DensDeck® Roof Boards

- Sound Isolation
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Tested Roof Assemblies - Verified Results

Introduced to the market 25 years ago, DensDeck® Roof Boards are the first gypsum roof boards tested to contribute to Sound Transmission Class (STC) ratings of up to 61 and Outdoor Indoor Transmission Class (OITC) ratings of up to 49 in roofing assemblies for commercial framed construction*. These high levels of sound attenuation are especially important as new code and building programs call for sound mitigation in wall and roof-ceiling assemblies.

DensDeck® Roof Board in assemblies still provide undeniable performance benefits including strength, fire resistance, moisture resistance and versatility – and are still the number one architecturally specified fiberglass mat gypsum roof boards.

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DensDeck® Roof Boards in Assemblies: Sound Testing Results

Recent testing* showed that in specific assemblies, DensDeck can help obtain superior STC and OITC ratings and can help meet UL Class A fire ratings, the highest rating for fire resistance under ASTM E-108.

Find the assembly that best suits your needs. Download the assemblies guide or contact us to get started. Click to view details on each type of assembly.

Sound Testing Results

Tests per ASTM E 90 and ASTM E 413, were conducted in 2011 at Riverbank Acoustical Laboratories. Results are based on characteristics, properties and performance of materials and systems obtained under controlled test conditions. Actual results may vary. Assemblies are presented for illustration only. It is important that you consult a design professional for assembly information. Georgia-Pacific Gypsum does not provide architectural or engineering services.

* A Sound Transmission Class (STC) rating is a single-number rating calculated in accordance with standard ASTM E413 using the Transmission loss measured at 16 one-third octave bands from 125 Hz to 4000 Hz. This rating is most appropriate for comparing performance of interior partitions to be used between rooms where there is not strong low-frequency sound.

An Outdoor Indoor Transmission Class (OITC) rating is a single number rating calculated in accordance with standard ASTM E1332 using the Transmission Loss measured at 18 one-third octave bands from 80 Hz to 4000 Hz. The rating is most appropriate for comparing the performance of exterior façade elements including roofs exposed to typical transportation noise sources.

1 Testing on these assemblies was conducted and passed at the Riverbank Acoustics Laboratories in Geneva, IL, one of the oldest and most respected sound testing laboratories in the nation.

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