Trays should exist on a cavity wall like this one appears to be . Not just over windows and doors .
Pointing around the railings won't help slot as the metal will expand and contract.
On the inner skin mitred corner is a cut brick joint vertically water could get in there .
Assuming , the grp roof is intact then the water will be going through the brickworks
Pointing around the railings won't help slot as the metal will expand and contract.
On the inner skin mitred corner is a cut brick joint vertically water could get in there .
Assuming , the grp roof is intact then the water will be going through the brickworks