Aluminium Box Gutter

What the Aluminium Box Gutter Range Includes

This subcategory brings together the components needed to build a coordinated aluminium box gutter run. The range includes the 3m aluminium box gutter length, 90° and 135° internal and external corners, internal and external stopends, fascia brackets, union joiners, round outlets and box outlets.

Matching colour-coded fasteners for metal or timber, coloured sealant, spray cans and touch-up paint are also available for finishing and minor exposed-edge work.

The standard 3m gutter length is offered in three confirmed profile sizes:

• 100mm × 75mm
• 125mm × 100mm
• 150mm × 100mm

These measurements refer to the gutter sole and upstand. Corners, stopends and other fittings should be selected in the same corresponding profile size throughout the gutter run.

What Is a Box Gutter Used For?

A box gutter collects water from the roof edge and directs it towards an outlet and compatible downpipe. Its straight-sided profile can suit residential and commercial buildings, conservatories and flat roof projects where a more geometric roofline detail is required.

For a more detailed explanation of the system, read our guide covering what a box gutter is and how it works.

Aluminium is well suited to external rainwater goods because it is lightweight, corrosion-resistant and requires relatively little maintenance. A correctly planned fall is still essential. Without a suitable gradient, correctly positioned outlets and regular clearing, leaves or standing water can contribute to blockages, overflow or water ingress.

How the Components Work Together

Straight 3m lengths form the main gutter run. Union joiners connect adjoining lengths, fascia brackets support the system and stopends close the open ends.

Internal and external corner pieces allow the gutter to follow 90° or 135° changes in the building line. Water then leaves the gutter through either a round outlet or a box outlet before entering the selected downpipe.

A round outlet should be planned alongside a compatible aluminium round downpipe. Where a square or rectangular connection is required, review the available aluminium square downpipe range.

Select the outlet and downpipe together rather than treating them as separate purchases. The connection profile and dimensions should be checked on the relevant product pages or confirmed with Metal Profiles Ltd before ordering.

How to Choose the Right Box Gutter Products

Before choosing an aluminium box gutter system, record:

• The total gutter run and number of 3m lengths required.
• The required gutter sole and upstand dimensions.
• Every internal and external corner.
• Whether each corner is 90° or 135°.
• The number and intended position of outlets.
• Whether a round or box-profile downpipe will be used.
• The number of stopends, union joiners and fascia brackets required.
• Whether the fixings will be installed into metal or timber.
• The required Mill Finish or RAL colour.

Common ordering mistakes include mixing fittings from different profile sizes, selecting an external corner instead of an internal corner, overlooking stopends and assuming an outlet will connect to an existing downpipe without checking its dimensions.

For a box gutter repair or replacement, measure the existing gutter profile and outlet connection rather than ordering from appearance alone. The roof drainage layout, gutter fall and outlet capacity should be checked by the project designer, roofing contractor or installer.

Standard Products or Bespoke Fabrication?

Standard components will normally suit straightforward gutter runs using the listed profile sizes and corner angles.

Bespoke fabrication may be required where drawings show:

• Non-standard gutter dimensions.
• Unusual internal or external angles.
• Awkward roof transitions.
• Project-specific outlet positions.
• A customised flat roof box gutter detail.
• Connections to an existing drainage system.

The bespoke aluminium box gutter case study provides a useful example of how a project-specific system can be developed for a more complex building requirement.

For an accurate estimate, provide the gutter dimensions, total lengths, corner directions, outlet positions, downpipe type, finish and any relevant drawings.

Supporting the Wider Rainwater System

An aluminium box gutter is one part of a complete roof drainage arrangement. Outlets, downpipes, brackets and fittings must work together to carry rainwater away from the roof and building foundations.

You can view the wider aluminium Rainwater Goods range when coordinating box gutters with downpipes, alternative gutter profiles and related accessories.

Architects, contractors and specifiers can also review the available NBS specification information when preparing project documentation.

Metal Profiles Ltd supplies standard and project-specific aluminium rainwater goods from Highlands Farm, Southend Road, Rettendon Common, Chelmsford, Essex, with enquiries supported across London and the wider UK.

Frequently Asked Questions

What is an aluminium box gutter used for?

An aluminium box gutter collects rainwater at roof level and directs it towards an outlet and compatible downpipe. It can be used on residential, commercial, conservatory and flat roof projects.

How do I choose the right box gutter size?

Start with the required gutter sole and upstand dimensions. Standard sizes in this range include 100mm × 75mm, 125mm × 100mm and 150mm × 100mm. The roof area, gutter fall, outlet position and downpipe arrangement should also be reviewed by the project designer or installer.

Are bespoke aluminium box gutter sizes available?

Bespoke gutter fabrication can be considered where the standard sizes or corner angles do not suit the project. Provide the required dimensions, drawings, angles, outlet positions and finish information for review.

What finishes and colours are available?

Mill Finish and a selection of RAL colours are shown across the aluminium box gutter products. Confirm the exact colour on the selected product page before ordering. Matching coloured sealant, fasteners, spray cans and touch-up paint are also available.

How does a box gutter connect to a downpipe?

Rainwater leaves the gutter through either a round outlet or a box outlet. The outlet dimensions and profile must correspond with the chosen downpipe, so both components should be checked together.

How do I request an aluminium box gutter estimate?

Complete the Metal Profiles Ltd estimate request form and include the gutter size, total run lengths, corner requirements, outlet positions, downpipe type, finish and any available project drawings.