Evaluation of Air Leakage Properties of Seam-Fastened Mechanically Attached Single-Ply and Polymer-Modified Bitumen Roof Membrane Assemblies
Why this work is in the frame
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Bibliographic record
Abstract
The National Research Council of Canada (NRCC) in collaboration with the Canadian Roofing Contractors Association (CRCA), National Roofing Contractors Association (NRCA), Roofing Industry Alliance for Progress, and the Single-Ply Roofing Institute (SPRI) addressed the issue of air movement in roof assemblies through a research and development project designated air movement impacts on roof Systems (AIR). The AIR steering committee developed goals for a two-phase testing program: Phase 1, quantify air permeances of single-ply and polymer-modified bitumen membrane materials; and Phase 2, quantify air leakage rates of seam-fastened mechanically attached single-ply and polymer-modified bitumen roof membrane assemblies. In Phase 1, four roof membrane materials were tested using ASTM E2178 test protocol to measure the air permeability rates. The tested materials meet the air permeability criterion of ASHRAE 189.1, ASHRAE 90.1, and the International Energy Conservation Code (IECC) for effective air barrier materials. In Phase 2, a test method for measuring air leakage rates across membrane roof assemblies was developed. Test assemblies were constructed with seam-fastened mechanically attached Phase 1 roof membrane materials, rigid board roof insulation, and steel roof decks. Each test assembly also included five common roof penetrations flashed in accordance with the manufacturers' installation instructions. The results demonstrated that the tested assemblies comply with ASHRAE 189.1, ASHRAE 90.1, and the IECC air leakage requirement for effective air barrier assemblies. An ASTM work item under the D08 committee is underway on the developed test method for measuring air leakage rates across membrane roof assemblies.
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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 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 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) | 0.000 | 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