Alumasc Cast Aluminium Circular Downpipes

The shape handles water flow efficiently and fits well with most gutter profiles. It’s also the easiest to align and install on uneven façades.

Alumasc circular downpipes typically come in 63mm–150mm diameters. Match the size to the outlet capacity, for most domestic roofs 63–75mm is ideal.

They use traditional socket-and-spigot joints that replicate cast iron. A bead of sealant or EPDM gasket ensures watertightness while allowing expansion.

Yes - they’re timeless. Black or dark grey finishes look traditional; lighter colours or bare metal finishes work for contemporary builds.

Start with the top bracket, use a plumb line or laser, and dry-fit two or three sections before fixing permanently. Minor deviations are easy to correct because of the round shape.

Yes, Alumasc supplies matching offsets, branches, and shoes for each diameter. These make adapting to eaves or projections straightforward.

Excellent. Their internal smoothness maintains consistent flow, and their geometry resists torsion from wind better than rectangular types.

A neutral-cure silicone or the manufacturer’s approved low-modulus sealant. Avoid anything acidic which can damage the coating.