First and last joist position (flat roof)

[nordita]

I've got a single skin building, wall plate is on and it will have a cold roof.

Where do I position the first joist and the last joist? E.g. How do I create an overhang for drips on the side but also have a place to stick the edge of the ceiling plasterboard?

Front and rear overhang is covered due to my joist length.

 

[23vc]

You use noggins from the last joist which is just before the internal face of the wall, to support a “flying” rafter according to whatever overhang you want. Google garden room or flat roof overhang noggins or something, should be loads of pics

 

[noseall]

I've got a single skin building, wall plate is on and it will have a cold roof.

Where do I position the first joist and the last joist? E.g. How do I create an overhang for drips on the side but also have a place to stick the edge of the ceiling plasterboard?

Front and rear overhang is covered due to my joist length.

It helps (fixing wise) to have a full depth joist fixed into the roof joist ends. The end joist can be left long enough to collect the flying overhanging joist. Supplement it with nogg's.

 

[nordita]

You mean something like this?

 

[noseall]

You mean something like this?

Correct.