Articles tagged “stc”
17 articles covering stc in acoustic engineering and building design.
ISO 717: Sound Insulation Rating Systems (Rw, STC, Dnt,w) Decoded
Decode ISO 717 sound insulation ratings — how Rw, STC, DnT,w, and L'nT,w are calculated, why lab and field values differ, and how to avoid the flanking transmission trap.
Residential Acoustic Design: Part E, NCC & NBR Compliance Guide
Comprehensive guide to residential acoustic design compliance across three major building codes: UK Approved Document E, Australian NCC, and Brazilian NBR 15575. Covers STC, IIC, Rw, Ln,w targets, party wall and floor assemblies, flanking paths, and field testing requirements.
Sound Insulation vs Sound Absorption: Different Problems, Different Solutions
Understand why sound insulation (blocking noise between rooms) and sound absorption (controlling echo within a room) require completely different materials and strategies.
What is Acoustic Privacy? Controlling Who Hears What
Acoustic privacy is the condition where speech cannot be understood by unintended listeners. Learn STC requirements, speech privacy classes, masking systems, and open-plan vs closed-office strategies.
What is Airborne Sound? How Noise Travels Through Air and Walls
Airborne sound is noise transmitted through the air that strikes a building partition, causing it to vibrate and radiate sound on the other side. Learn STC, Rw, mass law, and control strategies.
What is Transmission Loss (TL)?
Transmission loss is the reduction in sound energy as it passes through a building element like a wall, floor, or window. Learn how TL is measured, what STC and Rw mean, and how mass law works.
IBC Acoustic Requirements — STC & IIC Minimums for US Buildings | AcousPlan
IBC 2021 Section 1207 acoustic requirements: STC 50 between dwelling units, IIC 50 for impact noise, state amendments, hotel and mixed-use requirements, compliance failures.
OITC vs STC — Which Rating for Outdoor Noise Insulation? | AcousPlan
OITC vs STC explained: why STC underestimates outdoor noise insulation performance, OITC methodology per ASTM E1332, frequency weighting differences, and when to specify each rating.
Lab STC to Field FSTC: How to Predict Real-World Sound Insulation Performance
Take a lab STC 55 partition and predict field FSTC accounting for flanking paths: floor, ceiling plenum, ductwork, and outlets. Full ISO 15712 worked example.
What Is Flanking Transmission? — Why Your Wall's STC Rating Doesn't Matter
Flanking transmission is sound that bypasses a partition by travelling through connected structure — floors, ceilings, ducts, or walls — and it routinely cuts field STC by 10 points or more. Here is how to find and stop it.
What Is Sound Transmission Class (STC)? — A Plain-English Guide
STC is a single-number rating for how well a wall, floor, or door blocks airborne sound. Learn what the number means, how it is measured, and why a higher STC is not always enough.
Acoustic Treatment vs Soundproofing: Why Most People Get This Wrong
The definitive explanation of the difference between acoustic treatment (controlling sound within a room) and soundproofing (blocking sound between rooms). Covers the mass law, decoupling, the 1% rule, STC vs NRC, and when you need each approach — with cost comparisons and worked examples.
Building Acoustics vs Room Acoustics: What's the Difference?
Building acoustics blocks sound between rooms using mass and decoupling (STC/Rw). Room acoustics controls sound within a room using absorption (RT60/C80). Here is when you need each, how they interact, and the standards that govern them.
LEED AP: Acoustic Performance Credit Study Guide — EQ Credit Requirements Explained
Complete study guide for LEED v4.1 EQ acoustic performance credit covering NC curve requirements, STC/IIC thresholds, HVAC noise criteria, documentation evidence, and key differences from WELL. Includes practice questions with explained answers.
Soundproofing vs Acoustic Treatment Cost — You're Probably Buying the Wrong One
Soundproofing (stopping noise entering/leaving) costs £200–£500/m² of wall. Acoustic treatment (fixing echo inside a room) costs £15–£80/m². 70% of DIY acoustic buyers purchase the wrong product. Here is how to know which you need.
Understanding Sound Insulation: STC, Rw, and Why Walls Don't Block All Frequencies Equally
STC (Sound Transmission Class) and Rw (Weighted Sound Reduction Index) both rate how well a wall blocks sound — but they use different standards, different frequency ranges, and can give different results for the same wall. Here is what each rating means, how they are measured, and which one applies to your project.
STC vs Rw: American vs European Sound Insulation Ratings — Same Wall, Different Numbers
STC and Rw both rate how well a wall blocks sound, but they use different frequency ranges, different reference curves, and can rate the same wall differently by 2-5 dB. For international projects, knowing the conversion matters. Here is the complete comparison with worked examples.