Let me try to make this as simple as i can.
Box gutter construction.
Built in box gutters are meant to be part of the architecture.
A box gutter is actually built into the bottom of the roof or into the roof overhang.
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.
In classical design gutters were part of the architecture of a building.
A good box gutter design will have falls along its length together with sumps to collect water before it is fed into large downpipes.
Typically a box gutter is trapped between two roofs that feed rainwater into it.
A box gutter internal gutter parallel gutter or trough gutter is a rain gutter on a roof usually rectangular in shape.
The water is drained via downpipe nozzles or via a sumps downpipes built into it.
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