Homestar Technical Clarification Rulings
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| Technical Question Title | Tool Version | Date Released | Credit Name | Tool Category | TC Link |
|---|---|---|---|---|---|
| TQ172 STC criteria for EHC-9 | v4.1 | October 2022 | EHC | Link | |
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Approved Ruling: STC ratings are typically determined in a laboratory under controlled conditions, whereas ASTC ratings are site-specific and established through field testing. The NZGBC advises that ASTC(Apparent Sound Transmission Class) within 5 dB of the required STC (Sound Transmission Class) criteria is acceptable for EHC 9 verification. |
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