Abstract
Moisture buffering describes the use of materials with high water-vapour sorption capacity to provide humidity control
 in interior spaces. Established models of the moisture dynamics of buffering are derived from conventional Fickian vapour-diffusion
 equations. We describe an alternative analysis using a Sharp-Front formulation. This yields a similar expression for the 
 moisture effusivity, several consistent scalings and a new definition of the moisture penetration depth. Features of the model are compared with 
 some published experimental data. A new sorption buffer index is a measurable experimental property that describes the water-vapour 
 buffer strength of the material.
Highlights
In buildings subject to episodes of high humidity it is sometimes useful to line interior surfaces with materials that have both high water-vapour permeability and high watervapour sorption capacity
The topic has a sizeable research literature. This deals with the moisture dynamics of buffering, material properties, test methods and performance
A simple Sharp Front model of water vapour sorption has been developed for the main purpose of describing moisture buffering
Summary
In buildings subject to episodes of high humidity it is sometimes useful to line interior surfaces with materials that have both high water-vapour permeability and high watervapour sorption capacity. The vapour permeability so defined is a property of the slab material expressing the rate at which it transfers water vapour under the action of a gradient of vapour pressure at constant total pressure. It is normally measured directly in a standard cup test [10].
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