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A sprung cured roof can be concave or convex,
a combination of concave and convex, or a combination
of straight and curved as long as it’s within
the practical limitations of the steel.
Sprung curved roofing is the process of free forming
the roof sheet over the contours of the roof frames,
progressively fixing the individual sheets to the battens
(or purlins). The finished curved form being totally
dependant on the correct alignment of the batten fixing
points of the roof framing – much like stretching
modern camping tents over the correctly positioned tent
frame struts.
The main advantage of sprung curved roofs is that standard
corrugated steel sheets made from COLORBOND® and
ZINCALUME® steel can be used- delivered to the building
site in straight flat sheets. Consequently sprung curved
steel roof sheeting in this regard is no more costly.
In designing a sprung curved roof it is important to
work within the curving range of the steel. For standard
corrugated sheeting made from COLORBOND® and ZINCALUME®
steel, concave curve must have a radius of no lower
than 12m and a convex roof of a radius of no lower than
10m.
As a result, of these design parameters the sprung curved
technique lends itself to soft sweeping curves.
For tighter convex or concave radi, sprung curving cannot
be used, rather, factory pre-formed curved corrugated
sheeting must be used. It is important to note that
curved roofs do require a different approach to roof
frame construction than that of normal pitched roofs
and that any extra cost differential can be minimised
through having correct information at the design stage.
Several steel roofing suppliers have produced comprehensive
guides to installation of curved roofs covering various
aspects of installation and design principals. There
are also other roof deck profiles, than the standard
corrugated shape, which have different curving abilities
- steel roofing suppliers will also be able to assist
in providing this information.
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