Kast Iron Effect Rainwater System
Technical Data Sheet
Document Reference: TDS-RW-CI-001
Issue Date: August 2026
System: Kast Iron Half Round and Kast Iron Krown Ogee
Product Description
The Kalsi Kast Iron Effect rainwater system replicates the authentic appearance of traditional cast iron guttering without the maintenance burden. Featuring a textured, cast iron-style finish and heritage black colour, this system is ideal for period properties, conservation areas, and projects where traditional appearance is essential. Made from lightweight, maintenance-free PVC-U.
System Variants
Kast Iron Half Round
Traditional semi-circular profile replicating Victorian-era cast iron guttering.
| Dimension | Value | Tolerance |
|---|---|---|
| Profile width (top) | 112mm | ±1mm |
| Profile depth | 55mm | ±1mm |
| Available lengths | 2m, 4m | ±5mm |
| Downpipe diameter | 68mm round | - |
Kast Iron Krown Ogee
Decorative ogee profile replicating ornate period guttering.
| Dimension | Value | Tolerance |
|---|---|---|
| Profile width (top) | 137mm | ±1mm |
| Profile depth | 90mm | ±1mm |
| Available lengths | 4m | ±5mm |
| Downpipe diameter | 68mm round | - |
Hydraulic Performance
Half Round Flow Capacity
| Gradient | Flow Rate |
|---|---|
| 1:600 | 1.52 L/s |
| Level (centre outlet) | 2.40 L/s |
Maximum Effective Roof Area
| System | Rainfall 75mm/hr |
|---|---|
| Half Round | 114m² |
| Krown Ogee | 200m² |
Material Specification
| Property | Specification |
|---|---|
| Material | PVC-U with cast iron effect finish |
| Finish | Textured matt black |
| Product standard | Confirm the current declaration and testing scope with Kalsi Technical |
| Formulation | Lead-free, cadmium-free |
| UV stabilisation | Enhanced UV stabilisers |
Cast Iron Appearance Features
- Authentic textured surface
- Heritage black colouration
- Authentic period profiles
- Traditional fitting styles
Colour Options
| Colour | Finish | Availability |
|---|---|---|
| Heritage Black | Textured matt | Standard stock |
Cast Iron Effect is only available in Heritage Black to maintain authentic appearance.
Product Range Summary
Kast Iron Half Round
| Description | Part Code | Pack Qty |
|---|---|---|
| Gutter 2m | KIAG2BL | 6 |
| Gutter 4m | KIAG4BL | 6 |
| 90° Angle | KIAA90BL | 20 |
| 135° Angle | KIAA135BL | 20 |
| External Stop End | KIAE1BL | 50 |
| Internal Stop End | KIAE2BL | 50 |
| Running Outlet | KIAO1BL | 20 |
| Fascia Bracket | KIAK1BL | 50 |
| Union Bracket | KIAU1BL | 30 |
Kast Iron Krown Ogee
| Description | Part Code | Pack Qty |
|---|---|---|
| Gutter 4m | KIKG4BL | 4 |
| 90° Angle | KIKA90BL | 15 |
| 135° Angle | KIKA135BL | 15 |
| External Stop End | KIKE1BL | 50 |
| Internal Stop End | KIKE2BL | 50 |
| Running Outlet | KIKO1BL | 20 |
| Fascia Bracket | KIKK1BL | 50 |
| Union Bracket | KIKU1BL | 25 |
Kast Iron Downpipe
| Description | Part Code | Pack Qty |
|---|---|---|
| 68mm Round Downpipe 2.5m | KIAP2.5BL | 6 |
| 68mm Round Downpipe 4m | KIAP4BL | 6 |
| 92.5° Offset Bend | KIAB1BL | 30 |
| 112.5° Offset Bend | KIAB2BL | 30 |
| Pipe Shoe | KIAB3BL | 30 |
| Pipe Clip | KIAC1BL | 100 |
Conservation Area Suitability
The Kast Iron Effect range is designed for use in:
- Conservation areas
- Listed buildings (subject to approval)
- Period property renovations
- Heritage developments
- National Trust and English Heritage projects
Benefits Over Genuine Cast Iron
| Feature | Cast Iron | Kast Iron Effect |
|---|---|---|
| Weight | Heavy | Lightweight |
| Rust | Yes | No |
| Painting | Required every 3-5 years | Never |
| Lifespan | 50+ years with maintenance | 50+ years maintenance-free |
| Installation | Specialist required | Standard installer |
| Cost | Premium | Moderate |
Installation Guidelines
Gutter Installation
- Maximum fascia bracket spacing: 600mm
- Heavy snow or extreme weather conditions: 300mm maximum
- Near joints/fittings: Within 150mm
- Minimum fall: 1:600
- Handle with care to avoid scratching textured finish
Conservation Considerations
- Check with local planning before installation
- Document existing system for reference
- Match profile to original where possible
- Retain any decorative hoppers if original
Standards Compliance
- Current standards, declarations and certification scope are available from Kalsi Technical
- ✓ Lead-free formulation
- ✓ ISO 9001:2015 manufactured
- ✓ UK manufactured
Guarantee
Rainwater Guarantee: Cast effect: 10 years. Full written terms apply.
© Kalsi Plastics Ltd. All rights reserved.