Project1_Layout 1 07/05/2013 PROJECT FOCUS
SIG stops the leaks at
SIG Design & Technology employed its in-depth knowledge to help secure condition improvement funding for 1,100 m² of essential roof repairs at
The West Yorkshire academy had
previously made a number of
unsuccessful applications for CIF
funding. However, the situation changed
after the academy contacted SIG Design
& Technology (D&T), who partnered with built
asset design and consultancy firm Arcadis LLP to
develop and submit the successful funding bid for
At Lightcliffe, SIG undertook a conditional roof
survey for the whole school, advised on the life
expectancy of the existing roof coverings, made
recommendations on actions required to extend
the serviceable life of the coverings, and formed a
strategic plan to renew all roofs.
SIG D&T offered its accredited contractors
(DATACs) extra support to help them win work,
on any projects over 500 m². For such projects,
including school roofs, SIG D&T will produce
a Bid Support Pack, which the contractor
can present to their client when bidding for a
project. The pack will contain the specification
required for the project, including its design and
Nature of academic buildings
Like many academic buildings, Lightcliffe
Academy consists of a multitude of interconnected
buildings which have expanded over the years.
Most of the roofs are flat and all present different
designs and build-ups.
The original design and the build date back
50-60 years and water ingress of the roofing system
062 JUNE 2018 RCIMAG.COM
continued on page 64 >>>
Lightcliffe Academy in Halifax
BBA accreditation for SIG SIGnature
25 waterproofing system
SIG’s SIGnature 25 roof waterproofing
system has been awarded the British Board
of Agrément certification.
The quality accreditation is for
SIG’s own range of Torch-On roofing
bituminous membranes. These comprise
polymer-modified bitumen waterproofing
membranes, insulation boards and a vapour
control layer for use on flat and pitched roofs
with limited access.
Suitable for warm or cold roofs, the
SIGnature Torch-On range is available in
three underlay options, with the potential for
either 20 or 25-year warranties.
and interstitial condensation had created persistent
problems. SIG inspected all 11 roofs and carried
out a process to grade them. Some roofs were built
on metal decks, while others were timber.
The surveyors found that some of the roofs
had no insulation at all, contributing to significant
heat loss in winter, and a risk of condensation
issues. Some roof coverings had been repaired or
over-roofed with new membranes, but several had
reached their “end of useful life”.
At Lightcliffe, water drainage was a key factor.
Many of the gutters between the roofs were also at
the end of their serviceable life, some having been
repaired with emergency paint-on products. SIG
recommended a new warm roof bespoke tapered
insulation system, using the SIGnature Bituminous
Torch-On range of membranes. Insulation was
provided with a U-value of 0.18 W/m2K.
School’s out for summer
Maintenance was planned over the school summer
holidays. The programme included critical work on
the roofs of two classrooms, the hall, dining room
and kitchen roof and boiler house roof.
Leaks were worst in the multi-purpose academy
hall which had a gutter over a large beam. It is
used as a dining hall and water was entering the
building right above the area where pupils eat,
tracking along the beam and dripping onto the
floor, damaging the timber flooring and was being
collected in buckets.
During the survey, the inspection team took
core samples from areas of the roof to identify
the build-up and type of deck, confirming the
condition of the materials and identifying which