How to replace larger windows

[Wasssp]

Hello!
I am in the process of replacing a window in the house with a larger one.
I was thinking of making a reinforcement above the window, but what material is suitable to use?
For the sides as pillars, I was thinking of using 120x45, but for the horizontal part, I'm not sure. Would two or three 120x45 beams standing upright work? I feel like as it is now, the beams have settled, so I want to do something better.

Any tips are welcome =)

This is an Älvsbyhus from the 60s, a single-story with a sheet metal roof in snow zone 3, with a 14-degree pitch on the roof.

 

[jonaserik]

Almost looks like there is a belly on the covering if the eyes aren't being deceived by the photo, you now have a ridge beam that the rafters rest on, what are the measurements for that?

 

[Wasssp]

It is 120x45 horizontal 3 pcs.

Yes, I agree, that's why I want to make something more stable now that I'm changing the windows anyway.

 

[jonaserik]

There is a joint on the top rail, but since there are 3 of them, the joint doesn't matter. Have you placed a straight board or level on it to see if there is a bulge? Then it should show if I'm seeing correctly, a bulge downward in the middle.

 

[Wasssp]

Yes, I think it's a small belly too.

 

[jonaserik]

Now you touched on a rule where the window should go, I was thinking more about the strong one at the top that the rafters rest on and it's the one that supports and looks like a beam.

 

[Huddingebo]

If it is a load-bearing long side, I would have put a 195 or 220 beam over the entire window.

 

[Wasssp]

Yes, it is a load-bearing long side, standing 220 with columns on the side?

 

[Wasssp]

It was difficult to get a picture, but yes, I think it's a small belly too. However, there is a seam there as well.

 

[Janus82]

Enter the dimensions of the house and window into Svenskt Trä's dimensioning program to get suggestions on suitable beams and how they should be supported. https://www.byggbeskrivningar.se/dimensionering

 

[jonaserik]

It was difficult to get a picture, but yes, it's a small belly I think too. However, there's a seam there as well.

Doesn't look like the top is getting any support from the underside, can you see if it's just resting on posts to the right and left of your opening?

 

[Wasssp]

I must thank you for all your comments; now I have installed the window with a reinforcement above. However, it started snowing now, so the construction is on hold for a while. It's a bit chilly without insulation; do you have any tips, like foam sealant or that kind of window insulation that you can buy? Here is a picture from last night, now there's a tarp over it. A few noggings and an additional beam need to be installed underneath later.