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Managing Moisture with NUDURA ICFs

by NUDURA Blogger | Jan 23, 2017

According to ASTM E96, a material must not exceed 45 ng/Paּsּm² to qualify as a vapor barrier. This unit denotes the ‘permeance’ of the material, or how much moisture per force applied (air pressure), in a second over a square area. NUDURA Type II EPS qualifies as a vapour barrier with a permeance value of 36 ng/Paּsּm².

Although the joints between the NUDURA form units are tight, below grade waterproofing is still necessary. We sell a peel and stick waterproofing that is easy to apply and carries a two-year warranty. This membrane must cover the foundation walls. In situations where there is an attached garage, the below grade wall shared with the basement must be covered, and a 4 foot (1200mm) overlap to the adjacent walls.

Naturally, one of the main purposes of applying a vapor barrier and waterproofing is to prevent moisture damage, as well as mold and mildew growth. EPS has no active properties, which means it is very slow in any reaction. However, it does not mean that mold will never propagate on an ICF wall just because it uses EPS as insulation.

The truth is that without sufficient airflow, excess moisture can accumulate via condensation at any openings. If not evaporated, this build-up will eventually cause mold to grow on the paper of the drywall.

Part of a great ICF installation is adjusting your HVAC system for a tighter building envelope, which will require more air exchanges.

To learn more from our knowledgeable technical services team, please click here to contact us or call 866-468-6299.

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