Consisting of a
series of octagons, the 4,250m2 flat
roof of Unit 800 at Aztec West is not only one of the most complex roofs in
Bristol it is also one of the most securely guaranteed after being re-roofed
with a BMI Icopal’s Torch-on system.
Built approximately
27 years ago for the then owners South Western Electricity Board, Unit 800 is a
multi-level office block offering nearly 7,000m2 of office space for rent over the three floors.
The office block is
now owned by Regional REIT and managed by London & Scottish Property
Asset Management, which spent £6.5 million on a Category A refurbishment that
was project managed by Trident Building Consultancy.
“The existing roof
had reached the end of its useable life and required full replacement to
provide a good quality waterproof covering as well as meet current Building
Regulations” says Andrew Hill, Associate Director at Trident.
“We were looking for
a good quality high performance felt system with a long guarantee. BMI met this
requirement with its 20-year product guarantee, good range of high performance
felt products and its long-established reputation in the market.”
Andrew added he
preferred a high performance felt membrane on this occasion due to the
hardwearing nature of felt because the roofs will be regularly accessed for
maintenance.
Installed by Mitie
Tilley Roofing, the new roof consists of BMI Icopal Total Torch Vapour Control
Layer, 120mm BMI Thermazone Torch-on Roof Insulation Boards in the majority of
areas and tapered insulation for the remainder, Total Torch Vapour Dispersion
Layer and charcoal Thermaweld FireSmart Mineral Capsheet.
“The technical
support from BMI is always excellent,” says Matthew Goddard, Area Director,
Roofing. “Tapered insulation was designed and detailed by BMI to create falls
in the areas of the building that had flat decking, with sumps to the perimeter
to keep ponding water to a minimum. Regular inspection visits by the BMI
technician ensured that any difficult details were overcome quickly and
effectively, ensuring a very high standard of work.”
Suitable for both
new and refurbishment projects, BMI Icopal Total Torch Vapour Control Layer is
installed beneath the insulation – controlling the passage of internal water
vapour through the roof structure and acting as a weatherproof temporary finish
before the final waterproofing system is applied.
Easy to handle, cut
and install, BMI Icopal Thermazone Torch-on Roof Insulation Boards combine
excellent thermal performance with dimensional stability and high compressive
strength, while BMI Icopal Total Torch Vapour Dispersion Layer stops the
blistering created by the build-up of water vapour pressure within the roof
construction.
Shielding the roof
from both spread of flame and fire penetration, Thermaweld FireSmart Torch-on
capsheets are 30% faster to apply than traditional torch-on membranes and their
mineral surface provides a decorative and solar reflective finish for the built-up
waterproofing system.
Together these
components construct a tough, premium roof that withstands weather and foot
traffic and, when installed to BMI’s specification and by a Team
Icopal-approved contractor, like Mitie Tilley Roofing, qualifies for a
comprehensive, insured guarantee cover of up to 20 years.
