The Architecture Puzzler
Created by Dave Guadagni
Architecture Puzzler #368
The permeability of materials to water vapor is measured in perms. Materials with higher perm ratings are more breathable than those with lower perm ratings. These ratings vary by material and density. Materials used as vapor barriers have low perm ratings. True or false: a material with a perm rating greater than 1 is considered a "breathable" material?
Question from Last Week:
Architecture Puzzler #367
In trying to understand the value of a piece of property, what is the "Annuity Method"?
Answer to Puzzler #367
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Dave Guadagni, AIA, is an architect with Robertson/Sherwood/Architects
Quizzical Pursuit is Copyright 2008, Dave Guadagni.
The multilayer concrete exterior walls of the Canadian War Museum, in Ottawa, Canada, were engineered to resist in-wall condensation when the outside temperature plummets.
Photo: Tom Arban
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