Are there any specific recommendations about building materials and paints to be used internally to reduce humidity ingress, particularly in areas where low humidity is to be maintained?
To prepare any space for humidity control, the choice of vapour barrier is based on the degree dryness or RH. Commercial vapour barriers – moisture resistant construction material, paints and other coating offer a variety of design alternatives. Manufactures of vapour barrier materials can supply specific information on their products. Additionally, Bry-Air has prepared a note on suggestions for vapour barrier treatment to control the permeation of water vapour to the minimum. Between 40 – 50% RH, special vapour barrier paints will provide an economical reduction in moisture ingress. Below 35% RH, it is recommended to prepare the conditioned space properly with good vapour barrier treatment including polythene etc. as an inside envelope for reducing the moisture load which has a significant effect on the sizing of the equipment.
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