Today, I have mansard trusses and plan to build an extension on the upper floor at an angle in the middle. Supporting the trusses would incur high costs and significant intervention, so I plan to leave them largely intact. However, I would like to cut down the eaves according to the dashed line (the image is not to scale with my truss, just the principle) and plan to reinforce by screw-gluing plywood on both sides according to the orange marking.
The truss rests on the outer wall between the eave and post in principle according to the arrow.
Could this work? I assume no truss manufacturer would want to calculate something like this as it no longer consists of triangles...
Only my load calculation brain that raises a red flag as the ridge beam takes a large tensile load from the sagging of the roof and the described modification would mean a great risk of buckling at both the upper and lower fastenings of the plywood board. A load which in the original design is absorbed by the lower part of the rafter without stressing a fastening point, but which now is distributed over two fastening points.
In any case, I'm just guessing that it's a problem, but it doesn't have to be; I would probably ask a constructor.
Click here to reply
Vi vill skicka notiser för ämnen du bevakar och händelser som berör dig.
