Salt-based fire retardants in wood façades face moisture-driven migration and leaching under weathering conditions (LeVan & Holmes, 1986; Östman & Tsantaridis, 2016; Takase, 2024). While prior work has addressed moisture movement and biocide leaching in wood (Glass et al., 2024; Lupsea et al., 2013; Niklewski et al., 2021; Waldron et al., 2005), fire retardant migration mechanisms remain less explored at the material level.
This study investigates the one-dimensional migration and redistribution of monoammonium phosphate (MAP) in Scots pine (Pinus sylvestris L.) under controlled single-sided water exposure, using gravimetric analysis, electrical resistance monitoring, and elemental mapping to evaluate moisture-driven transport mechanisms. The aim is to improve understanding of leaching mechanisms and support development of predictive numerical models for the retention of fire retardants in wood used for façade applications.
Keywords: Moisture-driven migration, Fire retardants, Scots pine
Authors
Maja Fjalland
University of Copenhagen, IGN, Denmark
DBI Fire and Security, Denmark
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