Box gutter

Box gutter, Parallel Gutter, Trough gutter A gutter on a roof usually rectangular in shape; may be lined with metal, asphalt, or roofing felt;may be concealed behind the eaves or in a valley.. 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. 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.

Provision is made in the design of the gutter to have a fall to the outlet with a minimum of 1:200 and a maximum of 1:400.

Gallery Of Sketches

Note! The sketches in this section reference terminology commonly used in the UK and Australia.

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  A section through a box gutter at the intersection of the bottom of a sloping roof and a parapet wall.
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  A simpler box gutter arrangement at a parapet wall that give a bare minimum of compliance to the Building Code of Australia (BCA)
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  A boxed gutter at a valley.
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  A sketch of a now illegal gutter construction under the BCA. A design to be avoided!

External links

• An Illustrated glossary of roofs and roofing terms.