Volume 36, Issue 3, March 2001
Eliminating the Internal Sealant for a Worry-Free Cutainwall Installation
The most common problems glaziers encounter when working with conventional
pressure-equalized curtainwall systems are found internally. These include unsealed or
poorly-sealed end dams, pressure plates that dont have the proper torque on the
fasteners or interior gaskets that are cut short or not sealed properly.
Any breakdown of a curtainwall interior seal can create a void to the interior of the
building that keeps the system from proper equalization. This will not allow the system to
weep, and unwanted air and water can enter the building. All of these problems can be
time-consuming and labor-intensive to repair. They can also be avoided by installing our
Series 5800 curtainwall system. Following are instructions, to aid companies in the
installation of this system.
The 5800 curtainwall system structural silicone gasket is a fabricated, flexible
continuous frame with molded corners. These gaskets provide retention and front
weather-sealing of all infill components. The gasket, which will last the lifetime of the
building, can be installed in any weather, and is ideal for new construction or
replacement of deteriorating zipper gaskets.
The 5800 curtainwall can be installed and removed easily. It is designed so the exterior
gasket engagement dart interlocks within the aluminum extrusion. This design helps
minimize under- or over-compression of the gasketbut visual inspection indicates
easily if any corrections are necessary.
The glazing tools used are a dead-blow hammer, a deglazing tool for the removal of the
gasket and a liquid spray bottle for lubricant application. The individually-packed
gaskets will arrive on site with an identification number that identifies the gasket frame
location on each elevation. Remove the gaskets from the polyethylene bag just prior to
glazing. This will help prevent placing a gasket in the wrong location.
The horizontal mullions are designed to be notched over the vertical mullions and are
attached by two tech screws. The vertical mullions are anchored the same as most
curtainwall systems, with the use of standard M or F type anchors. Standard midspan
anchors are used for wind load and dead load application. After mullions are set, the
system is ready for the glazing process to begin.
Before glazing, the interior gaskets should be inserted into the reglet of all verticals
and horizontals. The condensation drainage cord is located in its recess in the transom,
and is passed through a hole in the side of the vertical mullion. Position setting blocks
at appropriate locations, visually at quarter points. Now the opening is ready for
Insert the infill and align it so there is an even edge clearance around its perimeter. To
facilitate gasket installation, a spray bottle containing a low-concentrate liquid soap
solution or common glass cleaner can be used for lubrication. In freezing climates a small
amount of ethyl glycol can be added to the soap solution. Series 5800 curtainwall gasket
frames are sized slightly larger than the actual perimeter to allow for crowd-in and
proper compression at each corner. Gaskets should never be stretched during installation.
Begin glazing by tapping all four corners of a gasket into the aluminum frame. Next, tap
in the remaining gasket, starting each time from the center of a loop. Continue to halve
each loop until the gasket is fully tapped into position. This process ensures that the
gasket material is evenly distributed and that the corners fit snugly. If you have to
stretch a gasket, its the wrong frame for that opening. Run your fingers over the
gasket to feel for any uneven areas. Tap any excess into its correct position. The
installation is finished at the head and sill by fitting a straight length of perimeter
gasket. Use the same excess loop technique as previously mentioned for perimeter gasket
installation. Remember, do not stretch the gasket.
The visual appearance of the finished system is critical. The four-way junction of gasket
frames should be a tight fit, with no misalignment. Make a final inspection of the
finished wall. Gaskets that have been installed incorrectly can be seen or felt, and then
A significant feature of the Series 5800 curtainwall system is easy deglazing. Each gasket
can be individually removed to allow replacement of single panels, or for the complete
change of an elevation during remodeling. The silicone gasket engagement dart has to pass
over a portion of metal extrusion at each intersection. This is made possible by an
integrally-molded gasket corner dart.
Deglazing begins by gently easing the gasket corner dart out of its interlocking position
in the aluminum. This is done by using a deglazing tool, which has a curved, smooth and
rounded shaft. Working vertically, insert the point of the shaft between two gaskets, just
away from the outer edge of the gasket corner. Ease the gasket corner dart out of the
aluminum. The tool can then be inserted beneath the main run of the extrusion, and the
gasket gently removed from the aluminum framework. Use the same procedure for the
horizontal gasket length. Once a sufficient length has been eased out, the remainder can
be removed by hand. Always remove the gasket at a right angle to prevent damage to the
engagement dart. Continue removal by hand until you reach the next corner. The deglazing
tool is used again to disengage the molded gasket corner dart. Continue this method around
the rest of the opening until the whole gasket is removed. Examine the gasket for any
damage, and then place it in a polyethylene bag and label with the location for later
reference. The infill can now be removed for replacement or relocation.
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