What Is A Roof Alley A roof valley is basically a gutter set between two
meeting pitched roofs. Depending on the roof area it serves, the valley is
the exit point for a large volume of water so extreme care should be taken
with installation. If the roof has been leaking for a while or if there are
any signs of rot, you will need to start by replacing the valley boards.
Lead sheet is not self supporting and should be placed on treated roofing
boards of sufficient strength to hold a large person. (Most roofing
contractors are big guys!) Fit boards of sufficient width to accommodate
the lead plus 100mm either side. This will give you something to nail the
roofing batons to.
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