers with three 2/6s rather than the existing two 2x8s? This is a typical stud framed one-and-a half story garage/workshop that's around 12 years old.
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Increasing door height to fit tractor
I bet if you sandwiched 1/2" thick sheet of 5 1/2" steel between your 2x6's you'd have plenty of strength to accommodate that span, without the extra thickness of 3 2x6's. your header should be double 2x8's with 1/2" sheet of plywood to make it the 3 1/2", so this is same thickness. Of course you'll have to drill the steel to bolt the 2x6's together.
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Increasing door height to fit tractor
What you need for a header depends in a large part on what the header has to hold up. If it is supporting the ends of roof trusses, then plan on something that will handle the load. If it is a non-loadbearing wall (gable end), then not much is needed. Sandwiching the steel plate will help support a lot of load, as well as screwing and gluing the plywood in between the two 2x6's, as well as the plywood sheathing outside and more plywood sheathing inside. Get 10' plywood if that is what your door width is. Avoid joints along the span.
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Increasing door height to fit tractor
Building codes probably apply, so a permit may be needed. We're pretty informal around and everybody knows the building inspector. When we wanted to build a deck, I just asked the inspector what designs he'd approve. He dug out a book and looked up various designs
That seemed like a pretty good way to figure out what works and also be pretty sure that it's going to pass inspection--quick consultation and all for the cost of a $10 permit. The design cost about half of what a building supply store computer thing designed. Some of the books the inspector referred did give details for various types of built-up compared to timber beams for various applications.
In our township, the municipality is responsible for any inspected structure the fails within a year or so, and there's no possible insurance complications. I figure that talking to our inspected saved us a bunch on time and building materials Seemed like a good deal all around.
I'm thinking that it'd be more common for a large garage door to be in a curtain rather than a loaded wall. If so, and there's room above the header, there are probably all sorts of design possibilities that might entirely substitute for a header. If you get stuck for a design and don't need a 10' door, posts could be installed inboard from the existing one to reduce the span (and therefore the header requirement). If your area gets snow and ice, I'd be careful about cutting the clearance too fine.
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Increasing door height to fit tractor
You could make a ramp to raise front of tractor while entering garage,this will lower ROPS enough and save you alot of work!Just a thought.This is assuming ceiling ht will accomodate ROPS.
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Increasing door height to fit tractor
Your local building supply should be able to show you some engineered wood beams. Essentially they are many thin layers of glue laminated plywood and they are exceptionally strong. I don't remember all the numbers but I think a 2x4 or a 2x5 can replace a 2x8 lumber number.
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Increasing door height to fit tractor
Why not take your tractor to a welding shop and have them cut out 3 inches of your ROPS? They could slide another piece of square tubing inside the ROPS and weld it back. It would be as strong as original. That is if the ROPS would still be tall enough to meet the safety feature.
They could even turn it into a folding ROPS, for a little extra money.
Billy
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Increasing door height to fit tractor
I would tend to agree with Mark the strand beam would be the way to go. They were originally an M&B invention.
I guess I should clairify this, it would be the way to go if you don't have any garage doors etc. If you have to replace the doors etc. then it would be much easier to have the ROPs shortened. I recently had to put in 3 doors in my garage/barn and they are not easiest to install. You alway run into problems.
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Increasing door height to fit tractor
If you were to modify the ROPS,would this violate the warranty and/or liability?
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Increasing door height to fit tractor
You can always let some air out of the rear tires!!!
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03-10-2003, 16:11 
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