Hi, I’ve recently moved and there’s a long term issue with one of the roof valleys on the house I’ve bought - water marks on the wall indicate that it’s been going on for a long time. The valley is made of rigid plastic membrane, the edge protrudes over the gutter about 2cm, is at an angle of about 35 degrees. Water runs down the gutter but some water runs under instead of dripping into the gutter and then goes onto the soffit and drips and runs down the wall.
Any ideas of how to stop the water from running back under the edge of the valley membrane and onto the soffit.
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