Conceptual Reference Database for Building Envelope Research Prev
Related Concept
  • drying potential of building envelope
  • country: Canada
  • wood frame houses and walls, wood structure
  • experiment: hygrothermal performance
  • simulate by water injection: rain penetration, water intrusion
  • as sheathing, and stays wet: OSB - Oriented strandboard

  • Related References
  • Hazleden, D., (2001), Envelope Drying Rates Experiment, Final Report
  • wall drying experiment
    Lawton et al. , (1999), Stucco-clad wall drying experiment
  • Quarles, S. L. and Tully, D.F, (0), Wood durability issues on the long-term performance of wood in service
  • summary and planning
    Salerno, M., (2000), British Columbia building envelope research program

  • Related Articles


    EDRA: Envelope Drying Rates Analysis Experiment

    In response to the Vancouver leaky condo problem (E-195), EDRA is one to the research attempt to provide solution the the rain penetration and envelope drying problem.

    Several associations form the Building Envelope Research Consortium (BERC), initiated by CMHC. BERC outlines four major research projects: a Field Survey to determine why buildings leak, a Best Practices Guide (BPG) to inform how to build a better performing building, a Quality Assurance Protocol (QAProtocol) to inform how to maintain quality as a criteria through all phases of design, construction, completion, and maintenance; and a Model Buildings Initiative to test the performance of buildings built using the BPG and QAProtocol. Later two other projects were added, the Building Envelope Education Program (BEEP) to certify professional architects and engineers as Building Envelope Specialists, and Envelope Drying Rates Analysis (EDRA), a series of laboratory performance tests of different wall designs and construction.

    A This link was checked on Dec. 2006summary(also see related references) of EDRA: objective: evaluate the effect of wall design on the drying capacity of wood-frame test wall panels in a controlled laboratory environment. Setup: 12 samples (1.22 m by 2.44 m), 10 stucco cladding and 2 cedar siding. Procedure: prior wetting by immersion to 25%-29%MC; testing 3 month under 5C/70%-20C/40% steady-statel; weight of assemble before and after; weighing components after. Test repeated for no light and with solar lamps (15C solar temperature). Results: all designs dry to below 19%MC. Sheathing (OSB, plywood) get wet by moisture redistribution from wet wood studs, and its MC stays quite constant through testing. OSB has over 30% MC in lower areas of panels. Larger cavity width dry faster.

    Web Links:

    CRDBER, at CBS, BCEE, ENCS, Concordia,