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Project Archive...
Welcome to the NDM Project Archive - here you can
access information on some of our past projects.
(Click on the pictures to open a new
page with more information.)
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Ashmolean Museum
NDM's design
team were given a brief by the Architect to create an aesthetic
and smooth appearance for the zinc, all the welts and seams
should be equalised and regulatory as possible. We produced
drawings with specific setting out details and these were
followed precisely by our site team. |
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Finsbury Circus
Working from the
architects original drawings NDM were able to put forward all
the designs and details required to both create the finished
look of the project whilst adhering to the specifications for
heat loss and wind load. The plant screen substrate was a steel
purling and tac-tray system especially coated to exceed the site
specifications for weather resistance. |
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Hardwicks Way
The tower is clad
in Sky Blue coloured Zinc. The Tower provided the most challenge
with design as there are many decorative elements to the work. A
feature band has been incorporated which wraps around the
building on every floor. There is also a Quartz (grey
coloured) zinc column extending from the ground to the very top
floor of the tower, which interfaces with both the glazed
curtain walling and the Sky Blue coloured zinc.
All terraces to the
tower are clad in Quartz Zinc. |
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Lambeth College
The substrate
consists of Metsec purlings between the existing concrete slabs.
6" x 2" timbers are secured to the metsec using oversized steel
brackets. Insulation is installed between the timbers and is
covered by a breathable membrane.
2" x 2" counter
battens are then installed and followed by 4" x 1" timber
boards.
The zinc cladding
is then fixed to the timber boards using patent clips and 25mm
stainless steel nails.
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Stratton House
NDM were contracted
to produce and install various zinc cladding and weathering
systems and associated substrate to the external elevations of
the building. An angled plant screen was also constructed using
steel box-section posts (also provided by NDM) and clad in zinc.
Our package also includes weathering to all risers and plant
housings on the roof and the fabrication and installation of a
maintenance walkway on various levels of the rear elevation. |
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Gresham Street
NDM were responsible for the whole roof and
mansard areas. This includes all Copper, Lead, Slate and Euroseam
roofing components and their respective substrates.
Of special note on this project
is the striking copper dome.
Copper was also used extensively
to weather in the dormers. |
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Other Projects of Note:
Kinnaird House,
Tower of London |
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Kinnaird House, Pall Mall
Overview:
The highly acclaimed project carried out by NDM Lead Sheet
Specialists at Kinnaird House in Pall Mall, London, received the
ultimate Lead work accolade by winning the 2001 Murdoch Award.
In presenting the Award to NDM Directors Nigel Miles and Brian
Shepherd, Richard Murdoch paid tribute to the consistently high
standard of workmanship demonstrated throughout the project,
which was a credit not only to NDM and their craftsmen, but to
the industry as a whole. He considered it a superb demonstration
of what could be achieved in the Lead work craft and wonderful
advertisement for the LCA.
The work:
The original façade of Kinnaird House was preserved whilst the
internal building was demolished and replaced with a new steel
frame and concrete slabs. A new mansard roof was constructed by
NDM at 5th, 6th and Plant Room levels, complete with Canadian
Vermont green slate and including the lead cladding of 55 dormer
windows of various types and sizes.
On the 5th floor there was a mixture of pitched and curved tops
and on the 6th a more traditional flat roof arrangement. Each of
the four corners of the building had identical traditionally
slated turrets with four pitched lead clad dormers on each, plus
decorative fluted hip and ridge capping with emblazoned cast
decorative ribbons at specified centres. Each side of the
dormers were large lead clad scrolled consol brackets.
The slated Plant Room elevations had extensive copings at high
level above the finished line of the slates and a scrolled ridge
capping with emblazoned ribbon, similar to the turrets.
The outstanding centre piece of the roof-scape was a three
tiered cupola that had to be completely rebuilt as an exact
replica of the original design.
Altogether, some 120 tonnes of Code 5 rolled lead sheet (and
approximately 1,000 M2 of random slate) were used on the project
which took six months to complete.
This was the second time that NDM had won the Murdoch Award,
having previously been honoured for their work at the new
education block at Canterbury Cathedral in 1999.
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The Wakefield
Tower at the Tower of London
Overview:
This prestigious project was completed by NDM Lead Sheet
Specialists during the first six months of 2004. The
installation was carried out to a strict design specification
and completed in 12 weeks, using approximately 18 tons of Code 6
and Code 8 sand cast lead sheet.
Historic Royal Palaces made the decision to restore the Tower to
its 13th Century appearance, which would include replacing the
existing asphalt roof with something that was, in both
appearance and methods of construction, to the original design.
The architects were able to base their final design on some
original Victorian drawings that they were able to source.
The work:
The main circular roof was to take on the appearance of a
‘Witch’s Hat’ when viewed from above. This was to be divided (on
section) into three levels, with a stepped perimeter box gutter.
The lower and middle layers consisted of 48 bays per layer, with
the top layer consisting of 24 bays. On top of the final level,
a removable but fully weathered cover was required for the
Winching system that controlled the lowering of the chandelier
in the main room below. The cover to the chandelier winch was
made up of 8 bays.
In pursuit of traditionalism and to virtually eliminate hot
works and their associated risks, all lead details were to be
bossed, rather than welded. This turned a manageable design into
a test of any lead workers skill and only a true specialist
would be able to take on such a challenge!
The build process:
The work began with the installation of the main timbers that
would support the new substrate. A number of 175mm x 50mm
rafters were fitted between the walls of the tower and the
centre of the roof area, which created a base for the rest of
substrate. Additional rafters were latticed between these main
beams to create a solid base for the 100mm x 25mm and 150mm x
25mm timber boards (3mm gap for ventilation). When this
substrate base was complete, a three-tiered solid roof had been
created and then bespoke sized batten wood rolls were fixed down
to create the bay sizes, as per the architect’s design.
A box gutter (with two outlets) was then formed in sawn &
treated timber, which was fed from the lowest tier of the
witch’s hat. This was stepped every 2.7m (maximum) by a minimum
of 100mm to ensure the lead work complied with BS6915.
Lead works began with the installation of Code 8 sand cast lead
to the box gutter. The flashing to the box gutter was again sand
cast, only in Code 6. However due to the age of the stones, they
couldn’t be in any way modified for the installation of the
flashing. The lead needed to be installed in the mortar only,
which meant that the flashing had to be shaped and installed to
follow the mortar lines around the stone. The flashing was
installed to maximum lengths of 1200mm between laps. Each
semi-triangular bay for the main roof was individually formed on
site and installed in accordance with the Code of Practice. This
included an up-stand of 100mm between levels, and a splash lap
of 75mm to the front of the bay, offering a total weathering of
175mm. All bays were close nailed. |
NDM is a member of all the above
trade organisations. |
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