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The importance of rainwater drainage for your industrial flat roof

With the UK seeing an average yearly rainfall of 750mm, any roof: both domestic slanted roofing and industrial flat roofing, needs to be properly equipped with adequate drainage, guttering and downpipes. The drainage also needs to receive ongoing, regular maintenance.

Adequate drainage is necessary in preventing water damage which can cause havoc upon a building, especially upon flat roofing that gives water very little direction in which to travel once it lands. Flat roofs are also susceptible to ponding, which can lead to detrimental problems for the entire building, not just the roof. Because of their flat shape, they also require much different drainage solutions compared to other sloped roofing shapes. 

What drainage options are available for flat roofs?

Flat roofs are required to keep large-scale industrial buildings economical. These flat roofs require specific drainage requirements to ensure that rainwater is properly moved and not left to pool. Some of the most effective drainage options include:

  • Internal Drains

An internal drainage system is constructed of a pipe system hidden underneath the roof itself with drains positioned in specific areas. The roof is constructed to direct the water to these drains which is then transported directly to the sewer through the internal pipework.

Internal drains don’t require any gutters or downspouts, can be installed with a custom filter to prevent clogging and are able to be installed in useful positions specific to the building’s construction.

  • Scuppers

For railed rooftops a drainage system known as scuppers are used to drain off rainwater. Scuppers are essentially small openings around the perimeter of the parapet walls that move rainwater into a gutter or downspout.

  • Gutters and Downspouts

The most readily available drainage system is the simple combination of gutters and downspouts. For these to work on an industrial flat roof however, you need to have your roof constructed to contain adequate slope in the right directions for the water to find its way to the guttering without ponding in the centre of the roof. This type of drainage also needs regular checks to ensure that they don’t become clogged by leaves and other debris.

For more information on industrial roofing in Manchester as well as drainage options. Speak to a member of the Valent roofing team today.  


Valent Roofing, 500 King’s Rd, Stretford, Manchester, M32 8JT
Telephone: 0161 864 3311
Fax: 0161 864 3322

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