Hi, i have a flat roof garage linking between my house and the neighbouring house, i want to convert the garage to a room and replace the flat roof with a pitched. The building inspector has said about cavity trays where the new pitched roof will meet the existing external walls, does this mean on the neighbours external wall too? How does that work? can the builder just flash up the side of the wall and not penetrate the neighbours wall at all?
thanks for any help that might come my way...
thanks for any help that might come my way...