install a new larger window, glulam beam?

[Lane]

We are going to install a window 120 cm high and 240 cm long. The wall consists of 95 studs, cc 60 and 1 m between the rafters. The window will therefore be able to fit under two rafters. We assume that we need to support these with a glulam beam.

What dimension of beam will definitely do the job?

Does it matter where in the construction the beam is placed? We are considering placing it instead of the top horizontal stud in the frame and then just having regular studs around the window. The entire façade is going to be replaced and opened up.

Do we need to reinforce the vertical studs on which the beam will rest?

Is there anything else we need to consider?

 

[f91jsw]

It depends on how much load is above. Single-story house? Roof construction? But given that it's 95 studs at 60 cm centers supporting the current wall, it probably isn't an extreme load. In our single-story extension, we have a 240 window with a laminated beam 56x225 (which supports a roof truss since we have 120 cm centers for the roof trusses). This rests on simple but panel-stabilized 145 studs. I would probably at least double your 95s at the supports.

 

[Lane]

Single-story house, quite small.
6 m wide, slight roof pitch, (33 degrees I think), tile roof.

We are going to add extra insulation with a 95a, so we should be able to replace the load-bearing studs if that's a better option. But then the risk of a thermal bridge increases as the new stud will be horizontal.

 

[Lane]

If someone googles this thread, I can say that Moelven has a dimensioning program on their website, you can even print a report stating that if you've entered the correct measurements, they guarantee the strength. The smallest dimension was exactly what you had, 56x226, and it needed to rest on a 70 mm surface.