Box Gutter Framing

Fascia and beam cladding custom slanted back box rain gutters.

Box gutter framing. The bottom of the frame may be pitched to provide positive drainage to the downspout. 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 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. 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.

Copper gutter linings are most often built into wood framed supporting structures. Box gutters are also known as parallel gutters trough gutters or built in gutter systems. The lining must be free to move. 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.

Although the copper lining conforms closely to the gutter frame profile it should not fit tightly. Box gutters are composed of wood framing with a sheet metal lining normally copper stainless steel or galvanized steel. 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. 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.

The sheet metal creates a trough for the rain water to flow into the downspout. They are most commonly found in older historical homes or buildings. 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. Unlike other gutters they are part of the roof structure.