Palram PALGAR - Manual (Page 16)

PALSUN® PALGARD™
Glazing Guide
16
2) “DRY” METHOD: Uses only “mechanical” means, such as
various profiles & bars, of wood, PVC but mainly metal ones, including
simple flat, bent, RHS profiles in regular steel or aluminum, or
specifically designated regular & stainless steel or aluminum profiles, with
specially made sealing strips & gaskets.
The method does not rely on chemical bonding or sealing of adhesive
pastes and compounds of any kind. Connections, fastening and sealing are
done by various types of fasteners or specially designed mechanical profiles with
details enabling connections of elements by special tongue &
groove design, material springiness and flexibility etc.
Impermeability & sealing are arrived at by careful design &
appropriate materials used, both of the rigid frame profiles
and resilient rubber gaskets of many types.
Professional design circles believe “Dry” method is “cleaner” &
more elegant in appearance, operates better (when designed
well), more durable and longer lasting than its “wet”
counterpart.
It also enables certain large-scale design options impossible or awkward
to execute in “wet” systems.
Basic idea of a “dry” glazing system, either vertical or sloped (“horizontal”)
is laying the glazing pane on a springy EPDM rubber or similar compatible
glazing strip attached to the supporting frame along the
window sash, usually on four sides, and clamp it with
appropriate glazing bars or profiles, also equipped with suitable
sealing strips, so those clamps tighten the glazing fully on all its
perimeter, with the external gaskets squeezed tight to the glazing,
sealing it against water & dirt infiltrating.
The system should be designed so that should some water succeed
to penetrate this first defense line they should accumulate and drain
downward through internal channels in the frame (second defense
line), and should not reach the internal glazing gaskets (last defense).
This is especially important in skylights & sloped roofing, where
rainwater stands more chance of accumulating & infiltrating.
Similar glazing systems exist for glass skylights & curtain-walls, all around
the world, and a few could also be used for limited thickness & spacing
solid polycarbonate glazing. The main requirement of any optional profile
series selected is deep enough window sash which enables at least15 to
20mm edge engagement depth plus 2-3mm gap for thermal expansion
each side.
Figure 6. Typical Glazing with Heavy
Duty Steel & Aluminum Profiles &
Designated EPDM rubber Glazing
Figure 4. Typical Glazing
with Simple RHS Steel
Profiles & Designated
EPDM rubber Glazing Strips
Figure 5. Typical Glazing with Combined
Wood & Aluminum Profiles and
Designated EPDM rubber Glazing Strips
Figure 8. Existing Aluminum & Glass Sloping
Skylight system Optional for PALSUN Glazing
of Limited Dimensions
Figure 7. Existing Curtain Wall Aluminum
& Glass System Optional for PALSUN
Glazing of Limited Dimensions