The study investigated the influence of different installation detail configurations on the moisture content of wooden window profiles during laboratory water exposure. Test specimens made of spruce, larch and oak were prepared using different installation joint sealing systems, surface treatments, and configurations with and without an external window sill. The specimens were exposed to water for approximately 48 hours, while changes in wood moisture content were monitored using the electrical resistance method. Differences in moisture uptake were observed among the sealing systems. In spruce and larch specimens, the lowest increase in moisture content was observed in configurations with sealing foil, whereas greater moisture uptake occurred with sealing cord and pre-compressed sealing tape. The presence of an external window sill did not affect moisture uptake equally in all configurations, and differences were also observed between surface treatments and wood species. In larch, the increase in moisture content was lower in oiled specimens, whereas in oak it was lower in lacquered specimens. The results indicate that moisture uptake in wooden window profiles is influenced not only by individual materials, but also by the overall configuration of the installation detail. Appropriate coordination of the sealing system, external window sill and material properties is therefore important when designing and installing windows.
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