Art & Science – Storm Windows
What do we mean by the “Third Generation” storm window?
The first generation aluminum storm window was a fairly tight unit. However, after a year or two of weathering, pitting and corrosion made these early models practically impossible to operate.
The second generation of windows, many of which are still on the market today from lesser manufacturers, have tilt action and anti-friction materials for convenience and ease of operation. However, they are not designed for optimum efficiency, thus missing the point entirely as to the true function and intent of a storm window.
Trapp® Storm Windows are Intelligently Designed, Adapted, AND Evolved
By combining the tight fit of the first generation, and the ease of operation of the second, we have created the third generation of storm window:
The Trapp® SNOWBIRD with WEATHERTRAPP.
How does the WEATHERTRAPP feature work?
Tests have proven that conventional storm windows have tremendous air leaks. The worst leak is caused by air entering at the bottom corner of the outside sash and funneling in along the entire length of both side rails. (Figure 1)
Any wind pressure pushes the outer sash away from the weatherstrip, allowing even more air infiltration. Some of today’s storm windows have this condition across the top rail as well. The SNOWBIRD’S WEATHERTRAPP feature eliminates this problem in the outer sash. (Figure 2)
The WEATHERTRAPP feature is created by the use of specially designed fin-type weatherstrip on the inner face of the outside sash and on the outer face of the inside sash. This creates a non-interrupted weatherstripped plane between the two sash that dramatically reduces the amount of air infiltration and is more effective than conventional storm windows.
How is the Trapp® Storm Window Different from our Competitors’ Designs?
Trapp® Storm Windows are designed for superior performance in real-world situations. Our engineers focus solely on improving the thermal performance of your home while maintaining your home’s aesthetics.
Top Rail: The WEATHERTRAPP feature is illustrated showing the FIN-TYPE weather strip on the inside of the outside sash where it is most effective.
Outside Sash Side Rail: The WEATHERTRAPP feature is continued by enclosing the side rails of the upper sash as well as the top rail.
Meeting Rails: The large interlock between the outside and inside sash is sealed with an extra heavy FIN-TYPE weatherstrip.
Inside Sash Side Rail: A positive seal is maintained by the anti-bow pins in the inside sash. Anti-bow pins are installed at the mid point of each side rail to prevent the sash from bowing in.
Bottom Rail: A continuous flat surface for the FIN-TYPE weatherstrip to seal against is provided by the addition of a filler strip that also keeps the outside track free of dirt.
Condensation Control: The lower sash locks in the closed position and also in a partially open position to control condensation.
What about condensation?
Because the SNOWBIRD is an exceptionally tight storm window, moisture may at times collect on the inside surface. This indicates that the storm window is doing its job of keeping the cold air out and that the air in the house contains excessive moisture. The condensation may be controlled by reducing the amount of humidity inside the house, resealing the inside window, or by opening the lower sash to the locked condensation control position.
REMEMBER – using the condensation control vent short-circuits energy savings. Use it only when absolutely necessary.