Delta CDP

The Dales Delta range are efficient box gutters designed to give low maintenance longevity with high capacities at comparatively low cost. They are jointed using Dales unique overstrap joint system which has proven to give effective joint life of over 35 years.

ProfileDelta 200

Delta 150

Delta 125

Delta 100
Nominal Dimensions (mm)200x190
Gutter capacity17.66 l/s10.36 l/s6.72 l/s4.83 l/s
Outlet type and capacity
76.2mm round2.74 l/s2.46 l/s
76.2mm square3.43 l/s3.07 l/s
101.6mm round6.07 l/s5.38 l/s4.99 l/s4.35 l/s
101.6mm square7.46 l/s6.62 l/s6.13 l/s5.40 l/s
152.4mm round17.25 l/s14.34 l/s

Specification clauses 

PPC finish
Anodised finish
PPC finish
Anodised finish
PPC finish
Anodised finish
PPC finish
Anodised finish




On receipt of project drawings, we assign a Project Manager to each project. They provide a single point of contact throughout the life of the project, from initial design to completion. To discuss the requirements for your project, our Project Management Team can be contacted on Tel: 0115 930 1521.

Professional Indemnity Insurance

Dales Fabrications hold full Design/Professional Indemnity Insurance with a first-class security in the London market. This allows architects and specifiers to use our products with confidence.

BS EN ISO 9001: Design & Manufacture

Dales Fabrications have been working within the constraints of BS EN ISO 9001 accreditation since 1993. Our ISO 9001: Design & Manufacture certificate is available to view here.


Roof Drainage and Gutter System Design

Dales project managers can provide a gutter system designed to suit your individual project requirements incorporating gutter and outlet and positioning advice in accordance with BS EN 12056-3 for a given design rate of rainfall. To use this service please contact a member of our project management team on t. 0115 930 1521.

Flow Capacities

All published flow capacities contained in this literature are calculated in accordance with the recommendations contained in BS EN 12056-3: 2000. Dales policy is not to issue high, although genuine, experimental results which include no margin of safety.

Lead times

All the standard gutter profiles shown in this literature are available in Dales Standard Colours in less than two weeks.
For 152.4mm pipes (either dia or sq), SecretFix VR pipe systems or if lead times are important, please call us on Tel: 0115 930 1521 to discuss your requirements.

Purpose-made hoppers and other Specials

Dales are a specialist manufacturer of both standard and bespoke items and we are happy to help specifiers achieve their design
ideas. If you have a suitable project please email drawings to

Lightning Conductivity

Dales aluminium gutters and down-pipes can usually be rendered electrically continuous using the Dales lightning conductivity clip, as part of a lightning protection system. This can be discussed with a Dales project manager and a detail can be provided.
Aluminium gutters and pipes are not suitable as the sole lightning protection system for any building and should only be utilised as part of an overall lightning protection design. Specifiers should refer to the latest EN BS standard concerning the protection of structures against lightning for further information.


Fascia Profiles

Dales design and manufacture fascia profiles to almost any shape, size or proportion including curved and elliptical designs. As part of our specification service preliminary drawings can be prepared for integration into your project drawings. All systems are designed on an individual project basis and a 25 year guarantee may be available, subject to terms and conditions. Example drawings can be downloaded here.

Soffit Systems

Dales offer a variety of soffit systems, from secret fix panels to secret-fix planks, more details are available here.

Rainscreen panels

Dales design and manufacture aluminium rainscreen panels on a bespoke basis to suit each individual project, more detail available here.

Support Systems

More information of the various support systems that Dales can provide is available here.

Wall Copings

Dales design and manufacture aluminium wall copings on a bespoke basis to suit each individual project, more details are available here.


Fire: Aluminium & Finishes

Dales manufacture standard gutters & pipes in either Anodised Aluminium or architectural polyester powder coating finishes.
Under Classification Reaction to Fire EN BS 13501-1:2018 Anodised Aluminium is classified as A1 non-combustible and makes ‘no contribution to fire”. Polyester Powder Coatings are A2 s1, d0, under EN BS 13501-1: 2018, which is also classified as non-combustible under the requirements for walls of relevant buildings over 18m as required by Building Regulations Part B: Fire Safety.

Syntha Pulvin (Sherwin Williams), Interpon D (Akzo Nobel) & Drylac (Tiger) are independent and separate manufacturers of architectural polyester powder coatings for aluminium and each manufacturer unequivocally states that all their ppc products are: A2 s1, d0 very limited combustibility (EN 13501-1 Classification of reaction to fire). Each manufacturer can provide fire test evidence conducted by independent test laboratories, if required.

Specifiers, Developers and Main contractors are further invited to consider the RIBA Fire resources web page at


Dales manufacture standard gutters & pipes in either Anodised Aluminium or architectural polyester powder coating finishes. Details of the huge range of colours and finishes available can be found here.

Anodised Aluminium Colour Range

Details of the anodised colour ranges available can be found here. Please must also refer to Dales terms and conditions relating to anodised aluminium finishes.

