|
Panel End Lap
When a lap is required the ends of the
panel are notched and pre-punched in the
factory to ensure the best possible basis
for the site formed joint. The 100mm
overlap is used to ensure maximum joint
integrity when used on low roof pitches.
The underlapping panel incorporates a
steel plate under the surface of the outer
skin to enable the joint to be formed
without the fasteners fully penetrating the
panel. The overlapping panel is prepunched
to allow precise location of the
fasteners through the sealant close to the
panel edge.
Fixing to Support Steelwork
The panels are secured to the support
steelwork by means of self-drilling, selftapping
screws.
Depending upon the anticipated design
wind loading to be applied to the panels,
either one or two fixings may be required
to each side of the panel at every purlin.
The application of two fixings is not
considered practical when the flange of the
support purlin is less than 50mm wide.
Panel Side Joint
The panel side joint features a compressible
seal full height of the panel edge. The
through fixing screws secure the panel to
the support purlin and are in turn concealed
by the snap cap. Where specified, the
joint can be site sealed at the inner skin
of the panel using a butyl sealant. This
type of seal is normally used in conditions
of high humidity. Panel module and good
joint compression are essential; fixing
clamps DRT1 should be used during the
site assembly.
|
