Evolution of the Acoustical Provisions within the Model National Building Code of Canada
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
This paper explores the evolution of the National Building Code of Canada (NBCC). Starting in 1941, the NBCC required sound insulation of walls and floors between dwelling units to be sound transmission class (STC) 45. There were restrictions on the attachment of fixtures. Refuse chute construction was described. In 1956 references to compromising air leaks were introduced. In 1965, STC 45 performance was added for a variety of service rooms. ASTM E90-61T was introduced. Minor changes occurred in the 1970, 1975, 1977, 1980, and 1985 versions. In 1975, a table was added showing sound ratings of assemblies. In 1990, STC 50 was introduced along with an STC 55 provision for elevator shafts and refuse chutes. In 1995, a larger table of expected sound ratings was included. No significant changes occurred for the 1995 or 2005 versions. The 2010 edition saw language added for secondary suites where an STC 43 rating was stipulated. The 2015 version added in the option of demonstrating either an apparent STC (ASTC) performance of 47 or STC 50. Additional reference was made to ISO standards in regards to flanking paths. Future changes are being considered for impact insulation class (IIC), exterior noise control, and low-frequency sources.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
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 it