O 33 31 31 41 46 5o 51 54 54 52 55 56 51 65 61

Table 10.2 STC Ratings of Single Strength Glass in Various Frames

Frame Configuration STC Rating

Sealed (Average of 5 Tests) 28-29

Wood Double-hung, Locked 26

Wood Double-hung, Unlocked 26

Aluminum Sliding, Latched 24

wood door typically weighs about 4-5 lbs/sq ft (20-25 kg/sq m). Based on the mass law one would expect a transmission loss at 500 Hz of about 32 dB for a sealed door. Figure 10.18 shows that this is about what we measure.

In field installations there can be considerable leakage through a door seal at the jamb, head, and threshold. These seals tend to degrade in time due to wear and mechanical failure.

Table 10.3 STC Ratings of 7/16" Insulating Glass in Frames

Frame Configuration STC Rating

Sealed (Average of 2 Tests) 28-30

Wood Double-hung, Locked 26

Wood Double-hung, Unlocked 22

Aluminum Single-hung, Locked 27

Aluminum Single-hung, Unlocked 25

Figure 10.18 Transmission Loss of Openable Doors (National Bureau of Standards, 1975)

1 3/4" (45 mm,) Hollow Core Door A - Sealed into Frame

B - Mounted in Frame with Brass Weatherstrip o0moooo**

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in a 14 14 14 is is n n n is is 22222224272=121 B 1 6 15 15 15 \b 17 IS 17 15 IS 24 24 27 2S 30 32 lO

1 3/4" (45 mmj French Door - Single Strength ölass A - Sealed into Frame

B - Mounted in Frame with Brass Weatherstrip

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