Rain gutter
The word 'gutter' originates from the Latin 'gutta' meaning 'a drop' which developed to mean a groove cut into something, or a furrow made by running water.
A rain gutter, also known simply as a gutter or guttering, is part of a building’s water discharge system. It is a trough or channel that runs around the perimeter of a roof, and collects rainwater runoff from the roof, discharging it, usually to rainwater downpipes which convey it to a drainage system. This protects the exterior surfaces of the building and its foundations from damp and potentially suffering damage.
The Building Regulation’s Part H, Drainage and water disposal, requires that adequate provision is made for rainwater to be carried from the roof of buildings. Approved document H suggests that to achieve this, roofs should be designed with a suitable fall towards either a surface water collection channel or gutter that surface water to vertical rainwater downpipes, which in turn connect the discharge to the drainage system.
The size of guttering can be determined from the area of the roof (metres) and the anticipated rainfall intensity (litres/sec/sq. m - the amount of water likely in a 2-minute rainstorm). There are a number of calculators that can be used to size gutters and rainwater downpipes based on this information.
Commonly used gutter designs include:
- Box gutters: These are rectangular and ‘boxed’ into the roof so as not to be visible.
- Fascia (or eaves) gutters: The gutter and fascia are combined so that the gutter appears to be build in to the eaves.
- Square gutters: Typically fixed to the outside face of the fascia, square-shaped and preferable in areas of heavy rainfall.
- Round gutters: Typically fixed to the outside face of the fascia, and half-circle-shaped.
- Quad (or ‘D’) gutters: Typically fixed to the outside face of the fascia, they are available in a range of different widths and profiles.
Traditionally, guttering was made out of lead, which was largely replaced from the late-18th century on by cast iron. This enabled gutters to be mass produced. Conservation projects will still specify cast iron gutters for restoration but these can also be replaced with cast aluminium.
Domestic guttering is typically made from uPVC sections, which are easily installed, cost-efficient and lightweight. They require minimal maintenance, apart from ensuring they do not become blocked, and have a good life expectancy. Standard components are available to allow them to be fixed, as well as corner section, connections for downpipes, and so on.
Gutters may also be made from materials such as aluminium alloy, galvanised steel, stainless steel, copper, zinc, and so on.
[edit] Related articles on Designing Buildings
- All eyes up to plastic rainwater systems.
- Approved Document H.
- Correct way to fix lead guttering.
- Difference between drains and sewers.
- Drainage.
- Drains.
- Fascia.
- Groundwater control in urban areas.
- Rainwater.
- Rainwater downpipe.
- Rainwater goods.
- Rainwater harvesting.
- Rainwater head.
- Rhone.
- Roofing defects.
- Sanitary pipework.
- Secret gutter.
- Sewer construction.
- Soakaway.
- Soil vent pipe.
Featured articles and news
A sun, tide, mass or scratch dial.
A brief description of time in the sun.
ICE Trustee Board update June 2022
Given by ICE President Ed McCann.
Artificial intelligence and project management
Two new research reports published by APM.
Association for Project Management membership offer
50% off APM Associate membership for Designing Buildings users.
Building safety, a shifting landscape for professionals
A commentary from the insurance perspective.
In brief with further links.
Walter Segal: self-built architect
A definitive book on a pioneer of green architecture.
Funding for heritage on the high street
Using heritage as a catalyst for reviving historic centres.
Commonwealth Heads of Government Meeting update.
Declaration prioritising sustainable urbanisation adopted.
A small hidden, often distant but key building component.
Some brief words about the actuator.
CIAT Chief Executive steps down.
After 34 years at the Institute.
Volunteer opportunity launched by the ICE
To support the next generation of engineers.
Provisional findings show illegal cartels in the industry.
CIAT reporting from the Competition and Markets Authority.
Making sustainable construction number one priority.
The future of construction report.
Interview with ECA CEO.
Many provisions came into force on June 28, 2022.
With room to expand.
An information packed session at the BSRIA conference.
Refurbishment, Energy Efficiency, Indoor air and process.
Create a profile, write informed product articles and share.
Aluminium Composite Panels (ACP) is one example.
We are indeed now 10 years old, so go on and be bold !
Write about something you know, help us build and grow !