Roofing

My new GRB roof is leaking only when the ice is melting

Anonymous user 23/02/2024 - 3.50 PM

I got a new pitched GRB roofing with lead flashing at the top. My roof is fine even in heavy rain but ONLY leaks when the ice on the roof melts away for some reason. The GRB roof has gof fibreglass resin topped with gray resin. If there is hole on the roof itself then I am sure it will leak even during rain but it doesn't. Since it only leaks when the ice melts away, I think there is ice under the lead that melts into the roof that causes the leaks. Wonder why would it be icy under the lead. There is a gap along GRB roofing and the wall at the top for ventilation and the covering on top. Question is where would the leak come from, would it be from the roof itself or the melting ice that gathered behind the lead or somewhere else? Greatly appreciate your help. Thank you