SIGA32-DMH-0134

SIGA 32

Project name: Duncan Macmillan House
Slate supplied: SIGA 32
Roofing contractor: NRA Roofing & Flooring Services

Opened in 1880 and extended in 1887, Duncan Macmillan House is the Headquarters of
the Nottinghamshire Healthcare NHS Foundation Trust. This Grade 2 listed building
required careful restoration to maintain its original visual appearance.

Around 90% of the roof needed replacement and due to the prestige and age of the
building, particular care was taken to replicate, as near as possible, the original roof
covering – in addition, it was vital to ensure high levels of quality were maintained.

From SIGA’s Specification Range, SIGA 32 (7mm) was selected. SIGA 32 is a high quality
slate that has similar characteristics to the original roof, and is backed by a 75 year
warranty. Furthermore, it is Snowdonia National Park approved, providing a cost effective
replacement within the constraints of a challenging restoration.

The project proved to have many complexities for the contractors. A key issue was
restricted access around the building. Major installation and removals had to be done
outside normal working/operational hours as this is a working hospital and the NHS Trust,
hospital functions and staff/patient welfare could not be affected during the renovation. To
ensure this was the case there was very close liaison between NHS personnel, the
contractors and construction consultants.

Multi-level elevations led to complicated access issues, particularly to the tower
sections which required the additional installation of hook and nail fixes for added
safety and reduced maintenance. In total, over 250,000 SIGA slates were used.
The refurbishment of this prestigious building has ensured the aesthetics and aura of
the building have remained. Moreover, the project has allowed an impressive local
building to keep its character and continue its purpose, under a secure roof, for many
years to come.

Wayne Mycroft from NRA Roofing & Flooring Services commented: “We found SIGA
32 to be a workable product with little or no problems encountered. The quality was
consistent throughout the contract and phases undertaken. The quality of the slate was
important and the warranty offered by SIG gave additional confidence with regard to
the product. The slates closely matched the original Welsh slates installed and
maintained the visual appearance of the building.”

David Pipes from the NHS added: “The new roofs have been well received by all in the
respective buildings. Despite the work being difficult to undertake whilst the buildings
remained occupied, the contractor has performed very well without significant problems
and complaint. The quality of workmanship and finished product is clear to see and the
design, using the materials specified, has improved the buildings performance and
reduced maintenance issues.”