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Use our rainwater drainage calculator to calculate your property's flow requirements or ‘flow capacity’ of the gutters you're considering purchasing.
Harmer Cast Iron Roof Outlets
Harmer Cast Iron Roof outlets provide a practical solution to many building drainage applications. Inherently strong, cast iron is an ideal choice for load bearing applications.
Key Benefits
- Compatible with Harmer SML lightweight cast lightweight cast iron drainage systems. View our range here.
- Provide flat roof drainage for warm, cold and inverted roofs
- For flat roof structures with in-situ cast concrete, timber or lightweight metal deck construction
- Ideal for use with copper and lead-clad roofs where the risk of bi-metallic corrosion is high
