Shed roof structure

[daggermark]

I'm currently designing a shed and have a question about how to structure the roof. I need to keep the height under 2.5m as it's close to a boundary.

The shed is 5' 6" x 11' and will be built out of 3x2. I was aiming for an apex roof with 6/12 slope. This would make the rise about 1' 5", plus the rafter and sheathing etc, so call it 1' 9". The slab is a couple of inch above ground. That leaves me a maximum of 6'3" from slab to eaves.

Ideally I'd avoid rafter ties as I would prefer the extra headroom, but I am conscious of the possibility of wall spread down the 11' length. I had toyed with the idea of a ridge beam to transfer load into the gable walls, but this would come down over the doors and give me another headache.

I am aware this is likely overkill for a shed but I'd rather do the job once and properly.

Any opinions on what to do? I believe it is acceptable to install rafter ties 1/3 up from the wall top plate, this could buy me an extra few inches headroom? Or lower the roof pitch to 5/12 and use the saving on the eaves height? Ignore rafter ties entirely because its just a shed?

 

[big-all]

keep in mind you only need head height where your head will go
in my shed i have "A" frames with the cross bit at 6ft3" and at the sides drops to perhaps 5ft6 on a 30% angle i am about 5ft 10ex 6ft lol

 

[daggermark]

Makes sense, thanks.

 

[big-all]

what cladding you planning on using ??

 

[daggermark]

For the walls? Featheredge probably.

 

[Mr Chibs]

What are you having for the roof covering?

You could build a scissor truss (Gives a vaulted appearance) for increased headroom.

Raised collar is probably the easiest to construct, think generally a third up is where you want to be.

 

[big-all]

i used txg shiplap built 2005 still looks new couple off coats ducks back every 5 or so years and its 100% dry
5" is cheaper than 6" by double the difference as in the extra inch adds the equivalent off say 33% -40%to the cost for only 20% extra coverage
and the actuall coverage is 109mm for 5 inch plus a 2mm gap =111mm so planed it for full planks including the 2.5-3" overhang at the bottom to protect the 18mm ply floor and the joist ends

 

[daggermark]

What are you having for the roof covering?

You could build a scissor truss (Gives a vaulted appearance) for increased headroom.

Raised collar is probably the easiest to construct, think generally a third up is where you want to be.

Roof covering will be 12mm osb or ply depending what the merchant has.

Think I'm going to go for the 1/3 raised tie, easy to build and should do the job.