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why use galvanised steel roof purlins

Galvanised steel roof purlins are a major part any type of steel framed building and are generally manufactured from high tensile steel and roll formed into a particular shape,
roof purlins can be either cee purlins, zed purlins or zeta shaped purlins, all these steel sections can be used as side wall purlins or cladding rails, they are all very strong for their
weight and different shaped roof purlins all have different structural properties. these are a mathematical equation of the shape and strength of the steel
a structural engineer will use the structural properties and work out what size roof purlins or what type of roof purlins you may need to satisfy any roofing support condition.
years ago the main type of roof purlins was either timber purlins or hot rolled steel angle, these are still used to day but not in a big way as timber purlins have to be treated
for all sorts of complications like wood rot an insect infestation where as the hot rolled steel angle roof purlins are too simply heavy to handle and are difficult to fix materials to
or drill into to.
cold rolled steel roof purlins became pretty much standard almost 30 years ago and have changed little in shape from the zed and cee shapes, what has changed is the tensile
strength of the steel used in the forming of roofing purlins or cladding rails, tensile strengths such as z29,z35 z39 and now as of 2011 z45 seems now to be standard.
Though most purlin manufacturers have upgraded to the z45 steel they have reduced the size of the purlin section so offsets some of the benefits, one reason a manufacturer
of roof purlins reduce the purlin section size is that the z45 steel is more expensive than say the z39 so reducing the top and bottom flange on the purlins is a way of counteracting
that cost increase
we manufacture several roof purlins of different heights ,the roof purlins can also be of a different thickness, this is to suit various construction details in different
environments or situations, for example a 200mm deep roof purlin at 1.4 mm thick may be to big for a construction detail so you may want to use a 150mm deep roof purlin at say
2.2mm thick this phisical change in the roof purlin might be say 50mm in height but the strength of the roof purlin remains the same since the thickness of the roof purlin has increased,
it is because of this flexibility that cold rolled roof purlins have been so successful and are now used through out the world in all kinds of construction

roof purlins