"Guy King" wrote in message
...
The message
from Mike Halmarack ... contains these words:

occurs naturally up there via the eaves but I do know that with an
airbrick in each opposing gable wall, there's a pretty constant and
very noticeable breeze. Do you notice much air movement if you stick
your head above the parapet?

Ask the insulation contractor not to push the insulation up to the back of
the felt underlay, leave a 25mm gap from the felt. If the insulation is
pushed up to the felt underlay, the alternative is to fit vent tiles above
the height of the insulation every 1.6 metres both eaves to cause an air
cross flow. There are GRP vent tiles to fit all concrete Marley, Sandtoft,
Redland and Russell tiles, both plain and interlocking. Just take out the
tile cut the underlay, fold back or inwards and replace the tile with a vent
tile.

K,S Notts