Polyester Powder Coatings:

Dales recommend Syntha Pulvin (Sherwin Williams) architectural polyester powder coatings for aluminium products coated at its Syntha Pulvin Approved & ISO 9001:2015 Quality Assured coating facility in Ilkeston.

All powder coated items are coated in accordance with the stringent standards demanded by Syntha Pulvin as part of their accreditation process which meets or exceeds the minimum requirements of BS 12206-1 2004.

Dales also supply aluminium products in Syntha Pulvin (Sherwin Williams), Interpon D (Akzo Nobel) and Drylac (Tiger) architectural polyester powder coatings using only each manufacturer’s Third Party Approved Applicators.


Dales products, whether supplied in anodised or architectural polyester powder coated finish can usually be provided with guarantees, dependant on their geographical location and specific environment and subject to terms and conditions.

Marine Specification:

It is the specifier’s responsibility to ensure that Marine Specification is specified in the contract particulars, and our Project Managers can assist by advising on and providing appropriate NBS Specification clauses.

Any guarantee which the polyester paint manufacturer or anodiser will offer is determined by them on an individual project basis upon completion of a questionnaire submitted by the customer and possible site visit, both of which must be completed prior to any order being placed. It should be borne in mind that if the goods are on the seafront, or within 1km of the sea, then a paint manufacture may not offer a guarantee, but anodisers might.

In locations with high levels of UV light, such as the coast, anodised finish is recommended purely from a performance criteria. If a polyester powder coating finish is preferred then Dales recommend Qualicoat 2 Marine specification should be used.
For a Marine Specification guarantee to be considered, a minimum of 60 microns of paint must be applied to both internal and external surfaces and stainless steel fixings are required throughout.

Acutely Exposed or Industrial Environments

For acutely exposed marine or industrial environments Marine Specification can be further upgraded in several ways, which includes one or more of the following:

  • changing the base aluminium alloy to a ship-building alloy,
  • changing the powder coating to Qualicoat 2 specification,
  • amending secondary supports to all aluminium,
  • changing fixings to A4 stainless steel (provided such suitable fixings are available) or moving to an anodised finish.

If you consider that your project may be in an acutely exposed marine or industrial environment, please contact one of our Directors or Project Managers to discuss this further. Please bear in mind it is not always possible to guarantee products installed in harsh environments.

Durability, Loadings & 3D Modelling


Dales systems are designed to give a low maintenance life of 60 years in rural and suburban conditions & up to 25 years in industrial conditions, dependant on the exact environment. For advice marine environments please see above.

Installation, Operation & Maintenance Information

As part of the Dales Project Management: Design & Specification Service a full technical guide is issued to site that includes A3 copies of all Dales detail proposal drawings in full colour and generic system fixing instructions as a comprehensive Technical Guide. This also includes a comprehensive ‘Fixings Identification List’ that identifies where each fixing is supposed to use, the same information is noted on the detail proposal drawings too.

It is the customer’s responsibility to request a full O&M pack from Dales, which will include a complete detail drawings pack and the relevant generic fixing instructions complete with the maintenance schedule and any guarantee originally requested in the original customer order.

Loadings: General

Dales gutter systems are designed to accommodate loadings in excess of those induced when the system is operating at full capacity and are compliant with BS 9101:2017. Snow guards are recommended where sliding snow may cause impact loading in excess of normal design criteria. (see BS EN 12056-3: 2000 National Annex NB clause NB.4)

Thermal movement

Dales design all systems to accommodate the extremes of temperature typical in the UK. For overseas projects, please contact Dales to discuss the requirements of your project.


Curved or Facetted Gutters

The visual effect of a finished curved system whilst technically demanding and costly always gives a finished project a ‘landmark’ quality. Dales have a long heritage of designing and manufacturing curved products since the business was first established in 1977.

When specifying curved systems, it is recommended that one of our Directors or experienced Project Managers meet with the project design team to discuss the possibilities, use the chat facility or call us on t.0115 930 1521

Modulation to Grid or Curtain-walling

Gutter systems are most often supplied in standard lengths, usually 3m, and modulation with grid or curtain-walling mullions is not normally considered necessary. If modulation is required, it should be identified in the NBS Specification clause and Dales Project Managers can assist and advise on any costing implications that may arise due to modulation.


Fixings present a potential weak link in any system, as such Dales take the process of fixing selection as seriously as the design of the system itself. All fixings have been selected after careful consultation with manufacturers and rigorous testing for both ultimate strengths and potential incompatibility issues. All necessary fixings are supplied as part of the complete package from Dales.


Aluminium: The sustainable choice

More on the sustainability of aluminium is available here.

Environmental Policy

Our environmental policy is available to view here.

Responsible Sourcing

Our Responsible Sourcing policy is available to view here.

Preferred Installer Network

Our network of Preferred Installers are available to provide a full supply and fix package. When a price is requested Dales can advise which Preferred Installers will be suitable dependant on the size and type of products to be installed.

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