Installation Instructions

36 SABIC Innovative Plastics
Flat Glazing sheet Thickness
oversized hole
purlin
expansion
allowance
32
In this situation, the major factor inuencing deection
behaviour is the purlin spacing.
The sheet width has no inuence on the deection
behaviour of the sheet when exposed to loading.
This means that any sheet width up to the maximum
standard width can be selected.
In the case of vertical glazing, should a greater span
width be required, a standard polycarbonate “H” prole
is sufcient to join two sheets together to form a sound,
water-tight joint. No additional vertical glazing support
bars are necessary.
In the case of sloped glazing, a support/glazing prole
is recommended to join two sheets together, not only
for a watertight joint, but also to avoid excessive sheet
deection already caused by the sheet’s own weight.
Fastening Lexan Thermoclear sheet to the intermediate
purlins using conventional nuts, bolts and washers is
possible. However, all joints and clamping areas require
support in the form of compatible rubber washers
to distribute the clamping force over as wide an area
as possible. To facilitate this, large metal washers
laminated with compatible rubber and assembled with
spacing collars should be used. Bolts should not be
tightened so that the force permanently deforms the
sheet or restricts its natural expansion and contraction.
An alternative method of assembly involves a specially
designed polyamide “cladding button” which is available
at any authorised Lexan Thermoclear sheet distributor.
The button is designed so that the compatible rubber
gasket is an integral part of the bolt which has a large
head to distribute the clamping forces.
When using any type of bolt assembly it is important to
remember that the spacing between the hole and the
sheet edge should be at least 40 mm.
Note
When applying the glazing method described above,
the following points must be taken into consideration.
• Penetration of water and dust between the “H” prole
and the sheet surface may create streaks.
By applying a recommended silicone sealant this
penetration can be restricted.
• It is extremely difcult to obtain a watertight
connection between the washer or button and the
Lexan Thermoclear sheet surface.
• Water and dust can easily penetrate into the bolted
sheet channel which consequently results in algae
growth or cobweb formation.
Consider this glazing system as suitable only when
appearance is of minor importance.
oversized hole
cladding button
expansion
allowance
min. 40 mm
33
max. stand width
Spacing
between
the purlins
34