Roof trusses for shed

[Spannen]

Hello!
I'm building a storage (Project Thread) and am currently working on planning the frame but have hit a snag with the roof structure.

Facts:

• Gable roof
• Pitch: 27 degrees
• Building length: 5900mm
• Span: 3200mm
• Support: timber frame in 45x95
• Rafters CC 1200mm (resting on the vertical wall studs)
• Roof covering: Rough board, battens, sheet metal.

I would like to create a bit of extra ceiling height to hang things like roof boxes and a kayak from the ceiling. Therefore, I would love to have "A-trusses". However, I haven't managed to find any calculation programs or dimensioning tables for these.

Below is a sketch of my intended construction.

• Top chord: 45x145 C24
• Bottom chord/tie beam and support: 45x120 C24
• Bottom chord raised 250mm
• Joined with nail plates and anchor nails
• Notched at the support against the timber frame

I'm not expecting any definitive answers, but would appreciate a feasibility assessment on whether it seems reasonable or will never work. Suggestions for changes are also welcome!

 

[Matti_75]

It will hold.
If a lot of snow comes one winter, then it's just a matter of shoveling if it exceeds 1m.

 

[Spannen]

It will hold.
If there were to be lots of snow one winter, you just need to shovel if it exceeds 1m.

Thanks for the reply! Yes, that's true, though (unfortunately) I think we can only dream of 1m of snow down here

 

[fribygg]

If you need a building permit for your shed construction, it's perhaps best to order factory-made roof trusses, as the manufacturer will design and calculate the truss, leaving the building department no reason to question the structural integrity.

 

[Spannen]

If you need a building permit for your shed construction, it is probably best to order factory-made trusses. The manufacturer will calculate and draw the truss, and the building committee has no reason to question its structural integrity.

No building permit is needed. I initially considered ordering trusses, but I was foolishly late, and everyone is on vacation now, so it seems delivery won't be possible until after week 35 To meet my plan of at least having the frame ready during vacation, I'll have to build them myself.

I've now received some feedback from various sources (carpenters, building suppliers, etc.) who are all saying roughly what Matti said. I'll go with the plan as outlined above and see what happens!