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Dew Point will happen differently for the various climate zones we live in - cold, temperate, arid or tropical. For each zone, planning the correct insulation and air tightness strategy is critical because dew point is affected by many factors - seasonal temperature change, sunlight and air pressure. Your Energy Advisor can help determine the best strategy.

When you plan a retrofit for air tightness and insulation to the exterior, considerations for dew point and drying potential must be part of designing the most appropriate layering.

More information on Dew Point, Vapour Permeance and layers of construction can be found in Canada's 2015 National Building Code - Division B, Section 9.25.5.1. & 9.25.5.2