# Box gutter

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> Source: https://en.wikipedia.org/wiki/Box_gutter
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A **box gutter**, **internal gutter**, **parallel gutter**, or **trough gutter** is a [rain gutter](/source/Rain_gutter) on a [roof](/source/Roof) usually [rectangular](/source/Rectangle) in shape; it may be lined with [EPDM rubber](/source/EPDM_rubber), metal, [asphalt](/source/Bitumen), or [roofing felt](/source/Roofing_felt), and may be concealed behind a [parapet](/source/Parapet) or the [eaves](/source/Eaves), or in a [roof valley](/source/Roof_valley).[1][2]

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 rain flow to the outlet with a maximum slope of 1:200 and a minimum of 1:400.

## Gallery of sketches

Note! The sketches in this section reference terminology commonly used in the UK and Australia.[2]

## References

1. Dictionary of Architecture & Construction, C.M.Harris.

1. Glossary of Australian Building Terms - Third Edition.(NCRB)

## External links

- [An Illustrated glossary of roofs and roofing terms.](https://web.archive.org/web/20121017003751/http://www.builderbill-diy-help.com/roof-glossary.html)

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Adapted from the Wikipedia article [Box gutter](https://en.wikipedia.org/wiki/Box_gutter) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Box_gutter?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.