Possible to switch over on gable 1.5 stories?

[Niklaspe]

Considering expanding the house to get a large kitchen. But is it possible to span a distance of 3.5 - 4m on the gable of this house without getting a pillar in between? marked in red as I thought to open up.

It is a roof truss that needs to be supported. Snow zone 3. 38-degree roof pitch, light metal roof without insulation or sheathing, just membrane. Built in 75.

How can you calculate the size of the glulam beam and pillar?

 

[larsbj]

There are no problems.
What needs to be done depends a bit on whether it is the same type of roof truss on the gable end as the others.
If it is, then it is really only the wall above that needs to be supported.

If it is not, then there will be a bit more load.

 

[Niklaspe]

It's no problem. What needs to be done depends a bit on whether there is a similar truss at the very end of the gable as elsewhere. If there is, then it is really only the wall above that needs to be reinforced.

If it is not, then there will be a bit more load.

From what I can see from the attic, the outermost truss is the same as all the others and rests on the top plate of the outer wall. Could it be that there are posts/struts between the windows in the red-marked box? If so, how do you know what type of glulam beam I need to install above the windows/new opening?

 

[larsbj]

In theory, it shouldn't be necessary, but it depends on how well the posts are read into the trusses. Put two 45x220 c24 next to each other and it will hold. These can be set up in the wall if you want to get a smooth ceiling inside against the old one. The first truss of the extension will also come against the wall, so you can screw it there properly.

 

[Niklaspe]

Yes, okay, sounds promising. However, I'm wondering how you mean that I should fit these two 45x220 since the wall plate is in the way? I'm thinking that the floor joists rest on the entire floor walls. Or am I thinking incorrectly?

It will be a ridge roof which I also, of course, need to attach to the existing wall in some way.

 

[larsbj]

Yes, okay, sounds promising. However, I'm wondering how you mean that I should fit these two 45x220 as the top plate is in the way? I'm thinking that the intermediate floor rests on the entire floor walls. Or am I thinking wrong?

It will be a cathedral ceiling which, of course, I also need to fasten to the existing wall in some way.

If it's going to be a cathedral ceiling, then it's a completely different thing, as it will require a quite heavy laminated beam.

 

[larsbj]

How big will the expansion be?

 

[Niklaspe]

How large will the extension be?

4.5 width - 3.5 depth externally, 16-degree roof pitch, approximately limited by the window on the upper floor.

 

[larsbj]

The ridge beam will probably be 90x315. The bearing beam is likely somewhat thicker, can check later in the week when I'm in the right place.

 

[Niklaspe]

Sure, the roof angle will be 16 degrees with these measurements.

How can I reduce the beam size 115x495 since that's the side I'm supposed to dock against the house and then open up? I prefer not to have pillars as that would defeat the purpose.

 

[larsbj]

Surely the roof angle becomes 16 degrees with these measurements?

How can I reduce the beam size115x495 since it's that side I need to dock to the house and then open up. Preferably, I don't want columns as it defeats the concept.

Have you calculated it in a program?

One alternative is to switch to a steel beam HEB.

But actually, you can just place the glulam beam higher up, so the height doesn't matter.

 

[Niklaspe]

Yes, exactly, I'm also thinking of placing it inside the longitudinal beams and placing a pillar at each corner to transfer the load off the gable beam. However, the question is if I can place the pillars on the joists, it would have been simple.

The longitudinal sides and the other gable will just be spanned walls, like 45x195.

 

[larsbj]

Exactly, I also think that you can place it inside the longitudinal beams and put a column in each corner to transfer the gable beam, but the question is whether I can place the columns on the joists, it would have been simple.

The longitudinal sides and the other gable will just be spanned walls cc600 type 45x195

Shouldn't the columns reach down to the foundation? Or what type of foundation should it be?

 

[Niklaspe]

I was thinking of making a closed/ventilated foundation, the slope is good. In the worst case, I'll have to place the pillars on concrete posts.

 

[Niklaspe]

Do you think it would work with a 2m internal wall at the lowest point, with the outer wall height being 2200?
Maximum ridge height 3200?

7000 wide and 3700 deep.

This is to avoid changing the windows on the upper floor.

There will only be one window on each side, and on the gable, a patio door and three windows.

What would be the angle for a scissor truss?