21 Apr '17, 11am

The Exterior Rigid Foam is Too Thin!

Keep the interior relative humidity (RH) low during the winter. The lower the interior humidity, the lower the chance that exfiltrating air or outward vapor diffusion will introduce dangerous quantities of moisture to your wall cavities. So if you have a humidifier, unplug it or disable it. Install a few hygrometers around your house and check them regularly. During the winter, strive to keep your indoor RH at 30% or less. If the RH creeps above that point, operate your bathroom exhaust fans for 24 hours a day (or turn up your HRV (HRV). Balanced ventilation system in which most of the heat from outgoing exhaust air is transferred to incoming fresh air via an air-to-air heat exchanger; a similar device, an energy-recovery ventilator, also transfers water vapor. HRVs recover 50% to 80% of the heat in exhausted air. In hot climates, the function is reversed so that the coole...

Full article: http://www.greenbuildingadvisor.com/articles/dept/musings...

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