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STC Ratings

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STC RATINGS FOR VARIOUS WALL ASSEMBLIES

Below are the STC ratings of various wall assemblies, each presented to help illustrate concepts, improvements and rules of thumb. The estimated ratings are based on laboratory test results from various compendiums of STC ratings. It is recommended to consult a professional acoustician for more detailed information or to analyze the specifics of your project/assembly. To view different wall assemblies, click on each point below that may apply to your project. 1. Insulation will noticeably improve the STC rating of an assembly. 2. Staggered or double stud walls are higher rated than single stud walls. 3. Metal stud walls perform better than wood stud walls. 4. Resilient channel can improve the STC rating of an assembly. 5. Adding additional layers of drywall can improve the STC rating of an assembly. 6. Drywall between double studs can dramatically reduce the STC rating of an assembly. 1. Insulation will noticeably improve the STC rating of an assembly. Estimated STC Description Rating 3 5/8" metal studs, 5/8" gyp (2 layers total), No insulation 38 - 40

Wall Assembly

3 5/8" metal studs, 5/8" gyp (2 layers total), Batt insulation

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43 - 44

2. Staggered or double stud walls are higher rated than single stud walls. Estimated STC Description Wall Assembly Rating 2x4 stud, 5/8" gyp (2 layers total), Batt insulation 34 - 39

Staggered studs, 5/8" gyp (2 layers total), Batt insulation

46 - 47

2x4 studs, 5/8" gyp (2 layers total), Batt insulation

56 - 59

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STC Ratings

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3. Metal stud walls perform better than wood stud walls. (NOTE: This only applies to single stud assemblies. For double stud assemblies, there is virtually no difference.) Estimated STC Description Wall Assembly Rating 2x4 stud, 5/8" gyp (2 layers total), Batt insulation 3 5/8" metal studs, 5/8" gyp (2 layers total), Batt insulation

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34 - 39

43 - 44

4. Resilient channel can improve the STC rating of an assembly. (NOTE: These ratings are based on laboratory tests. Because of the special care required when installing resilient channels, actual results could be substantially lower.) Estimated STC Description Wall Assembly Rating 2x4 stud, 5/8" gyp (2 layers total), Batt insulation 2x4 stud, 5/8" gyp (2 layers total), Resilient Channel, Batt insulation

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34 - 39

45 - 52

5. Adding additional layers of drywall can improve the STC rating of an assembly. Estimated STC Description Wall Assembly Rating 2x4 stud, 5/8" gyp (2 layers total), Batt insulation 34 - 39

3 5/8" metal studs, 5/8" gyp (3 layers total), Batt insulation

39 - 40

2x4 stud, 5/8" gyp (4 layers total), Batt insulation

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43 - 45

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STC Ratings

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6. Drywall between double studs can dramatically reduce the STC rating of an assembly. Estimated STC Description Wall Assembly Rating

2x4 studs, 5/8" gyp (4 layers total), Batt insulation

44 - 45

2x4 studs, 5/8" gyp (2 layers total), Batt insulation

56 - 59

2x4 studs,5/8" gyp (3 layers total), Batt insulation

59 - 60

2x4 studs, 5/8" gyp (4 layers total), Batt insulation

58 - 63

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Rules of Thumb Recommended Ratings Weaknesses - What You Should Know The difference between STC and NRC STC Ratings for Masonry Walls Home

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