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Live Project

Arron Court — Roof Renewal

Renewal of four pitched roofs to an occupied residential block, with Sika liquid-applied systems to the dome dormers, box valleys and flat valley section. Works in progress.

ProjectArron Court roof renewal
BuildingOccupied residential block
ScopeFour pitched roofs, Sika liquid-applied details, rainwater goods
StatusLive — works in progress

The Approach

Four pitched roof slopes are being renewed across the block, but the pitched areas are the straightforward part. What determines whether a roof like this stops leaking is the detailing around everything that interrupts it — a run of barrel-vaulted dome dormers, box valleys between the slopes, a flat valley section and the copings along the parapets.

Those details are being formed in Sika liquid-applied systems rather than sheet materials. A liquid system is cold-applied and seamless, so it can be taken continuously around the curved dormer roofs and into the valleys and upstands without the joints, welds or laps that are usually where a roof of this shape starts to fail.

The Detail

Dome Dormers

The barrel-vaulted dormer roofs recovered in a Sika liquid-applied system — seamless over the curve, with no laps or welded joints on the most exposed part of the roof.

Valleys & Copings

Box valleys, the flat valley section and the parapet copings all completed in Sika products, giving a continuous membrane through the details that collect the most water.

Eaves & Drainage

Full renewal of the rainwater goods, so the new roof discharges into new gutters and downpipes rather than into whatever survived the last one.

Renewal of the Velux rooflights is being carried out by others; our works are programmed around that so the roof is closed up in the right sequence.

Scope of Works

Pre-Start Survey

Recorded Condition

Existing box valley and rainwater goods recorded before works
01 Existing valley and rainwater goods as found — debris, standing water and a gutter line at the end of its life.
Barrel-vaulted dome dormer recorded before recovering
02 One of the dome dormers, to be recovered in a Sika liquid-applied system.
Pair of dome dormers on the pitched roof slope
03 The dormers sit proud of the slope on every elevation — the most exposed detail on the roof.
Pitched roof slope with vent terminals recorded before works
04 One of the four pitched slopes, with vent terminals and abutments to be re-detailed.
Roofscape across the block before works
05 The roofscape as a whole, showing how the slopes, valleys and dormers meet.
Run of dormers along the roof slope
06 The run of dormers along the elevation, each needing continuous cover over the curve.
On Site

Access and Encapsulation

Scaffold and sheeting to the front elevation of the block
07 Scaffold and sheeting to the elevation, with resident access maintained beneath.
Dormer beneath the temporary roof structure
08 Working beneath a temporary roof keeps the block weathertight through the strip.
Dormer and roof slope detail recorded at pre-start
09 Every dormer, valley and abutment recorded at pre-start before works begin.
Roof slope with access from the scaffold lift
10 Full access to all four slopes from the scaffold, with the block occupied throughout.

Progress and completion photography to follow as the works proceed.

Roofing and Liquid-Applied Systems

Pitched roof renewal, liquid-applied waterproofing to complex details, and planned roofing programmes for housing providers and managing agents.

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