The bottom of the frame may be pitched to provide positive drainage to the downspout.
Box gutter framing.
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.
Box gutters are composed of wood framing with a sheet metal lining normally copper stainless steel or galvanized steel.
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.
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.
Box gutters are also known as parallel gutters trough gutters or built in gutter systems.
Although the copper lining conforms closely to the gutter frame profile it should not fit tightly.
Most box gutters consist of wood framing covered by a thin sheet metal lining made out of galvanized steel stainless steel copper or another metal that will not easily corrode.
They are most commonly found in older historical homes or buildings.
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A box gutter is actually built into the bottom of the roof or into the roof overhang.
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.
The lining must be free to move.
Unlike other gutters they are part of the roof structure.
A box gutter does not hang onto the edge of a roof or on the edge or side of a house as many modern pre formed metal gutters do.
Licensed sheet metal contractor call 323 405 4555 for estimates in la or oc.
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