Field evaluation of ventilation wetting and drying of rainscreen walls in coastal British Columbia
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Notice bibliographique
Résumé
The climate in southern coastal British Columbia (BC) is characterized by a long rainy winter. Building envelope failures that have occurred in recent years in this region promoted the adoption of the rainscreen principle in both rehabilitation and new construction and are now mandatory in the wet regions of Be. In addition to the functions of a capillary break and drainage, drying in an air cavity behind the cladding of the rainscreen wall system may occur through cavity ventilation. Current practice varies in terms of cavity depth and vent heights for rainscreen walls clad with panel systems, especially with respect to the top slot vents. The awareness of potential drying provided by cavity ventilation initiated the idea of providing top vents on brick veneer walls recently in the BC construction industry. However, there exist different views on the drying provided by cavity ventilation based on existing research. Whether cavity ventilation would be beneficial for this climate remained open for discussion. To answer this question, a comprehensive research program was designed by Dr. Hua Ge with the candidate using a two-storey building envelope test facility at British Columbia Institute of Technology (BCIT) which Dr. Hua Ge developed. The candidate investigated twelve wall specimens, six clad with brick veneer and six clad with fibre cement panels, installed on the southeast façade, which faced the prevailing wind-driven rain direction. The test variables include cladding type, air cavity depth and height, vent configurations and initial moisture load in plywood sheathing to evaluate the impact of cavity ventilation on the drying and wetting of test walls. The hygrothermal conditions across the wall assemblies were monitored for moisture content (both resistive and gravimetric), temperature, relative humidity, air speed in the cavity and pressure differentials between top and bottom of each cavity. The on-site weather conditions were measured including wind speed, wind direction, solar radiation, horizontal rainfall, and wind-driven rain. Indoor conditions were controlled at 22±1°C and 55±5% RH In this study, the drying and wetting rates of plywood sheathing in the test walls during the winter and spring seasons were quantified, under-cooling effects on the temperature of cavity-surfaces of claddings and plywood sheathing were analyzed and the daily hours of condensation on the cavity-surface of claddings for all test walls were calculated. Simulation and measurements of MC in plywood sheathing for two brick veneer walls and two fibre cement walls were compared.
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Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,001 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,001 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découle