Floor structure - Dimensioning

[mölnbo]

Hello!

I want to raise the attic floor to achieve higher ceiling height in a room during renovation.

Can anyone help me with a calculation of how the floor should be constructed? Is it possible to answer this or is more information needed?

The sketch shows how the current floor is constructed. I'm also sending some photos of how it looks.



The house is located in snow load zone 2.0. It has a sheet metal roof.

I hired a designer. Before he was on sick leave, he wrote the following:
Sk=2.0 kN/m2
Wk=0.56 kN/m2 (Terrain type III + Vk=24 m/s)
qk=2.5 kN/m2 (Category A + interior walls)
Standards: EKS11 with associated Eurocode

The roof consists of roof beams “logs” 100x100s1200 resting on a ridge beam 150x180. The material is timber. The ridge beam rests on a new beam crossing the collar ties. Roof beams have side supports on both the beam and the house's facade.

Help?

 

[justusandersson]

I suspect that it is not possible to move the floor beams without jeopardizing the stability of the timber frame. How much do you want to raise the ceiling? The constructor's figures only mean that he has calculated characteristic values for snow, wind, and so-called useful load.

 

[Silver78]

Can you imagine a solution where you leave the gables intact two beams in?

 

[mölnbo]

Can you imagine a solution where you leave the gables intact two beams in?

I'm not sure what you mean. I can imagine most solutions, as long as they are approved by the municipality and we get a higher ceiling height.

 

[mölnbo]

I suspect that it is not possible to move the floor joists without compromising the stability of the timber frame. How much do you want to raise the ceiling? The constructor's figures only mean that he has calculated characteristic values for snow, wind, and so-called useful load.

I would need to raise it about 20 cm.

There is a log at the outer end near the wall. If I place the floor structure on top of it, I imagine that the timber frame will remain stable.

 

[mölnbo]

I would need to raise it about 20 cm.

There is a beam at the very end near the wall. If I place the joist on top of it, I imagine that the timber frame remains stable. Attaching sketch

 

[Silver78]

I am unsure what you mean. I can consider most solutions, as long as it is approved by the municipality and we get a higher ceiling height.

In a house, it's the corners and gables that are often the most sensitive in a construction. There is also some sliding impact in the middle. Do you have a picture where you can see a bit more of everything in the attic?

 

[justusandersson]

Can you show an image of how the floor joists are attached to the exterior walls?

 

[petterovski]

The beams appear to be joined to the wall with some type of timber joint.

I don't see any direct issues with raising the attic floor. The challenge lies in connecting the new floor joists to the exterior walls in such a way that the stability of the timber wall is not affected when the existing floor is removed.

Is the attic floor suspended from the glulam beam seen in the picture? That beam can preferably remain, with the new floor being placed on top of it instead. How high is the glulam beam?

 

[petterovski]

I don't think that the floor structure needs to be designed for a live load of 2.5 kN/m2. The attic isn't going to be furnished, as I interpret it? The characteristic live load for an attic floor structure is 0.5-1.0 kN/m2 depending on the clear height.