Laboratory experimentation in wood frame wall drying with comparisons to WALLDRY (modified 1986 version) : final report / Morrison Hershfield Limited.: NH17-331/1991E-PDF

Canada Mortgage and Housing Corporation is developing a computer simulation program called WALLDRY as a tool to allow wall designers and researchers to predict the moisture performance of wood frame walls under selective climatic conditions. In this study, Morrison Hershfield Ltd. has incorporated air flow mechanism in the model, and performed a laboratory experiment to provide data for validation of the modified program. In the test program, six test walls (vented and sealed pairs), were monitored while undergoing simulated winter and summer conditions. The results of the experiment were compared with predictions from the modified WALLDRY program. This report outlines the experimental procedure conducted, along with comparisons of the simulation predictions. The modified WALLDRY program provides researchers with a tool for investigating the behavior of moisture in wood frame wall systems, without the complications of micro-climatic influences. Wind effects, solar gains and night sky radiation have been temporarily removed in order to compare with monitored laboratory conditions. This has reduced the number of variables acting on the wall, providing a clearer look into internal mechanisms and effects. As an additional benefit, data can be imported from a common Lotus-type spreadsheet rather than the complex binary weather file as in the previous procedure.

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