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I'd like say a huge thanks to oldun and noseall for their valuable help. I got the roof done over the bank holiday weekend apart from the fascia and detailing around the rubber and the BCO came around today and passed it and declared it a "very good job". So thanks again for the great advice!

Oldun, is there any reason the insulation needs to be foil-faced for this? I've seen some Thermawall TW53 for £4 a sheet which would work out miles cheaper than the Celotex. Thanks

The email notifications were going in to my junk mail, so I didn't realise you'd replied. Thanks option 2 sounds like the way forward. I've got the bottom deck on and have already got the OSB for the top deck, so I am ready to order the insulation and fit that. I was hoping that I could...

Thanks oldun That was very clear and easy to follow. I am hoping to avoid buying TD4000 as it seems it is very expensive, and use XR4000 and OSB instead. Is that similar to method 2? I've put an 18mm deck of OSB down already. Thanks

It is the VCL bit I'm not sure about. It seems you can either use the helical nails (and therefore fix through the vcl) or bond everything, but I don't know what to bond it with.

Thanks again oldun I did the ladder as suggested The joists are 8" x 2" and span about 12 foot I've used firrings - max depth of these are 4"

I've not got the Celotex yet, but was think of getting xr4130 since it is cheaper. I am working off the "balconies and terraces" guide on the celotex website since I'm putting osb over the top, and that says to use xr4000 The roof area is about 30m2. Thanks

I've checked the Celotex website and they show me all the stuff I already know, but what I don't know is what adhesive to use to bond all the layers. I asked the suppliers of the adhesive I mentioned above and they said it was only for bonding insulation to a mechanically fixed bitumen vcl...

Has anyone got an opinion of this, or am I best getting the helical nails?

Thanks to noseall's advice I've built the structure and deck of my extension roof, and am now ready to add the insulation/EDPM From checking the forums PU adhesive seems the way to go. I've got a 18mm OSB deck and so am plannning polythenene VCL next, then 130mm Celotex, then 9mm OSB, then...

That's really helpful noseall thanks. So when you mean the last primary joist catches the plasterboard, does that mean the inside face of the joist lines up approx with the inside of the block skin? By my reckoning that makes the distance between the two joists on the end somewhere about...

Hello I'm hoping someone can help me with a couple of queries about flat roof construction. I've read a lot about how they are constructed and am confident I can manage it, but I can't see to get one thing straight in my mind. At the walls running parallel with the joists, where is the last...