For proper point fastening,
1" neoprene bonded washers should be used with screws.
48 inch wide sheets: Should be
fastened to supports at all four corners , and at points 6" in from the edges of
each purlin support.
72 inch wide sheets: Should be
fastened to supports at all four corners, and at points 6" in from the edges of
each purlin support and in the center of the purlin supports.
Allow for thermal expansion
during installation at a rate of 1/8" per 3 feet at 100 temperature
differentials in both width and length of the sheet. Bronze panels will require
an additional 30% space.
Twinwall is one of the highest
impact resistant materials available. From transport to installation, Twinwall
will maintain its durability. Even when exposed to elevated temperatures over a
long period of time, it will maintain its structural integrity. On-site, it will
not crack or splinter, assuring you a high degree of safety.
Extruded ribs shall be installed in a
vertical direction for drainage. Glazing sheets should be joined by
extruded polycarbonate profiles and be
installed with their protective U.V.
stabilized surface towards the exterior. Twinwall should not be used with PVC
profiles, however, a variety of aluminum systems may be used. Consult with your
local Distributor for approved systems.
The use of horizontal bars should
be avoided. Instead, order Twinwall in the proper length
(up to 39 ft.)
For proper application of Twinwall in roofing conditions, a slope of at
least 5 degrees
Stiff fixing by means of adhesive
or putty is to be avoided. Contact your distributor for recommended sealants.
Exposed top and bottom ends of a
sheet must always be sealed by means of the proper polycarbonate "U" profiles or
an adhesive aluminum tape to prevent dust and dirt penetrating inside the ribs.
panels can be readily cold formed to many bending radii and can be fabricated on
site to precise dimensions. It is important to avoid over tensing of the sheet,
therefore, the minimum bending radius must be 150 times the thickness of the
panel. Minimum Bending Radius = Ft./1
|Min. Bend Radius
This diagram is valid only when following
conditions are followed:
Correct calculation of expansion in order to
provide for the necessary allowance in the framing. The thermal expansion co
efficient is 0.0000375 in/inF.
Where possible install the sheets with the
ribs running vertically and following bending in bent applications.
Washers and sealing materials must be
compatible with polycarbonate.