Flat roofs in South East London

Questions to resolve beneath a flat roof surface

1. Locate the discharge point. We identify where the roof should drain and inspect the route into the gutter or outlet. Water gathering at the far corner can reveal a fall problem that a fresh membrane alone would repeat.
2. Determine the deck condition. Boards need adequate support and a suitable dry surface for the chosen system. Opening the roof establishes the extent of damp damage, including board edges and joist ends beside a persistently leaking upstand.
3. Design the thermal arrangement. A warm roof places insulation above the structural deck within a coordinated build-up. We assess the available height and moisture control requirements, then specify the arrangement appropriate to the existing extension or dormer.
4. Detail every interruption. Roof openings, soil pipes and changes in level interrupt the main sheet or coating. Their supports, collars and upstands are planned with the waterproofing system, so detailing is resolved before the broad surface is installed.
5. Set the perimeter levels. Rear extensions in Lewisham and dormers in Bromley can have tight clearances. We check the new surface against brickwork, sills and gutters to keep a workable weathering height at each edge.

Select the system around the roof construction

• Bonded EPDM rubber: EPDM can cover a simple rectangular roof with a single field sheet bonded to a suitable substrate. Corners, outlets and terminations still require their own compatible accessories, with careful adhesion at the perimeter.
• Reinforced torch-on felt: A specified felt system uses bonded layers with properly formed laps and upstands. The method accounts for nearby combustible details, with suitable alternative application arrangements where direct torch use would create a risk.
• GRP fibreglass: Glass reinforcement and resin create the waterproof layer over a suitable deck, finished with the specified topcoat and trims. Deck joints, preparation and application conditions all influence the finished surface and its ability to accommodate movement.
• A focused detail repair: A sound roof with a failed trim or isolated puncture can be assessed for a compatible repair. If water originates from an adjacent pitched slope, our roof repair service addresses that source instead of renewing an unaffected flat covering.

How long flat roofs takes

The amount of work below the surface is a major part of the programme. A covering replacement on a sound garage deck differs from an extension needing boards, insulation and drainage adjustments. We allow for substrate preparation and the chosen system's application conditions, explaining each stage before the roof is opened.

What affects the price

• Flat roof dimensions and the number of separate roof levels
• Selected waterproofing system and compatible perimeter components
• Replacement deck area, joist repairs and support improvements
• Insulation build-up and changes to falls or outlet positions
• Quantity of upstands, penetrations and restricted access details

Use our flat roof quote form to describe the building and symptoms. The specified flat roof work carries warranties on workmanship and materials, terms explained before work starts, with the chosen system and preparation clearly recorded.

Looking after it afterwards

Keep the outlet clear through appropriate maintenance and avoid storing pots, equipment or building materials on the membrane. Do not puncture the surface to attach cables or brackets. From a safe viewing position, look for changed drainage patterns, displaced edge trims or damage following other building work, and report these before moisture reaches the deck.