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Rainwater Specification
Heritage Foundry specification: R10 Rainwater Drainage Systems
General
- Gravity rainwater drainage system.
- Rainwater outlets, gutters, pipework and accessories as detailed below.
System performance
- Design standard
- To BS EN 12056-3:2000, clauses 3 to 7 and National Annexes.
- Collection and distribution of rainwater
- Complete, and without leakage or noise nuisance.
- Design parameters
- Design rate of rainfall as per BS EN 12056-3:2000, National Annex NB 2, Category 1.
Products: Heritage Foundry gutter
- Gutter and fittings to
- BS 8530 (formerly BS 2997).
- Reference
- Heritage Foundry rainwater system.
- Profile
- Half Round / Beaded Half Round / Deep Run Half Round / Victorian Ogee / Traditional Ogee / Moulded Ogee.
- Size
- 100mm / 114mm / 125mm / 150mm / 100 x 75mm / 125 x 75mm / 125 x 100mm / 150 x 100mm.
- Outlet size
- 63mm / 75mm / 100mm / 75 x 75mm / 100 x 75mm / 100 x 100mm.
- Manufacture
- Complies with BS 460:2000 Cast Iron Rainwater Goods.
- Finish
- Heritage Transit Primed (for site painting) or Heritage Premier 4 Coat Factory Painted Finish.
- Colour
- To be advised.
- Jointing
- Gutter lengths or fittings are overlapped at the joint with a spigot and socket. Slots are provided for fixing with M6 mushroom head zinc plated nuts and washers. Seal evenly across the joints with Dow Corning 791.
- Fixing
- Fascia brackets fixed at 915mm centres and at each fitting, with number 12 x 38mm round head twin thread screws and washers, bright zinc plated.
Products: Heritage Foundry downpipe
- Reference
- Heritage Foundry rainwater pipe with eared or plain (non-eared) collars. Fittings and accessories to BS 2997.
- Size
- 63mm / 75mm / 100mm / 75 x 75mm / 100 x 75mm / 100 x 100mm.
- Manufacture
- Complies with BS 460:2000 Cast Iron Rainwater Goods.
- Finish
- Heritage Transit Primed (for site painting) or Heritage Premier 4 Coat Factory Painted Finish.
- Colour
- To be advised.
- Fixing
- Pipe clips fixed at maximum 1.83m centres. Plug and screw to the wall with M8 x 75mm coach bolts, bright zinc plated to BS 1706:1960 Class ZN3. Seal joints with Dow Corning 791 silicone sealant, allowing a 3 to 4mm vertical thermal movement gap.
- Accessories
- Bends, branches, access pipes, offsets, shoes, rainwater heads.
Care and maintenance
Routine inspection
Regularly clean out rainwater heads and gutters, and make sure downpipes are clear at all times. Check that joints and fixings are secure by periodic inspection, not less than twice a year, preferably at the beginning of autumn and again at the end of winter. With a reasonable standard of maintenance, a sand cast iron installation should have a life of at least 40 years.
Ladders
Even with a well-fixed installation, ladders should not be rested against the gutter.
Repainting
The final paint finish on factory-primed cast iron must be maintained to give the longest service life. A well-applied paint system might be expected to last 6 to 8 years on cast iron without further attention. Regular inspection is recommended.
Pre-finished cast iron should be maintained in the same way. Any installation damage to the coating must be repaired with the appropriate touch-up paint. Any cut pieces that expose bare metal must be coated with primer and top coat.
Other maintenance operations
When cleaning adjacent surfaces, protect cast iron against all acids and concentrated alkalis.
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