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Building Products
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Engineering Products
Metsec plc
Broadwell Road
Oldbury
West Midlands
B69 4HF
T: +44 (0) 121 601 6000
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Lightweight roof beams up to 40m span
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Metsec lattice roof beams or roof trusses can offer the ideal solution for supporting
a wide variety of roofing systems due to their excellent strength to weight ratio.
Typically a Metsec lattice roof beam can weigh up to 50% less than its hot rolled steel beam
counterpart and yet still achieve spans of up to 40m without the need for intermediate
support columns – which can allow designers greater flexibility when working
to optimise internal space.
Internal space can also be optimised by passing services through the web of the
lattice steel beam rather than having to suspend them underneath causing a significant loss
of headroom.
Similarly their aesthetic properties mean that they can be supplied painted and
left exposed as part of a ‘feature’ internal roof structure.
In addition to the direct reduction of the environmental footprint of a construction
project by virtue of their lighter weight, lattice beams can also help to reduce
the environmental footprint of the project by using off-site fabrication to speed
up the construction process. The lighter steel beam or steel truss sections can generally be
transported and handled more efficiently on site.
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Pitched and curved roofing
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Curved roof truss with structural deck
Metsec curved roof trusses can be used to support structural decks with a suspended ceiling.
The natural open web of the steel truss allows for the simple passage of services.
 FREE Beam Design Service
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Parallel roof beam laid to fall
Metsec parallel roof beams can be used to support Z-purlins bolted to cleats pre-welded
to the top chord of the steel beam. Liner tray insulation and metal deck provide the weather-proof
layer and are fixed to the Z-purlins.
FREE Beam Design Service
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Pitched roof truss with flush-fitting
Z-purlins
Metsec pitched roof trusses can be used with a cold rolled steel framework and Z-purlins.
This allows Metsec to offer a unique one stop solution. Metsec Z-purlins can also
be used flush fitted to the steel truss to minimise the overall construction depth of the roof.
FREE Beam Design Service
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Traditional roof systems
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Parallel roof beam used as purlin
Metsec parallel roof beams can be used as long span lattice purlins supported on load bearing
masonry walls. In this application timber firrings are fixed directly to flush fitting
timber inserts in the top chord of the steel beam. Timber roof rafters are then fixed
to the timber firrings to support counter battens, underlay, tiling battens and
tile or slates.
FREE Beam Design Service
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Pitched roof truss used to support timber purlins
Traditional timber purlins can be supported on a Metsec pitched roof truss. Ply or similar
sheathing is then used to support weatherproofing layers of battens, underlay and
roof tiles or slates.
FREE Beam Design Service
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Green roof systems
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Parallel roof beams used to support
steel decking with green roof surfacing
Metsec parallel steel beams can be used to support a structural deck, membrane, substrate
and Sedum roof.
These lattice roof beams can be up to 50% lighter than hot rolled steel beams and use far less steel
with considerably less environmental impact than other systems.
FREE Beam Design Service
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Over-roof system
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Where existing flat roofs are starting to fail or require
upgrading, one option to consider is the creation of a new pitched steel truss, or curved steel truss, over-roof
which can be constructed quickly and cost effectively using Metsec lattice trusses.
The lightweight lattice beam over-roofing system avoids the need to strengthen the existing
roof structure and can give an existing building a much needed facelift - typically
at a fraction of new build costs.
The new roof trusses can be spaced at much wider centres than other over-roof systems,
which results in fewer penetrations and fixings into the existing structure.
The new lattice roof trusses are installed to span across the building and provide a
range of benefits for the building owner, including improved water run-off and enhanced
building insulation. The additional space created under the new structure can also
be used to house building services making usable space available elsewhere in the
structure.
The Metsec lattice team have gained considerable expertise in the design of roof trusses
for use in over-roofing projects both large and small.
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Further information
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