New question about alternatives to a load-bearing interior wall with posts and load beam instead

[Novisfixaren]

I am working on a garage project with a gable roof with a span of 7.5m, snow zone 1.5.

The basic idea was to have a load-bearing interior wall in the middle, so the span is 3.25m per section.

The studs in the load-bearing interior wall are 45x95mm cc 60 with a 45mm thick top plate on which the rafters rest.

If I now want to replace the load-bearing interior wall with posts at about 120cm instead without paneling, how much do I need to increase the dimension of the top plate then?

I have searched everywhere but can't find a table or explanation on how much the load-bearing capacity decreases if I increase the distance between the posts instead of the original classic interior wall with cc60?

I spontaneously think 95x95 posts with double nailed 45x145 on cc120. Will that work, or can I reduce the dimension further?

Ceiling height is an issue...

Very grateful for a response.

 

[justusandersson]

so the span is 3.25m per section.

Should be about 3.75 m?
There are some missing details to be able to calculate it properly. What do the roof trusses look like? What will the loft be used for etc. Normally, double glued 45x95 beams should suffice. Note that freestanding pillars must be dimensioned considering the risk of buckling.

 

[Novisfixaren]

Should be about 3.75 m? There are some missing details to be able to calculate it properly. What do the roof trusses look like? What will the loft be used for etc. Normally, double screwed and glued 45x95 should suffice. Note that free-standing posts must be dimensioned with consideration for the risk of buckling.

My mistake, of course, 3.75m.

There is no loft; I was apparently very sloppy. It's a mono-pitched roof. Please see my post here for what I am trying to build: https://www.byggahus.se/forum/threa...ring-konstruktionsvirke-till-baerlina.391630/

Very grateful if you could take a look at it.

 

[Toffelhjälten]

You can download the quick guide in the play store.
A free app from svenskt trä.
There you can dimension things.

 

[Novisfixaren]

You can download the guide in the play store.
A free app from svenskt trä.
There you can size things.

There's not really a dimension for a load-bearing beam in a load-bearing internal wall included.

 

[justusandersson]

Isn't it okay to place the rafters at c/c 1200 mm?

 

[Novisfixaren]

What is the advantage of placing the roof beams at cc 120?

If I place them at cc 120, do I need to increase the size of the roof beams, and does it eat up ceiling height?

 

[justusandersson]

What dimensions have you considered?

 

[Novisfixaren]

What dimensions have you considered?

I was thinking of using rafters 45x145 C24 and a central beam/load-bearing beam/main beam with 2 glued vertical 45x145s with posts at cc 120. I would have liked to be able to roll pallets between the posts though, so it needs to be about 130 between the posts.

Your idea of placing the rafters directly on the posts at cc 120 is good in one way, but it's not flexible if you want to move a post for some reason, perhaps?

 

[Peter1986]

https://www.byggbeskrivningar.se/dimensionering/nockbalkar-och-takasar/

 

[Novisfixaren]

[link]

But there is no possibility to calculate on a central beam under a shed roof?

 

[Peter1986]

But is there no way to calculate a center beam under a mono-pitched roof?

oops, wrong
https://www.byggbeskrivningar.se/dimensionering/pulpettaksbalkar-och-balkar/

 

[Novisfixaren]

For example, it might possibly turn out like this.
Will 2 screw-glued 45x145 relative to a 45x170 be equally strong or stronger?

 

[justusandersson]

45x145 C 24 with a span of 3.75 meters in snow zone 1.5 is a bit undersized. With c/c 600 mm, 45x220 is needed according to my quick check. You can place double screw-glued 45x220 on c/c1200 mm (or 1300 mm) with the same result.

 

[Novisfixaren]

45x145 C 24 with a span of 3.75 m in snow zone 1.5 is on the flimsy side. With c/c 600 mm, 45x220 is needed according to my quick check. You can use double screw-glued 45x220 on c/c1200 mm (or 1300 mm) with the same result.

Ok, so you think the calculation according to the picture is a bit weak, do I interpret you correctly then?

My problem is that the ceiling height at the edge of the shed roof becomes extremely low, which is my problem.

You mean that 2 screw-glued roof beams 45x220 C24 directly on posts on cc 130 would work? (Without a load-bearing beam)