Aluminium Gutters Direct

Alumasc Cast Iron Half Round Guttering

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ALUMASC CAST IRON HALF ROUND GUTTERING · COMMON QUESTIONS

Something not answered here? The technical desk takes calls on 0330 0539354
Why is half round still the default on many jobs?
It’s versatile, easy to set out, and compatible with every accessory and outlet, making repairs and extensions simple.
What bracket spacing should I allow?
Plan for roughly 915 mm with additional brackets at joints, outlets and angles, then confirm against site exposure.
How do I cut and dress cast iron on site?
Use a fine-tooth blade or thin abrasive disc, de-burr, prime cut faces and bolt through the pre-drilled joint holes with sealant.
What standards and finishes do Alumasc cast iron rainwater products comply with?
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.
What are the typical lengths, bracket centres and falls for installation?
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.
How are joints made and sealed on site?
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.
What about durability, repainting and lifecycle?
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.
Are Alumasc cast iron systems suitable for heritage and sustainable projects?
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.