HALF ROUND ALUMINIUM GUTTERS

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5 day lead time for Textured black and RAL 7016 Anthracite Grey. Other standard colours 10 working days.

Alugutters Traditional Half Round Aluminium Gutter System combines the traditional look and feel of a cast iron rainwater system with the advantages of a modern, low maintenance material. Made from marine grade aluminium, the system is lighter than cast iron and will not rust or require regular repainting, making it a more cost-effective and durable choice for your home or business.

Our gutters are polyester powder coated with architectural external grade paint, providing a durable and low-maintenance finish that will last for years to come. The powder coating process ensures a consistent and long-lasting colour, and will not fade or peel like other coatings. And because aluminium is a fully sustainable building material, it is also an environmentally friendly choice.

Designed and manufactured in the UK by ourselves, our Traditional Half Round Aluminium Gutter System offers a high-quality solution to your rainwater management needs. With a fire class rating of A2-s1,d0, it can be used on any building, at any height, making it a versatile choice for both residential and commercial properties.

We take pride in the quality of our products, and our team of experts is always available to provide support and advice to ensure the best possible result for your project. With short lead times, competitive pricing, and a wide range of colour options, the Traditional Half Round Aluminium Gutter System is an excellent choice for anyone looking for a premium, low-maintenance solution to their rainwater management needs.

Our Half Round Guttering system is suitable for use with the following circular downpipes:

63mm Flush Joint and Traditional style.
76mm Flush Joint and Traditional style.

View our downpipe systems.

A Half Round Gutter System - Built To Last!

The Alugutter Difference: Superior 5-Stage Polyester Powder Coating

Hand Sanding: Every item is manually abraded to create a superior surface key.
Chemical Degreasing: Removal of all contaminants.
Etch Priming: A specialist primer is applied to chemically bond with the alloy.
Powder Coating: Application of Interpon D1036 architectural-grade polyester powder.
Curing: Baked for a hard, fade-resistant finish.

Paint Colours

Our systems are offered in a variety of RAL colour options with our Textured black and RAL 7016 Anthracite Grey being stocked colours for shorter lead times. Non standard colours are also available but are subject to an additional charge - Please contact us for pricing.

How To Install Our Aluminium Half Round Gutters

Bracket Types and Spacing

Half Round gutter brackets are spaced at maximum 1m centres but can be reduced if installation is being carried out in areas susceptible to high winds or heavy snow fall. We offer offer various types of Half Round Gutter fixing brackets including fascia board fixed, direct fix to rafter arms and rise and fall spikes that are set into brickwork.

Half Round Gutter Jointing

Our Snap Fit jointing method makes Installation simple, tidy and quick. A bead of our high performance silicone sealant (part code SU1) is applied between the foam spacers within each jointer, outlet and angle. The joints are then simply clicked together over the gutter lengths.

Technical Specifications and Performance

Specification	Details
Profile Size	125mm – Standard half round
Material	Marine-grade aluminium with PPC finish
Flow Capacity	End outlet: 1.25 L/s; Central outlet: 2.5 L/s (with 63mm or 76mm downpipe at 75mm/hr rainfall)
Max Roof Area	Up to 133m² per downpipe (depending on configuration)
Bracket Spacing	1m centres; adjustable for load
Colours	Stocked: Textured black, RAL 7016 Anthracite Grey; Standard/custom: Any RAL/BS
Lead Time	Stocked colours: 5 working days; Standard colours: 10 working days
Compliance	BS 8530:2010, BS 9101:2017, BS EN 1462:2004; Fire rating A2-s1,d0
Life Expectancy	50+ years

Why Choose Extruded Over Alternatives?

Compare systems:

Feature	Alugutter Extruded System	Seamless Gutters	Cast Iron
Gauge / Strength	Thick-Gauge Extruded (Superior durability)	Thin-gauge roll-formed (Less rigid)	Heavy, prone to cracking
Joint Integrity	Precision metal fittings	PVC joints (Expansion risks)	Sealant-heavy, labour-intensive
Lifespan / Maintenance	50+ years, minimal care	Installer-dependent	Regular de-rusting

Frequently Asked Questions About 125mm Half Round Aluminium Gutters

What are 125mm half round aluminium gutters?

Half round gutters feature a semi-circular profile inspired by traditional cast iron designs. Our 125mm version is made from marine-grade aluminium for a lightweight, durable alternative suitable for heritage or modern UK properties.

What's the difference between aluminium and cast iron half round gutters?

Aluminium is lighter, rust-proof, and easier to install than cast iron, with no need for regular painting. It offers similar aesthetics but with modern durability and sustainability.

How long do 125mm half round aluminium gutters last?

With proper installation, expect 50+ years. They're corrosion-resistant and require minimal maintenance, outperforming PVC or steel in harsh weather.

Are these gutters easy to install?

Yes—snap-fit joints with silicone sealant. Use brackets at 1m intervals; no specialist tools needed beyond basic fixings.

What colours are available for 125mm half round gutters?

Stocked in textured black and RAL 7016 Anthracite Grey (5-day lead); standard colours in 10 days, or custom RAL/BS. Contact us for samples or pricing.

What is the flow capacity of these gutters?

End outlet: 1.25 L/s; central outlet: 2.5 L/s, handling roofs up to 133m² per downpipe. Ideal for UK climates.

Do they comply with UK building standards?

Yes, BS EN 607, BS EN 1462, BS EN 12200, with fire rating A2-s1,d0. Fully recyclable and sustainable.

How do I maintain half round aluminium gutters?

Clean annually with a soft brush to remove debris. No initial painting needed; repaint after decades if the finish fades.

Are they compatible with cast iron systems?

Yes, dimensions match traditional cast iron for easy replacement. Pair with our 63mm/76mm round downpipes for a seamless fit.

Why choose aluminium over other materials for half round gutters?

Aluminium is cost-effective long-term, lighter for installation, and resistant to corrosion without the weight or maintenance issues of iron or steel.

Half Round Gutter Drainage Performance

Gutter Type	Downpipe Size	End Outlet	Central Outlet
Half Round Gutter	63mmØ	1.25 l/s	2.5 l/s
Half Round Gutter	76mmØ	1.25 l/s	2.5 l/s

To compliment our gutter systems, in terms of colour and durability, we also offer polyester powder coated aluminium fascia and soffit systems in various sizes and profiles. View our Fascia and Soffit systems.