Hygrothermal monitoring of replacement infill panels for historic timber-frame buildings: initial findings.

Chris J Whitman, Oriel Prizeman, Pete Walker, Iain McCaig, Soki Rhee-Duverne
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引用次数: 1

Abstract

Energy retrofits aim to improve the thermal performance of buildings' external envelopes. With buildings of traditional construction there exists the risk that these improvements may lead to interstitial condensation and moisture accumulation. For historic timber-framed buildings, this potentially exposes the embedded historic timbers to conditions favouring fungal decay and insect infestation. Hygrothermal digital simulations can assess this risk, but these have limitations, especially regarding the study of historic and traditional materials, due to a lack of accurate material data. The research presented in this paper therefore uses the monitoring of physical test panels to examine the performance of four different infill solutions. These are, traditional wattle and daub, a composite of wood fibre and wood wool boards, expanded cork board, and hempcrete. The article focuses on the design and construction of the test cell and presents initial results from the first year of monitoring, following the initial drying phase. These showed no evidence of interstitial condensation in any of the panel build-ups, with increases in moisture content correlating directly with climatic measurements of wind-driven rain. Infill materials with low moisture permeability were seen to produce higher moisture contents at the interface with the external render due to the concentration of moisture at this point. Those panels finished in the more moisture permeable lime-hemp plaster, overall present lower moisture contents, with reduced drying times. The use of perimeter, non-moisture permeable, sealants would appear to potentially trap moisture at the junction between infill and historic timber-frame. The monitoring work is ongoing.

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历史木结构建筑替换填充板的热湿监测:初步发现。
能源改造旨在改善建筑外部围护结构的热性能。对于传统建筑来说,这些改进可能会导致间隙冷凝和积湿。对于历史悠久的木结构建筑,这可能会使嵌入的历史木材暴露在有利于真菌腐烂和昆虫侵扰的条件下。湿热数字模拟可以评估这种风险,但由于缺乏准确的材料数据,这些模拟有局限性,特别是在对历史和传统材料的研究方面。因此,本文提出的研究使用物理测试面板的监测来检查四种不同填充解决方案的性能。这些是,传统的木条和涂抹,木纤维和木羊毛板的复合材料,膨胀软木板和大麻混凝土。本文重点介绍了测试单元的设计和构造,并介绍了在初始干燥阶段之后第一年监测的初步结果。这些数据显示,没有证据表明在任何面板堆积中存在间隙凝结,水分含量的增加与风驱动降雨的气候测量结果直接相关。低透湿性的填充材料在与外部渲染的界面处产生较高的水分含量,因为此时的水分浓度较高。这些面板完成在更透湿石灰-大麻石膏,整体呈现较低的水分含量,减少干燥时间。使用周长、不透湿的密封胶可能会在填充物和历史木结构之间的连接处捕获水分。监测工作正在进行中。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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