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Glass Block Windows
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Q. I want security and
efficiency, so I might replace some old leaky windows with
glass blocks. I also want to use them for decorative interior
accents. Is this a good idea and are plastic ones as good?
A. New glass or plastic
block windows are easy to install and efficient. They are
more secure than standard windows against break- ins and the
insulation value of some surpasses standard double-pane windows.
"Glass block" window has become a
generic term for block windows made of glass or plastic. People
think block windows are solid when, in fact, the majority
are hollow.
Hollow blocks improve the efficiency just as
the air gap does for standard thermal windows. When the two
hollow glass block halves are fused together under high heat,
the air inside contracts as it cools to create a partial vacuum.
Acrylic block window halves are not fused under
high heat, so the insulating vacuum is not created. To improve
efficiency, some have a very thin invisible layer of metal
atoms on an inside surface.
Some block windows offer the option of ventilation
for efficient cooling and for egress during emergencies. One
option is using casement or hopper plastic block windows that
crank open. The plastic blocks are lightweight.
Another option is hinged hopper window panels
that replace several blocks in the center of a window.
Block windows function as natural shades to
block the intense sun's rays during the summer. When the sun
shines down from a steep angle at midday, the horizontal mortar
or tinted sealant joints become a louvered shade.
There are several options for installing block
windows. The simplest method is to buy complete glass or plastic
block windows that install similar to any replacement window.
Several installation kits are available to
stabilize and space the blocks. One method uses hidden spacers
between the corners of adjacent blocks. Another kit uses tracks
and clear sealant between the blocks.
These kits include everything needed and are
ideal for the inexperienced do-it-yourselfer.
Interior decorative block walls allow natural
light to pass through them, yet still provide privacy. An
attractive touch is to install efficient fiber optic lighting
in the joints.
Source: Chicago Sun - Times
Publish Date: 2003-09-28
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