Evaluation of the infrared thermography technique for capillarity moisture detection in buildings

Abstract

Moisture problems are very frequent in buildings and, in most cases, are only visible when they are in advanced stages, thus causing financial losses and damages, and presenting difficulties for repairing to owners. Among nondestructive tests available in the market, infrared thermography has the capacity to be applied for this type of problem, since it can identify hidden problems and inspect large areas besides being fast and easy. In this sense, this article is intended to verify infrared thermography applicability for moisture detection by capillarity in buildings. Work methodology was developed through inspection of a building that presented evident signs of moisture by capillarity as well as potential development of this type of problem. Inspections were carried out during rainy season, when this type of manifestation develops the most. During test period, it was possible to verify that infrared thermography can accurately detect areas affected by humidity. However, it does not provide any information about problem severity. The thermal gradient between affected and intact areas may indicate the best inspection times -which occur when these values are at the highest level- as well as times not suitable for this activity. Despite finding failures, thermography presents many limitations, as it is influenced by environmental conditions, inspection schedule and the type of material where an issue takes place.