Graphical Construction Glossary >> Roofs and roofing. >> Roof Features >> box gutter
B-gutters although they look flat should have a fall to the outlet with a minimum of 1:200 and a maximum of 1:400.
They should be well supported on gutter boards or be of a sufficiently stiff material to span the framing members to allow foot traffic.
It is critical that the the gutter and outlets are designed with a sufficient capacity.
Unlike valley gutters between sloping roofs they have little fall and so they should be made a lot larger to be able to cope with the amount of water expected.
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