I am considering a garage with dimensions of 5x10m, with a gabled roof with a slope of 14-16 degrees, where I want to have a fairly large door on the gable side, preferably 4m high and 3m wide.
When drawing in various standard programs, you have to choose a fairly high wall side to "be allowed" to install a 4m high door. For example, a 4.5m wall height is required in one place I have drawn.
I would like to have the garage as low as possible, given the 4m door height and the above.
Does anyone know any tool for drawing frames with glulam trusses (or something else) where one can get a building permit drawing?
I keep coming back to similar questions and there must be over-dimensioning rules for how to build. Often you get the answer that you should have someone calculate it, but there must be countless examples of what works. If you just choose a larger construction, using the same dimensions, then you're safe.
This is basically how the trusses need to look to accommodate a 3m wide and 4m high door. It seems unnecessary to have to raise the entire wall side to 4.5m to fit the door.
A slightly more serious sketch.... draw in 195s but what I'm after is what will definitely be enough. Even if it's some monster glulam beam, it has to work without doing detailed calculations on an optimal solution
However, I recall that nowadays you have to use CE marked trusses, so I suspect you'll need to get an engineer to make calculations and a company to manufacture them. They should be able to provide the drawing you need.
CE marking is only relevant if you are conducting business, i.e., manufacturing and selling roof trusses. It is unlikely to be applicable for personal manufacturing.
The type of roof truss shown is technically a poor one. That's not to say it can't be constructed to hold, but I doubt that particular model will ever be generally described for home builders anywhere.
Look at scissor trusses instead. That's probably as close as you can get, although they also become troublesome with low roof pitches. Hmm, on second thought, they are probably also difficult to dimension generally for home builders...
Otherwise, a hinged truss or frame in glulam (bend) or steel is the way to go, but it's probably specialized and expensive.
If you can sacrifice a bit of width at the top, the sketched trusses can be complemented with braces going from the base up to the collar beam. That would be a strong and good solution. Something like this:
But maybe it doesn't help as dimensions are missing...
We have that type of trusses in our barn. The rafters are approximately 5x5", and the braces are double, perhaps equivalent to 3x4". The barn's width is about 5.5 m and height is 5.5 - 6 m, with a 45-degree roof pitch.
I can probably handle expensive within reasonable limits. I think it should be possible to build a frame that holds with glulam at least? We're only talking about a 5m span. The gable can have standing pillars next to the gate.
A ridge beam in glulam then? Or does that become completely unreasonable?
Exactly such a construction is what I've also thought about. That's often how old barns are built, but it does take up space.
A ridge beam/glulam then? or would it be completely unreasonable?
I initially thought of suggesting that, but then I realized that a 10 m long ridge beam that has to support a flat roof (including snow load) would probably be quite hefty.
If not the entire garage length needs to maintain 3x4 m, then maybe it could be a reasonable alternative?
There are truss suppliers who can produce the kind of trusses you're looking for. Maybe it's a faster, easier, and cheaper solution after all?
