CLT: Managing Water and Vapor

High Moisture Capacity

CLT panels are constructed of wood, a moisture sensitive material, that is slow to dry. As a result keeping CLT products dry during construction and throughout the buildings service life is critical.

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Increase Substrate Drying

Studies show that VaproShield’s highly permeable WRB Systems increase substrate drying and reduce wet time of absorptive claddings  - resulting in enhanced wall assembly performance.

Mitigating Damage

Today's energy codes reduce the heat and airflow that once helped the building envelope to dry, leaving vapor diffusion as the only available drying mechanism.

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Protecting the CLT Structure with VaproShield’s Highly Permeable WRB/Air Barrier

VaproShieid’s WRB/Air Barriers are vapor open (permeable) allowing the CLT panel to continuously dry.

Highly permeable WRB systems such as WrapShield SA Self-Adhered are proven to increase substrate drying, reduce the wet time of absorptive claddings allowing permeable WRB membranes to enhance the wall assembly performance

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VaproShield Membranes Offer Solutions

VaproShield’s sheet membranes are highly vapor permeable, simultaneously managing bulk water while allowing for some drying of underlying materials.



CLT Design Guide


Wall Details


Roof Details