Understanding the Impact of Insulation on Moisture Content of Timber

Abstract

Retrofitting suspended timber floors can reduce energy demand, but also introduces moisture risks when insulation restricts natural drying. This study investigates the impact of partial spray foam insulation on the drying behaviour of pine timber, focusing on insulation timing, initial moisture content, environmental conditions, and measurement reliability. Pine specimens were conditioned under controlled conditions (20°C, 50% RH and 15°C, 80% RH) and insulated at varying moisture levels. Moisture contents were measured using the gravimetric method and three moisture meters. Results showed that insulation slowed drying compared to uninsulated timber, especially when applied at high moisture contents, prolonging exposure to decay thresholds. Safer outcomes occurred when the insulation was delayed until ≈22% MC under moderate conditions, although this was less reliable under cooler, more humid environments. Gravimetric analysis provided the most accurate assessment, while meters often mispresented values. The findings provide evidence to guide moisture-aware, durable retrofit practice.

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ORCID for Stephanie Gauthier: orcid.org/0000-0002-1720-1736

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