# Talk:Water Absorption Coefficient

Author: Hans-Jürgen Schwarz

English Translation by Sandra Leithäuser

back to Physical Principles of Moisture

## Introduction

The water absorption coefficient *w* is used for measuring the rate at which a building material absorbs water:

**Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle w= \frac {W[kg/m^2]}{\sqrt{t}[h^{0.5}]}}**

W = amount of water [kg/m²], t = time in [h]

The water absorption coefficient indicates, how many kg of water per hour one square meter of material absorbs through capillary action.

The water absorption coefficient is used to measure the rate of moisture absorption of building materials. |

Most common is the following classification of the water absorption coefficient
(in kg/(m2*h0.5))^{[1]}^{[2]}:

**Please double check!!!**

- water absorbent (w > 2)
- water inhibiting (w < 2)
- water repellent (w < 0.5)
- waterproof (w < 0.001)

## Weblinks

## Literature

There were no citations found in the article. --SLeithaeuser 14:50, 20 January 2013 (CET)