Gaaaahhh!!
I'm going crazy not being able to make my own decisions...
I'm in the process of building a patio with a standard gable roof. I'm hesitating a bit now on how to mount the rafters to the glulam beams. Unfortunately, the pictures might not be the best. The roof slope is gentler in reality. But the principles are correct. ;-)
At first, I was considering option 1. To notch out the rafters so they go down more on the side of the glulam beams. But not entirely.
The roof will be insulated. So the idea here was to leave a few centimeters above the beams for an air gap. And to place a beam under the rafters that is glued/screwed in place and on which they then rest.
This option was perhaps mostly for aesthetic reasons. That the eaves would then be slightly lower in relation to the glulam beam. And some unfathomable thought that it would be easier when the roof is insulated. The rafters are standard 170x45 beams.
I thought a bit more that it must still be easier to let the rafters rest on top of the glulam beams instead according to option 2. And just notch out a bit in the rafters so they lie flat on the glulam beam. The roof becomes marginally higher.
The option might be complemented with a beam that is glued/screwed to the glulam beams as extra support for the rafters like alt 1.
I've seen both options used. Is there anything structurally that can guide me to a decision...
Or is it just personal preference...
A principled response without knowing any details. If the construction is to be visible, it should be as simple as possible. One should always avoid notching beams too much. In a construction with a ridge beam, the shear forces at the ridge and side beams can become high, which requires a good amount of material in the roof beams. This altogether makes me prefer option 2.
A principled response without knowing any details. If the construction is to be visible, it should be as simple as possible. One should always avoid notching beams too much. In a construction with a ridge beam, the shear forces at the ridge and side beams can become high, requiring substantial material for the roof beams. Altogether, this makes me prefer option 2.
Yeah. Why complicate when you can make it simple. Simpler at least...
Thank you. You've got my thoughts back on track again.
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