"Christian McArdle" wrote in message
...
It is under rafters with 25mm cross battening and plasterboard, as
recommended.

Is the loft vented?

The loft is habitable space and ventilated accordingly.

Are the eves vents left intact?

Above the insulation, from front to rear, there is soffit ventilation, 3
ridge vents supported by cross ventilation at the apex and then
ventilation
at the rear of the dormer to the soffit. There is at least 5cm to the
ventilation channels. In addition, the sarking is breathable membrane.

Christian.

So you installed breathable membrane under the tiles and have eves
ventilation that vents up the rafters following the roof slant to the ridge
tiles. I read that only breathable membrane is sufficient as long as the is
an air gap of 25mm; and no eves and ridge ventilation is required. The gaps
between the tiles is enough to take away the water vapour.