Moisture Response of Sheathing Board in Conventional and Rain-Screen Wall Systems with Shiplap Cladding
Source abstract
Abstract
Abstract Building enclosures are subjected to a random climatic loading on the exterior surface and a relatively stable indoor condition on the interior. These loadings result in a transport of heat, air, and moisture across the building enclosure. In this paper, the drying and wetting of sheathing board in two exterior walls, more specifically 2×6 in.2 wood-frame conventional (no strapping between sheathing membrane and cladding) and a rain-screen wall system (with vertical strapping), are investigated through an experimental field study. The experiment is carried out at British Columbia Institute of Technology field exposure test facility, where the test walls are exposed to the coastal climate (Vancouver weather) on the exterior and controlled indoor temperature and relative humidity conditions in the interior. The field experimental results indicate significant moisture accumulation on the exterior sheathing boards (plywood) during the Winter period. During the 9-month monitoring period from March 13 to Dec. 6, 2009, the plywood underwent a process of drying and wetting. In both the conventional and rain-screen wall systems, the plywood dried to a comparable moisture level during the Summer before the wetting process started. For the wall systems considered in this study, the plywood in the rain-screen wall has a tendency of faster drying and wetting in the Spring and Fall seasons, respectively, in comparison to the plywood in the conventional wall, which is attributed to the presence of an air gap in the rain-screen wall between the sheathing membrane and the cladding. A similar trend is observed during the monitoring period from December 7 to June 15, 2010.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Structural Analysis of Composite Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Building Science Centre of Excellence, British Columbia Institute of Technology 1 , 3700 Willingdon Av., Burnaby, BCV5G 3H2, Canada (Corresponding author), e-mail: Fitsum_Tariku@bcit.ca
Dept. of Architectural Science, Faculty of Engineering, Architecture and Science, Ryerson Univ. 2 , ONM5B 2K3, Canada .
References (16)
Show source-provided references
1. Canadian Mortgage and Housing Corporation · 1996
2. Barrett, D. , “The Renewal of Trust in Residential Construction,” Report Submitted to the Lieutenant-Governor in Council Government of British Columbia, Crown Publication, Victoria, BC, June 1998, http://www.qp.gov.bc.ca/condo/ (Last accessed September 2010).
3. National Research Council of Canada, 2005, “National Building Code of Canada,” Ottawa, ON, Canada, http://www.nationalcodes.ca/eng/nbc/index_e.shtml (Last accessed September 2010).
4. Province of British Columbia, 2006, “British Columbia Building Code,” Queen's Printer, Victoria, BC, http://www.bccodes.ca/default.htm (Last accessed September 2010).
5. Onysko · 2000
6. On the Influence of Ventilation on Moisture Content in Timber Framed Walls
7. The Influence of Design on Drying of Wood-Frame Walls Under Controlled Conditions
8. Drained and Vented Cavity Walls–Measured Ventilation Rates
9. The Theory of Ventilation Drying Applied to New Zealand Cavity Walls
10. Ventilation Drying in Walls with Vapor Impermeable Claddings
11. Influence of Cavity Ventilation on the Drying and Wetting of Plywood Sheathing in the Rainscreen Walls in the Coastal Climate of British Columbia
12. Field Investigation of the Impact of Cavity Ventilation on the Wetting and Drying of Brick Veneer Wall Systems in the Coastal Climate of British Columbia
13. Hazleden, D. , “Envelope Drying Rates Experiment,” Final Report Contract No. 99–2221, Canada Mortgage and Housing Corp., Ottawa, 2001.
14. Simpson, Y. , 2010, “Field Evaluation of Ventilation Wetting and Drying of Rainscreen Walls in the Coastal Climate of British Columbia,” M.S. Sc thesis, Concordia University, Montreal, QC, Canada
15. Experimental Assessment of Hygrothermal Properties of Wood-Frame Wall Assemblies—Moisture Content Calibration Curve for OSB Using Moisture Pins
16. A Two-Storey Field Station for Investigation of Building Envelope Performance in the Coastal Climate of British Columbia