Shed/Summerhouse Roof

[Russ W2468]

All, I am building a five-sided corner Summerhouse, I have constructed the side frames out of 3x2 treated timber and have now moved onto the roof. I am a little stuck here and not sure if I am overthinking it too much. Basically I plan to put in 4 main rafters at raised angle of course but also need to add some 'Jack Rafters' I thin they're called to aid support of the roof panels at 45deg to the main rafters. The Summerhouse is only 2.2 metres across but I think that as well as cutting the Jack Rafters at 45deg I also need a compound angle cut to allow for the rise angle as it attaches to the main rafter as just a 45deg cut on it's own will not sit square. I suspect as well that the 45deg cut will not actually be exactly 45deg as the rise again alters that as well. I am also constructing the rafters out of 3x2 timber. I have a sliding compound mitre saw but can't figure out how to set it up and to what angles. Clearly one cut needs to be at 45deg but I have no idea what the compound angle would be or even whether I actually need to bother as the general size of the shed is too small. The 4 main rafters will not be positioned at the corners, but instead at the mid point of each side to allow for the cut-off fifth side.

 

[Notch7]

I think your set out may cause problems.

You need to fit hips, which sit on each corner and goes up to the back.



however I wonder if you may be better off just fixing a noggin between the hips - so on plan they will be like concentric “circles” - might give you better support for the roof sheet material.

 

[Russ W2468]

Ok, that makes sense, but don’t i still need to cut a compound angle or will it just be 45deg cuts at either end….?