The sheet metal creates a trough for the rain water to flow into the downspout.
Box gutter framing.
Provision is made in the design of the gutter to have a rain flow to the outlet with a maximum slope of 1 200 and a minimum of 1 400.
They are most commonly found in older historical homes or buildings.
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Box gutters are also known as parallel gutters trough gutters or built in gutter systems.
Box gutters are composed of wood framing with a sheet metal lining normally copper stainless steel or galvanized steel.
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.
The lining must be free to move.
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The box is built by an experienced carpenter into the roof overhang or into the bottom of the roof then lined with the sheet metal.
They should not be confused with so called valley gutters or valley flashings which occur at the non parallel intersection of roof surfaces typically at right angled internal corners of pitched roofs.
Unlike other gutters they are part of the roof structure.
Fascia and beam cladding custom slanted back box rain gutters.
Copper gutter linings are most often built into wood framed supporting structures.
The bottom of the frame may be pitched to provide positive drainage to the downspout.
A box gutter is actually built into the bottom of the roof or into the roof overhang.
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.