Choosing C grade wood for exterior walls

[Tomture61]

I'm going to build a garage and have some questions about the exterior walls.
Can I use C14 45 x 70 timber for the exterior walls (load-bearing part)

Bottom plate: 195 x 45. Viewed from the outside: Vertical studs: 45 x 70 x 2 pcs (with 10 mm insulation in between) horizontal on the inside: 45 x 45

I want this construction to reduce thermal bridges.

 

[larsbj]

Actually, there's too little information to answer, but generally, you could say that 45x70 is too weak.

Instead, use 2 pieces of 45x70 and build with 45x95+45x45 should give an equivalent insulation effect.

 

[Tomture61]

Read on Beijer's website that their 45 x 70 C14-2 can be used for construction of load-bearing walls.

 

[larsbj]

One option could be to join the two 45x70 so that they work together, for example with nails/screws, this might require a slightly harder cellplast.

 

[larsbj]

I read on Beijer's website that their 45 x 70 C14-2 can be used for construction of load-bearing walls.

Of course they can, but it depends on the load the wall is supposed to bear. An interior wall that supports part of an upper floor might work, but probably not when it has to bear the roof and snow load.

 

[Tomture61]

Sorry, they refer to it as G4-2
https://www.beijerbygg.se/store/pri...egel-45x70mm-1411972939228-46?artikel=454502#

 

[larsbj]

Sorry, they refer to it as G4-2
[link]

G4-2 is not classified for strength.

 

[justusandersson]

When it comes to the load-bearing capacity of posts (regardless of class), the so-called buckling length is the most important parameter. The buckling length is simply expressed as the post's free length, such as between bracing members. In the Wood Guide, an excellent tool by Svenskt Trä available online, you can see that a 45x70 C 14 post can withstand a centric compressive force of 18 kN if the buckling length in the x-direction (45 mm direction) is 0.8 meters but only 3.5 kN if the buckling length is 2 meters. 1 kN (kilonewton) is about 100 kg. Therefore, it is possible to use 45x70 posts as long as the structure is designed correctly.

 

[ghoti]

Sundsvall does not have the country's mildest snow zones. What should the roof span be?

 

[Tomture61]

5 x 8 meters, will be 95 x 45 C24 + 45x45 reglar instead