Found water coming through the light fitting in our bedroom last night, so
the flat roof above will need re-felting, that I guess is inevitable however
I seem to remember when the extension was built that the builder half filled
the gap between the beams with insulation, like he rolled out the insulation
from underneath put it between the beams and then held it in position with
some lats half way up the beam, the question is does the space need an air
gap or should I take this opportunity to strip off the roof completely
install a load of insulation between the beams and then re do the roof ?