Metal Gutter Manufacturers Association (MGMA)

MGMA seeks to encourage best practice in the specification and installation of metal gutter systems and produces a variety of documents designed to educate specifiers, contractors and home owners about the type of metal gutter systems available, their application, superior life expectancy and unrivalled value over other material alternatives.

In addition, the MGMA has developed a product matrix on the web site to help simplify the metal gutter specification process. The matrix is designed to help specifiers quickly find a suitable manufacturer for their next project; users can select from ten different material types, including fabricated steel, cast iron, cast aluminium etc. There is also an option to select from product application type namely, non-domestic, domestic, heritage, new build and refurbishment.

MGMA has developed a new best practice British Standard for the design and manufacture of metal gutter systems. The new standard specifies the requirements for the design and manufacture of metal gutters on industrial, commercial and residential buildings. It reflects the advancement of available materials and manufacturing technologies and applies to the manufacture of all heavy duty metal gutter systems, not just steel.

Metal guttering systems are designed and manufactured to give many years of reliable service and detailed advice is available from individual MGMA member companies at

The MGMA is the only organisation which represents the major UK manufacturers and is, therefore, a valuable source of information and advice on all matters relating to metal gutters.

List of guidance documents

GD01 Focus on standard aluminium rainwater systems CPD APPROVED
GD02 Focus on cast iron rainwater systems CPD APPROVED
GD03 Rainwater drainage design EN12056:3-2000
GD04 Focus on seamless aluminium pre-painted gutter systems
GD05 Focus on industrial guttering
GD06 Siphonic roof drainage
GD07 Advantages of painted metal gutters
GD08 Advice on retention of title clauses
GD09 MGMA position statement on CE marking of rainwater goods
GD10 Industrial gutters coating selector
GD11 The re-sealing of joints in cast iron gutters
GD12 Cast iron gutter maintenance
GD13 Industrial metal rainwater systems – inspection and maintenance CPD APPROVED
GD14 Refurbishment of internal metal gutters
GD15 Guidance to the Construction (Design & Management) Regulations 2015
GD16 Eaves gutter installation recommendations CPD APPROVED
GD17 Guidance on industrial membrane gutters
GD18 Eaves gutter design flow
GD19 Guidance on metal rainwater systems and underground drainage
GD20 BS 9101:2017 Steel and aluminium rainwater systems
GD21 Guidance on selecting the correct rainfall intensity  CPD APPROVED