What is Samco Curtain Wall system?
Samco LTD. curtain wall system is a lightweight exterior
cladding which is hung on the building structure , usually
from floor to floor. It can provide a variety of exterior
appearances but is characterized by narrowly spaced vertical
and horizontal caps with glass or metal infil panels. Samco
LTD. systems provide a finished exterior appearance and
most often a semi-finished interior as well. They are also
designed to accommodate structural deflections , control
wind- driven rain and air leakage, minimize the effects
of solar radiation and provide for maintenance - free long
performance. Since Samco LTD. curtain wall systems are a
good example of building science principles applied to wall
design , it may be useful to review some basic principles
through the details of a typical Samco LTD. curtain wall
Samco curtain wall system design Principles
for Exterior Walls
A building enclosure may be broadly defined as a set of
interconnecting elements which separate the outside from
the inside. These elements would include exterior walls,
a roof, other components such as windows and doors, and
sometimes exposed floors. The function of a building enclosure
is to control the penetration of snow, wind, rain and
sun to the inside and to contain the desired indoor climate.
The enclosure must meet many individual requirements
but for the purpose of this paper they are limited to the
|1 - control of air flow .
2 - control of heat flow .
3 - control over the entry of rain and snow .
4 - control of sunlight and other forms of radiant energy
5 - control of water vapour diffusion .
6 - accommodation of building movements .
The requirement for air tightness
and consequently air leakage control is met by Samco
LTD. curtain wall systems
because the air barrier of the wall is inherent in
the structural properties of glass and aluminum or
steel tubes that
comprise the system. The continuity of the air barrier
(Figure 1) is achieved by the continuity of the glass
panel through the air seal at the shoulder flanges
of the tubular mullion , and through the aluminum
section to the other flange surface.
The air seal between the lower shoulder
flange of Samco LTD. curtain wall mullion and the
metal pan of the spandrel panel provides continuity
of air tightness to the air barrier metal pan and
on to the next mullion connection. Such assemblies
are regularly tested using air pressure to determine
the structural properties of the glass , metal , and
and to determine the equivalent leakage area ( ELA
) that remains.
||Samco curtain wall
thermal Insulation (Control of heat flow)
Samco LTD . curtain wall systems control of heat flow
is generally achieved through the use of insulation
. Although it isnot apparent from the exterior, the
curtain wall system uses considerable insulation usually
behind spandrel glass or anyopaque panels. Because of
the materials used in the structure, i.e., glass and
metal, which are highly conductive, SamcoLTD. system
must also contend with potential condensation on the
interior surfaces . To curtail this effect, Samco LTD.curtain
wall systems incorporate two distinct features : first
, a sealed double glazed window or an insulated metal
panand second , a thermally broken mullion , usually
with a PVC plastic insert and more recently , a foamed
- in - place polyurethane connection.A sealed double
glazed window unit can accommodate an indoor humidity
up to about 35% at an outdoor temperature of - 25 °
C with little condensation appearing on the glass .
Similarly, Samco LTD . thermal break an outdoor temperature
of - 25 ° C with little condensation appearing on
the glass .
Samco LTD . thermal break system in the aluminum or steel
mullion ensures that the surface temperature of the structural
mullion will remain well above the dew point temperature
of the air for most building types, except for high humidity
indoor environments such asin swimming pools or computer
centers . Samco LTD . thermal break system also ensures
that the structural mullion is thermally stable , that is
, not subject to extremes of expansion and contraction.
The "Rain Screen"
Principle(Control of rain and drain water)
Samco LTD. Studies
of the rain penetration problem have revealed a better solution
than the façade sealing approach . If the air that
leaks in and through cracks and crevices of a façade
during a rain storm were limited or stopped,most of the
water impinging on the façade would migrate straight
down the surface and little would penetrate the wall. This
is the essence of the " Rain Screen " principle
. If an airtight element is positioned behind a façade,
the cavity formed between the exterior cladding and the
airtight element may reach the same air pressure level as
is exerted on the cladding surface , thus removing the force
which causes air to flow through any façade opening.
The " Rain Screen Wall " is therefore characterized
by a cavity behind the exterior surface that is connected
to the exterior but sealed tightly, or as tightly as reasonably
possible, to the interior. The inner surface of the chamber
is usually referred to as the air barrier of the wall.