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Comparative analysis for windows

Comparative analysis is acceptable for windows, provided the largest window manufactured is tested.  All smaller windows having the same system can be approved through comparative analysis and always complying with FBC Sections 2411.3.2.5 and .6. This normally applies to non-impact resistant windows, for impact windows the highest pressures obtained through comparative analysis may not exceed the cycled pressure tested.

Single hung window impact testing for large missile approval

Single hung windows shall be impacted two (2) times as shown below for each required specimen.

single hung window

Double hung window impact testing for large missile approval

Double hung windows shall be impacted:

Two (2) times as shown below for each required specimen.

double hung window

Testing specimens for the same series of windows using different mounting conditions

You may test one specimen of each of the above shown configurations to comply with the three specimens required.  Also, keep in mind that the fastening system used to anchor the window for the test is the anchoring system that will be approved for each of the configurations shown.  These anchoring systems must be specified in the set of approved drawings of the window, and verified by the certified laboratory conducting the test.

window anchoring systems

Minimum amount of testing required in order to qualify all the different glass if not qualifying for impact

For example, if all your extrusions are the same, and you provide a 1/8", 3/16", and 1/4" annealed glass thickness, the following is what you can do to qualify the window line.

First, test three specimens using the thickest glass for air infiltration, 1/2 test load, design load, water at the maximum that the extrusion will take (this should be to the corresponding pressure of the highest design pressure obtained among all the different glass thickness), full test pressure, and forced entry.

Second, you may test the specimen of 3/16" glass for structural loads only.

Third, you may test the 1/8" glass specimen for structural loads only. Keep in mind that the maximum design pressure obtained from these two last series of tests must fall in range for the corresponding water test performed in the 1/4" glass. The following is the resultant testing.

window anchoring systems

Note that the only thing that can change is the thickness of glass or type of glass

The glass type/thickness of windows when comparative analysis is used

The glass standard ASTM E1300 is the criteria to be used when designing the window and obtaining the minimum glass thickness to be used on a particular glass area. This standard however, is not the only criteria to be used when downsizing a window to change the glass type or thickness without performing the required tests.

Using a picture window as a simple example, the following will apply: 
First, one type of extrusion, and glazing method/system is used to qualify this window; if components of the window system change, (other than the glass type / glass thickness) then the product shall be treated under a separate product approval.

With respect to the testing for non-impact windows, TAS 201 and TAS 203 do not apply. Only TAS 202 will be used.  Test three (3) samples of the largest size window with the required glass thickness per the ASTM E1300 standard, to the requirements of TAS 202. 

Since in this example the unit is a fixed window, these units do not need to undergo the forced entry requirements. If it were an operable unit, all three units must be tested for forced entry also. These three samples will qualify this maximum size window with the glass tested.

The test sequence in TAS202 for testing a casement window which has three separate locks that are not activated by single action hardware

First, engage all locks and perform the air infiltration test.

Second, disengage all locks and only engage the center-most (main) lock.  Perform the 75-mph load test and water test as described in TAS202.

Third, engage the other two locks and perform the remaining procedures in TAS202.  forced entry resistance test (F.E.R.) shall be done with all locks engaged.

If a light on the unit breaks while conducting the test loads

You can re-glaze the light on the same specimen and perform the following structural loads: ½ test load, design load, and test load (both positive and negative). Note, the re-glazing procedure will be allowed as many times as there are lights on the specimen, but in no case shall any light be replaced more than once on a given specimen

Impact locations on a horizontal sliding window

  They are basically the same as the locations on a sliding glass door. See below.

horizontal sliding window

Back to Top Page Last Edited: Wed Apr 10, 2013 2:01:08 PM

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