On 20/04/18 09:26, Handsome Jack wrote:

When I insulated my new roof space I followed BC's instructions of
leaving a ventilation gap at the eaves (by not running the rockwool
right up to the edge). Now I'm getting birds roosting in the loft, and
leaving bird **** everywhere. Mind you it was just this last winter,
which was a pretty cold one.


You presumably didn't follow his advice on installing a grill or mesh?