Box Gutter Framing Detail

Box gutters are deemed to satisfy the performance requirements of the national construction code if they are certified to meet.

Box gutter framing detail.

The shape of the box gutter is created by a skilled carpenter as the shape and. 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. 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. 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.

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. The details shown are for the lining of a wood box gutter frame. 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. Clearance for downspouts through the wood framing is a minimum 1 2 all around.

When lining a masonry cornice the edge strip can be secured to the masonry cornice with brass screws and lead shields 12 apart. On this page you can find the pdf instructions for installation of a typical box gutter detail with the dryseal flat roofing system.