When this property was constructed the builders left the under felt short in numerous places. They also failed to install cement fillet boards at the short verges. This has led to water being delivered onto the top of the external walls & down into the cavity. At some point damp proof course ( DPC ) has been slipped under the tiles/under felt to try & resolve the damp problems inside. Unfortunately that collapsed being flimsy by nature. We have installed eaves support drip trays, which are rigid, then we carried out repairs to the under felt using breathable membrane. We have also installed fillet boards at the short verges to give protection to the brickwork.