Transmission of impact sound in wood-framed construction
Bibliographic record
Abstract
Ongoing studies in the flanking transmission facilities at NRC-IRC have developed a framework for predicting the overall sound transmission, including flanking, in wood-framed multifamily buildings. Power flow via each flanking path is affected by five factors that determine a path transfer function specific to the type of excitation (airborne or impact) and the construction details. This paper examines how common construction details affect transmission of impact sound between adjacent rooms, which are either side-by-side or one above the other. Since the source room floor is an element common to all impact flanking paths, a series of toppings were evaluated as treatment options. Additional layers of gypsum board and improvement due to resilient mounting were evaluated for the walls in the receiving room. Estimates of the resulting impact SPL were obtained by summing the energy transmitted by the direct path through the floor assembly separating the pair of rooms (if applicable) and all the flanking paths involving the relevant wall-floor junctions. These estimates provide the basis for a design guide to predict sound isolation in typical wood-framed row housing or apartment buildings.
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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 | 0.000 | 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 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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 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".