Purpose

As part of our ongoing improvement programme,
it has been identified that the main pitched roof of the Leverstock
Green Village Shopping Precinct is beyond economic repair and
requires full replacement.
The existing roof, dating back to the early 1960s, is covered with
Marley Modern interlocking tiles. However, these are
first-generation Marley Modern tiles, which have become thin and
are showing significant signs of ageing and deterioration. Key
issues include:
Surface degradation: Concrete aggregate is visible through the
surface of many tiles, compromising their waterproofing
capabilities.
Damaged interlocking channels: At least 1 out of every 5 tiles have
broken interlocking channels, which are only visible once the tiles
are lifted. This damage allows water ingress.
Deteriorated underlay: The under-slating felt is old, brittle, and
particularly degraded at the eaves. It has sagged behind the fascia
board and no longer performs its intended function. Additionally,
the felt has only a 50mm lap, whereas a minimum of 75mm is
required.
Inadequate battens: The existing timber battens are undersized for
the weight of the Marley Modern tiles. They are untreated, have not
been tanalised, and have decayed significantly in several areas.
This has led to roof tiles slipping into the loft space and, in
some cases, posing a risk of falling externally—potentially
causing damage or injury.
Tenant complaints: The Council has received an increasing number of
complaints from tenants regarding roof leaks and draughts in the
loft space, particularly during periods of rainfall.
Capital funds have been allocated for the Leverstock Green roof
replacement, scheduled for the 2025–26 financial year.

Decision

To approve the contract award for the roof
replacement works at the Leverstock Green Village shopping precinct
to CWG Group Ltd.

Alternative options considered

As the roof at Leverstock Green Shopping
Precinct is beyond economic repair, capital funding has been
allocated for a full replacement.
Due to the contract value, the Council was required to undertake a
tender process. An open market tender exercise was chosen to engage
local contractors and encourage strong competition, ensuring value
for money.