In message , Harry Bloomfield
writes
It happens that Tim Lamb formulated :
Chalet bungalows often have wide soffits. Mine has 6mm ply slotted in
to the vent strip. I cut sections out between the joists for access
and screwed on an overlapped cover. With fresh paint it is not
noticeable.

Good point I had not thought of, an access point via the soffit. I will
pass that suggestion on..

Further to the above. We have dormer windows in several of the upstairs
rooms. I cut access doors in the internal *cheeks* and made insulated
cupboards.

--
Tim Lamb