Insulation between rafters

[scottfindlay]

I've read through some of the posts but I'm still unsure of what to do. I've just installed insulation in my rafters with the intention of plasterboarding over it, but I've been getting small puddles of water on the floor. I phoned up my local roofer to see if I had a leak in the roof, he has checked and said it's sound but when I showed him the loft he said that it's condensation and I need a 50mm gap between the roof and the installation for the air to flow.
The rafters are at 45deg therefore I've had to use netting to hold it in position and don't really want to redo it, can I make the gap between the insulation and the plasterboard giving me roof-installation-50mm gap-plasterboard or do I need to remove the installation to give me roof-50mm gap-installation-plasterboard
I've also asked my roofer to install more vents in the eaves to provide more air flow.

 

[freddiemercurystwin]

Is there felt under the tiles or not?

 

[scottfindlay]

Yes there's basic 1S roofing felt.

 

[freddiemercurystwin]

If you mean there is traditional felt membrane that is non breathable then yes you need a minimum 50mm ventilation gap between the underside of the felt and the top of the insulation. But the gap must be vented at the eaves and the ridge.

 

[scottfindlay]

Thanks for the advice, not the outcome I wanted but that's life. You learn by your mistakes.