Alumasc Cast Iron Deep Half Round Guttering

It increases capacity for steep pitches and high rainfall zones without moving to a box profile, reducing overflow risk at eaves.

Bracket centres remain similar but expect slightly heavier runs. Double-bracket near outlets and angle pieces to control deflection under load.

Use low-modulus neutral cure silicone approved for cast iron and ensure even compression at the joint bolts to avoid capillary draw.

All Alumasc Apex Heritage cast iron gutters, downpipes and fittings are manufactured to BS 460:2002 for cast iron rainwater goods and supplied either factory primed or with a high-performance two-pack painted finish. Factory finishes are certified for long-term protection and colour consistency.

Most gutters and downpipes are supplied in 1.83 m (6 ft) lengths. Gutters are typically bracketed at 915 mm centres with extra brackets either side of joints, outlets and angles, and set to a fall of roughly 1:600 to 1:350.

Traditional spigot-into-socket joints are made using a low-modulus silicone or rubberised bitumen mastic, then bolted through the pre-drilled joint holes using corrosion-resistant bolts and washers.

Cast iron is extremely strong, vandal-resistant and dimensionally stable. Life expectancy is typically 40+ years with correct installation and periodic maintenance. Factory-painted finishes minimise site time; primed goods can be site painted to the required scheme.

Yes. They are widely used on listed and conservation properties because they replicate traditional profiles and details, and cast iron is 100% recyclable at end of life.