Dimension of wall plate over doors

[Lizzardo]

I am planning my next build but I'm struggling a bit with what to use above the slightly larger openings....

The building is 22.8 x 11 m
The frame will be built with 195x45
Free-spanning roof trusses at cc 120
Metal roofing

2 openings at 30x30
1 opening at 25x23
1 opening at 16x23

Is it enough to glue and screw together 2 195 beams above, or do I need to use laminated beams?
And as a follow-up question, what do I need to support them with?

The drawings don't match exactly in terms of measurements, but they give a hint of how it will look.

Grateful for all the help

 

[justusandersson]

There will be quite substantial snow loads with a building that large. Above the three large openings in the long facade, you need to use glulam. Without an exact drawing showing the positions of the trusses, you have to consider the most unfavorable situations. I suggest the dimension 90x270 mm in all cases. The narrow door on the gable end should not have any roof loads if there is a truss above it. There, 45x195 timber will suffice.

 

[Lizzardo]

There will be quite substantial snow loads with such a large building. Over the three large openings in the long façade, you need to use glulam. Without an exact drawing showing the placement of the trusses, one must consider the most unfavorable situations. I suggest dimensions of 90x270 mm in all cases. The narrow door on the gable should not have any roof loads if there is a truss above it. 45x195 lumber will suffice there.

Thanks for the response, I had a feeling there would be some glulam involved.
90x270 fits, so that's not a problem.
I am thinking of a single long beam over the large doors since there's only 1m between them.
What do you think about the studs supporting the glulam, would it work with double screwed together on each side and the middle?

 

[justusandersson]

I don't know how you have planned the construction of the walls, but the important thing is that the studs are properly stiffened (with noggings) in the weak direction. With the loads in question, there should be noggings at 1200 mm intervals. If that's done, simple 45x195 studs (C 24) will suffice.

 

[Lizzardo]

I don't know how you have planned the construction of the walls, but the important thing is that the studs are properly stiffened (with noggings) in the weak direction. With the loads that are relevant, noggings should be placed at 1200 mm intervals. If that's done, then single 45x195 studs (C 24) will suffice.

I was thinking of a pretty basic construction.
Base plate, studs at 600 mm intervals, standing top plates and a lying one above, all in 45x195.
So it needs to be nogged at 1200 mm intervals in each section of the wall?

 

[justusandersson]

It is absolutely necessary. Each roof truss support has a load on the order of 20 kN, i.e., about 2000 kg, while the wall height is 3.5 m. One alternative is to use square posts, but that probably won't be cheaper.

 

[Lizzardo]

Ok, great.
Thank you so much for the help.