The ASTC ratings of high-rise constructions using CertainTeed SilentFX® QuickCut gypsum board
Bibliographic record
Abstract
The 2015 edition of the National Building Code of Canada (NBCC) introduced significant changes to the acoustic requirements for residential constructions. The 2015 edition of the NBCC changes the acoustic requirements for residential constructions from requirements based on a Sound Transmission Class (STC) rating to requirements based on an Apparent Sound Transmission Class (ASTC) rating. The ASTC rating includes contributions from both the direct transmission through the common building element as well as flanking transmission through the attached junctions and elements. The ASTC rating is therefore a better metric than the STC rating for describing the sound insulation of a building construction. The 2015 NBCC requires an ASTC rating ≥ 47 for constructions between dwelling units. The ASTC rating that a building constitution will achieve depends on the design of the building elements including the gypsum board, the framing and the thermal insulation as well as the design of the junctions between the building elements. Changes to the building elements or the junctions may change the ASTC rating. This report includes twenty-two examples of the calculation of the ASTC rating for lightweight (25 gauge) steel stud walls typically used high-rise constructions in conjunction with concrete floors and ceilings. The gypsum board installed on the lightweight steel stud walls in the examples includes combinations of 15.9 mm (5/8”) SilentFX® QuickCut gypsum board and 15.9 mm CertainTeed Type X gypsum board directly fixed to the steel studs. The examples include both lightweight and concrete masonry façade walls. All of the constructions shown in the examples achieved an ASTC rating of 47 or greater.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.004 | 0.010 |
| Meta-epidemiology (narrow) | 0.002 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.004 | 0.003 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.003 | 0.001 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.025 | 0.021 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".