UK Guttering Profiles & Flow Rates
Half-round, square-line, ogee and deep-flow gutter profiles with sizes, flow capacities and bracket spacing for UK roofing.
Common Gutter Profiles
| Profile | Width (mm) | Flow Capacity (l/s) | Downpipe Size (mm) | Max Roof Area (m²) |
|---|---|---|---|---|
| Mini half-round | 75 | ~0.4 | 50 | ~17 |
| Half-round | 112 | ~0.9 | 68 | ~40 |
| Square-line | 114 | ~1.2 | 65 (square) | ~55 |
| Ogee | 115 | ~1.0 | 68 | ~46 |
| Deep-flow (half-round) | 115 | ~1.5 | 68 | ~68 |
| Industrial/deep-flow | 170 | ~2.8 | 110 | ~130 |
Flow capacities are approximate for a single outlet at one end with standard fall. Central outlet doubles effective capacity.
Downpipe Sizes
| Type | Size (mm) | Compatible Gutters |
|---|---|---|
| Round | 50 | Mini half-round (75 mm) |
| Round | 68 | 112 mm half-round, ogee, deep-flow |
| Square | 65 | Square-line (114 mm) |
| Round | 110 | Industrial / 170 mm gutters |
Material Options
| Material | Typical Lifespan | Bracket Spacing | Notes |
|---|---|---|---|
| PVC (uPVC) | 15–25 years | Max 1 m | Cheapest, most common, colours fade |
| Aluminium | 30–50 years | Max 1.2 m | Lightweight, durable, powder-coated |
| Cast iron | 50–100+ years | Max 1.2 m | Heritage, heavy, needs repainting |
| Zinc / copper | 50–80 years | Max 1 m | Premium, patinas naturally, bespoke |
Related Calculators
See the Drainage Pipe Sizes for connecting to underground drainage, or the Rafter Calculator for roof area calculations.
How We Calculate This
Frequently Asked Questions
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Last updated: April 2026
All calculations are estimates. Verify with your supplier.