Replace 245 x 45 with 220 x 45

[virenoverarvilla]

The question is, can you replace 245 x 45 C24 cc 1200 with 220 x 45 C24 cc 600 in a roof truss? It rests on 2 ridge beams 315 x 115 glulam which are supported by columns 115 x 115 glulam.

 

[justusandersson]

You probably need to describe the situation a little more accurately for it to be understandable. Nockbalk is the same thing as a ridge beam. Do you mean rafters in the direction of the roof slope that rest on the ridge beam? In that case, roof pitch and snow zone are important pieces of information.

 

[virenoverarvilla]

You probably need to describe the situation a bit more thoroughly for it to be understandable. "Nockbalk" is the same as a ridge beam. Do you mean rafters in the roof slope direction resting on the ridge beam? In that case, roof pitch and snow zone are important details.

You probably need to describe the situation a bit more thoroughly for it to be understandable. "Nockbalk" is the same as a ridge beam. Do you mean rafters in the roof slope direction resting on the ridge beam? In that case, roof pitch and snow zone are important details.

You probably need to describe the situation a bit more thoroughly for it to be understandable. "Nockbalk" is the same as a ridge beam. Do you mean rafters in the roof slope direction resting on the ridge beam? In that case, roof pitch and snow zone are important details.

Have used the dimensioning program which refers to it as ridge beam, so I used the same term. But yes, I mean rafters. Roof pitch is 27 degrees and snow zone is 2.5.

I can upload the dimensioning.

Otherwise, maybe one can screw-glue two pieces of 220 x 45 together to get sufficient bearing capacity as a 245 x 45? But it would be better with a single 220 x 45 at cc 60 for the insulation.

 

[justusandersson]

Transverse roof beams is stated, which is a bit clearer. However, it is still an incorrect term. A beam is always longitudinal. Remarkable that Svenskt Trä is so bad at Swedish! Without having reviewed the calculations, I can say that it should be possible to replace 45x245 c/c 1200 with 45x220 c/c 600.