The components which make up this structural system are:
 Purlings:
This is the profile which comprises the framework the roof is fixed to.
C-
or Z-section, cold-formed, galvanised
steel profiles are used.
The purlings are fixed to the rest of the structure with
calibrated bolts.
Frames.
Front
ends or lintels.
Bracing.
Anchorage.
Roof.
Skylights.
Gutters.
Heat
insulation.
False ceiling.
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