A reference on ice dam prevention, attic ventilation balance, and insulation continuity for sloped roofs across Canadian climates. Content covers the building science behind eave ice ridge formation, soffit intake sizing, and R-value requirements near the eave plate.
ClearPorchway focuses on one specific building failure mode: ice dams on sloped residential roofs in cold Canadian climates. The subject intersects three areas of building science — thermal insulation, air sealing, and attic ventilation — and the interaction between them is what makes ice dam risk difficult to address with a single fix.
Content draws on publicly available documentation from the National Research Council of Canada, Natural Resources Canada housing programs, and provincial building code supplements. No proprietary data or unpublished research is cited.
The articles on this site describe general principles applicable to residential construction in cold-climate Canadian regions — broadly, those in Heating Degree Day zones relevant to the NBC Part 9 requirements. Local conditions vary significantly; what applies in southern Ontario does not necessarily apply in northern Alberta or coastal Nova Scotia without adjustment.
Nothing on this site constitutes engineering advice or a substitute for inspection by a licensed building professional. Descriptions of code requirements reference the National Building Code of Canada but provincial adoptions and amendments may differ.
Articles are reviewed and updated as building code editions are revised and as new guidance from federal or provincial agencies becomes publicly available. The date displayed at the bottom of each article reflects the most recent substantive review.
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