Hi-Cap Rainwater System
Technical Data Sheet
Document Reference: TDS-RW-HC-001
Issue Date: February 2026
System: 145mm Hi-Cap with 82mm Round Downpipe
Product Description
The Kalsi Hi-Cap rainwater system provides high-capacity water management for commercial and larger residential applications. The robust half-round profile handles significant water volumes from larger roof areas, making it ideal for industrial buildings, warehouses, agricultural structures, and commercial developments where drainage capacity is critical.
System Dimensions
Gutter
| Dimension | Value | Tolerance |
|---|---|---|
| Profile width (top) | 145mm | ±1mm |
| Profile depth | 75mm | ±1mm |
| Wall thickness | 2.5mm | ±0.2mm |
| Available lengths | 4m | ±5mm |
| Weight | 0.98 kg/m | - |
Downpipe
| Dimension | Value | Tolerance |
|---|---|---|
| External diameter | 82mm | ±0.5mm |
| Internal diameter | 74mm | ±0.5mm |
| Wall thickness | 4.0mm | ±0.2mm |
| Available lengths | 4m, 5.5m | ±5mm |
| Weight | 0.82 kg/m | - |
Hydraulic Performance
Gutter Flow Capacity
| Gradient | Outlet Position | Flow Rate |
|---|---|---|
| 1:600 | End outlet | 3.10 L/s |
| 1:350 | End outlet | 3.70 L/s |
| Level | Centre outlet | 5.50 L/s |
Downpipe Capacity
| Condition | Flow Rate |
|---|---|
| Full bore | 5.80 L/s |
| 1/3 full | 2.90 L/s |
Maximum Effective Roof Area
| Rainfall Intensity | Max Roof Area |
|---|---|
| 75mm/hr (standard) | 260m² |
| 100mm/hr (exposed) | 195m² |
| 150mm/hr (high exposure) | 130m² |
Material Specification
| Property | Specification |
|---|---|
| Material | PVC-U (unplasticised polyvinyl chloride) |
| Standard | BS EN 607:2004 |
| Formulation | Lead-free, cadmium-free |
| UV stabilisation | Co-extruded cap layer |
Colour Options
| Colour | Part Code Suffix | Availability |
|---|---|---|
| Black | BL | Standard stock |
| Grey | G | Standard stock |
Product Range Summary
Gutters
| Description | Part Code | Pack Qty |
|---|---|---|
| 145mm Hi-Cap Gutter 4m | HCG4* | 4 |
Angles
| Description | Part Code | Angle | Pack Qty |
|---|---|---|---|
| 90° Gutter Angle | HCA90* | 90° | 15 |
| 135° Gutter Angle | HCA135* | 135° | 15 |
Stop Ends & Outlets
| Description | Part Code | Pack Qty |
|---|---|---|
| External Stop End | HCE1* | 40 |
| Internal Stop End | HCE2* | 40 |
| Running Outlet | HCO1* | 15 |
Brackets
| Description | Part Code | Pack Qty |
|---|---|---|
| Fascia Bracket | HCK1* | 50 |
| Union Bracket | HCU1* | 25 |
Downpipes
| Description | Part Code | Length | Pack Qty |
|---|---|---|---|
| 82mm Round Downpipe | HCP4* | 4m | 4 |
| 82mm Round Downpipe | HCP5.5* | 5.5m | 4 |
Downpipe Fittings
| Description | Part Code | Pack Qty |
|---|---|---|
| 92.5° Offset Bend | HCB1* | 25 |
| 112.5° Offset Bend | HCB2* | 25 |
| Pipe Shoe | HCB3* | 25 |
| Pipe Clip | HCC1* | 50 |
| Pipe Socket | HCS1* | 30 |
Applications
Ideal For
- Industrial units and warehouses
- Agricultural buildings
- Large commercial properties
- Sports facilities
- School buildings
- Shopping centres
- Multi-storey car parks
Key Considerations
- Calculate roof area carefully for commercial installations
- Consider multiple outlets for very large roof areas
- May require larger underground drainage connection
Installation Guidelines
Gutter Installation
- Maximum bracket spacing: 800mm
- Near joints/fittings: Within 150mm
- Minimum fall: 1:600
- Expansion gap: 12mm at union joints
Structural Requirements
- Ensure fascia/mounting structure can support loaded weight
- Consider wind loading for exposed commercial installations
- May require additional support for long runs
Standards Compliance
- ✓ BS EN 607:2004
- ✓ BSI Kitemark certified
- ✓ Lead-free formulation
- ✓ ISO 9001:2015 manufactured
- ✓ UK manufactured
Guarantee
Product Guarantee: 10 years against manufacturing defects
© Kalsi Plastics Ltd. All rights reserved.