Palram PALGAR - Manual (Page 25)

PALSUN® PALGARD™
Glazing Guide
25
Figure 14. Typical
Partial Frame, 3
Sides Clamped
Glazing in a Sound
Figure 16. Typical Heavy-Duty Pressure
Distributing Bar Clamped Glazing, with
Bolts Fastening, in a Sound Barrier
Figure 15. Basic Screw Fastening with
Separate washers. Under the Glazing a
Thin EPDM Strip Padding
Figure 17. High-End, Heavy-Duty Aluminum
Sub-Frame with Separate Bolts & Washers
Fastened Glazing in a Variable Slope, Very
Shallow in Parts, New Olympic Stadium Roof,
Athens 2004 (Left)
c. PALSUN® Installation in a Partial Frame:
PALSUN could be installed clamped on three sides and frameless
on the fourth (generally top), and even clamped on two sides only.
This situation requires a thicker, more rigid glazing pane than that
installed in a full frame. Rate of thickness increase is to be
determined along 2 parameters: glazing size (particularly width)
and maximal anticipated wind-loads. Such a method is usually
used in vertical installations, many times in sound barriers.
d. Fastening PALSUN® with Bolts, Screws or Rivets:
A possible option, even if not truly recommended.
Installed in or on a supporting frame with bolts/screws through
pre-drilled oversize holes in the PALSUN sheet.
1) Holes would be 2mm larger in diameter than bolt or screw
used, to enable thermal expansion.
2) Each bolt/screw would be equipped with a Ø 30-40mm rigid
metal (stainless/aluminum) washer, with a compatible
shaped soft EPDM gasket under the bolt head, on top side of
the glazing, to distribute the bolt’s pressure and pad the
fastener’s surrounding. (fig.15)
3) Tightening should be controlled & carefully executed, avoiding
excess local pressure on the glazing and distortion of the
gasket. Under no circumstances would an impact wrench be
used for the job.
4) A minimal distance of 2.5 times bolt/screw diameter, from glazing
edge to nearest hole edge, would be maintained, never less than
12mm.
5) Bolt fastening with pressure distribution clamping
bars, with compatible EPDM strip should be
preferred over fastening with separate oversize
washers. (Fig.16)
6) Fastening with bolts/screws would be selected,
mostly, in projects where sheer strength of
fastening has an obvious preference over
appearance, or when full length clamping profiles
may interfere with proper rainwater drainage
(shallow angled overhead skylights or roof glazing.
Fig. 17).