Installing a Flat Roof Access Hatch

Safe, convenient access to a flat roof makes maintenance and inspections much easier. An access hatch — properly detailed and waterproofed — is a worthwhile addition to any flat roof that needs regular inspection.

Why Proper Access Matters

Without safe access, maintenance often doesn't happen. People balance on makeshift arrangements or don't access the roof at all, which means drainage goes unchecked and small problems grow into large ones. A proper hatch makes it safe and straightforward.

Types of Access Hatch

• Simple hatch doors: hinged panel in the roof that lifts from below, suitable for occasional access
• Hatches with integral ladder: combined unit with a fixed ladder and hatch, good for regular access
• Automatic hatches: electrically operated, for commercial buildings with frequent access needs

Waterproofing the Hatch

The hatch frame must be properly kerbed and waterproofed in exactly the same way as a rooflight. The kerb must be a minimum of 150mm above the finished roof surface, and the roofing membrane must be dressed up the kerb and terminated correctly.

Building Regulations

Installation of a roof access hatch doesn't normally require building regulations approval as a standalone repair. If it's part of a re-roofing or extension project, the project will be subject to normal building control requirements.