Workshop on a slope 2

[ptomharper]

Hi all

I'm not sure if anyone remembers but I came here to ask for advice on my workshop on a slope. I had the ground levelled and ordered the 75m line pump for concrete. So glad I went for the slab over a timber floor construction as suggested.

Now looking to order materials, my next question comes with the roof construction. It will be a dual pitched roof spanning 4.8m. I want to insulate between the rafters so I get the full height inside, therefore I don't need any ceiling joists for a ceiling but is it still necessary to tie in the roof on every rafter or could I use 2 or 3 hefty ties (8x2's?) evenly spaced along the building to tie in the walls? I hope this makes sense. Any help is greatly appreciate!

P.s excuse the drawing

 

[fuse]

What are the walls made of?

 

[ptomharper]

What are the walls made of?

4x2 timber stud. OSB sheathing. Battens and larch cladding.

Thanks, Patrick

 

[Malc2098]

Somewhere in here, the forum, @Mike G describes a 'structural ridge' which does not require ties, I think.

I certainly used that design for my 'shop build. I dis put three ties in at each end, but used them for storage.

 

[Mike G]

........or could I use 2 or 3 hefty ties (8x2's?) evenly spaced along the building to tie in the walls? ...

Yes, so long as the wall plates are continuous, or are doubled with staggered joins.

 

[ptomharper]

Somewhere in here, the forum, @Mike G describes a 'structural ridge' which does not require ties, I think.

I certainly used that design for my 'shop build. I dis put three ties in at each end, but used them for storage.View attachment 54599

Just what I was thinking too. Would be some handy storage.

 

[ptomharper]

Yes, so long as the wall plates are continuous, or are doubled with staggered joins.

Great! Thanks Mike. Noted. Will keep the cost down for sure.

 

[Mike G]

Just what I was thinking too. Would be some handy storage.

If you are going to use your ties for storage, then you'll need to use 250 x 50s, or, 200x50 with hangers (from the ridge). If you don't intend loading the ties, you could use 10 or 12m steel rod, supported in the middle by something hanging from the ridge (usually more of the same rod). You'll need plates welded on the end to screw securely to the wall plates.

 

[ptomharper]

If you are going to use your ties for storage, then you'll need to use 250 x 50s, or, 200x50 with hangers (from the ridge).

250x50s fixed with bolts and square washers through the rafters?

How would hangers from the ridge work? On vertical timbers between the ridge and 200x50 tie?

 

[Mike G]

250x50s fixed with bolts and square washers through the rafters?

Yes.

How would hangers from the ridge work? On vertical timbers between the ridge and 200x50 tie?

You drop a vertical timber down from the side of the ridge to a joist, and you wrap some universal galv ms banding around the joist to connect the two. If it's more convenient, instead of having a hanger for each joist, you can run a 6x1 binder along between hangers, supporting 2 or 3 joists (again, on universal strapping). All parts of that arrangment are in tension, hence the straps.