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Problems with

Weak Frame Windows

Bowing, bending, and leaking.

Loss of efficiency and performance.

Fogging.

Vunerlability to air
and water infiltration.

Gilkey Window Company

The Gilkey Difference

Gilkey High Performance Windows: Factory Direct

Download this page in printable PDF format: click here.

Air Resistance

Airtightness is measured by applying 75 pascals of pressure — the equivalent of a steady 25 mph wind — to the outside of the window. Interior air infiltration is then measured in cubic feet per minute per foot of window joint.

Volume of Infiltration Window Type
0.002 cu. ft./min./joint ft. Gilkey fixed, casement and awning windows
0.086 cu. ft./min./joint ft. Gilkey sliding and hung windows
0.1 cu. ft./min./joint ft. High-end
0.3 cu. ft./min./joint ft. Mid-range
0.5 cu. ft./min./joint ft. Low-end

The results are from national tests under the following standards: AAMA NWDA 1011.S2-97.

Water Resistance

Watertightness is measured by projecting the equivalent of 5 U.S. gallons of water per hour per square foot of window area - the equivalent of 8 in. of rain in 1 hour. Air pressure is increased to simulate winds varying between 35 and 76 mph. Rating indicate the pressure attained without any interior water leakage.

Wind Pressure Grade (USA) Window Type
700 pascals - 14.6 psf DP 85* Gilkey fixed, casement and awning windows
400 pascals - 8.4 psf DP 55 Gilkey sliding and hung windows
300 pascals - 6.3 psf DP 40 High-end
200 pascals - 4.2 psf DP 30 Mid-range
150 pascals - 3.0 psf DP 20 Low-end

The results are from national tests under the following standards: AAMA NWDA 1011.S2-97.
* Beyond the scope of the standard.

Wind Resistance

This test measures the wind pressure a 30" x 72" window can withstand without suffering breakage (structural shattering) or permanent damage (structural deformation). The chart below shows the DP (Design Pressure) ratings or the highest wind loads a window withstands.

Wind Velocity Grade (USA) Window Type
220 mph DP 85 Gilkey fixed, casement and awning windows
205 mph DP 70 Gilkey sliding and hung windows
180 mph DP 55 High-end
160 mph DP 40 High-end
130 mph DP 30 Mid-range
110 mph DP 20 Low-end

The results are from national tests under the following standards: AAMA NWDA 1011.S2-97.

Forced Entry

This test reproduces the efforts of a well-equipped individual attempting to force entry. The test has three phases. Testers begin by trying to force open the window using tools like a knife blade, screwdriver, and wire. They then attach a cable to strategic points on the window and apply increasing loads. If the window continues to resist, they use tools again in a third attempt.

Windows rated F1 have a locking system, but have not been tested for forced entry. Windows rated F2 have successfully passed the test at level 10. Gilkey windows are rated F2, level 40.

Load Orientation

A. Parallel to the window from the handle.
B. Perpendicular to the window from the handle, first by pulling then by pushing.
C. Parallel to the window at center of the sash, from the bottom upward.
D. Perpendicular to the window where the sashes meet, toward the interior.

Rating Level Window Type
Level indicates the initial load applied to the cables
Level 40 - 300 lb. Gilkey Windows
Level 30 - 250 lb. High-end
Level 20 - 200 lb. Mid-range
Level 10 - 150 lb. Low-end

The results are from national tests under the following standards: AAMA NWDA 1011.S2-97.