Wrapping it up: managing the successful hygrothermal supply and storage of timber boards

For the last three decades Architects and Engineers have used one and two dimensional hygrothermal simulation tools to better understand the flow of heat and moisture through building envelopes. These tools have provided significant guidance regarding risks of moisture accumulation and mould growth. Many of the algorithms used in these tools have been established around the physical properties of solid wood products. Recent research has identified significant concerns from the design and construction professions regarding the moisture content of kiln dried solid wood products at construction sites. Changes in timber moisture content are inevitable as it progresses from end of production, through to storage, transportation and installation. Using WUFI® 2D modelling, this research utilises recorded under-wrap temperature and humidity data to investigate the likely change in timber moisture content that occurs due to the use of impermeable membranes for timber packaging. Packaging used for timber is typically impermeable and comes in a variety of colours and translucency. Previous research has proven that timber protected from the elements by impermeable plastic wrap can experience significant moisture content change from 11% to >30%, dependent on climate and storage practices. Such changes in moisture content are likely to promote mould growth and early stages of decay, rendering the timber unsatisfactory for building applications. This research seeks to prove that digital modelling can be used to reliably predict changes in timber moisture content prior to dispatch and improve management practices including the wrap membrane (thickness, colour and translucency) to mitigate supply claims and material loss.