Fitting Fascia Boards and finishing flat roof

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Hi,

I've got the roof joists in place now for my out-building and just wanted to check next step for fitting the Fascia Boards.

Am planning on putting 100m celotex / kingspan ontop of the joists, then OSB3 boards on top of the insulation then finish it with either fibreglass or rubber roof. I will nail the OSB3 thru Insulation thru to joists.


Had a couple of questions?

1. Should i fit the Fascia's directly to the Roof Joists?

2. Should i place the Insulation / OSB directly on and start at the edge of the roof? or do i need to build a timber frame to contain the insulation and boards inside?

3. Do i put the Facias on first or the Insulation / OSB3 boards?

4. Do i need to put in any vapour control layer membrane?

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