The foundation of most box gutters is wood that is then covered with thin sheet metal such as tin copper lead stainless steel or some other metal that will not readily corrode.
Box gutter construction.
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It may be lined with epdm rubber metal asphalt or roofing felt and may be concealed behind a parapet or the eaves or in a roof valley.
A box gutter is actually built into the bottom of the roof or into the roof overhang.
A box gutter internal gutter parallel gutter or trough gutter is a rain gutter on a roof usually rectangular in shape.
Built in box gutters are meant to be part of the architecture.
Box gutters are essentially placed between parallel surfaces as in a valley between parallel roofs or at the junction of a roof and a parapet wall.
In classical design gutters were part of the architecture of a building.
Built in gutters are part of the classical orders of design.
The water is drained via downpipe nozzles or via a sumps downpipes built into it.