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Hygrothermal assessment of internally added thermal insulation on external brick walls in Swedish multifamily buildings

机译：瑞典多户住宅中外部砖墙上内部添加的隔热材料的湿热评估

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Proper and efficient renovation requires understanding the behavior of existing buildings and of different building materials. Analyzing hygrothermal measurements in two case studies, one with and the other without an internally added thermal insulation system, enabled us to identify factors of critical importance for further assessment through simulations, and to validate a hygrothermal simulation model of a solid brick masonry wall, a model used then to assess internally added thermal insulation systems of different types. A mold resistance design (MRD) model shows that, in connection with all internally added thermal insulation systems, the risk of mold growth is appreciable when brought on by solar driven vapor from the exterior. This, if biological material is present in either of two critical areas, those of the boundary between the thermal insulation and either 1) the existing masonry wall, or 2) the exterior surface of an internally added vapor barrier. Furthermore, assessments of corrosion risks are conducted for two critical placements of the bed-joint reinforcement. At a depth of 30 mm from the exterior surface, the corrosion risk was found to be less with use of capillary-active vapor-open systems than when no thermal insulation was employed, other systems increase the corrosion risk. At a depth of 90 mm, all thermal insulation systems increase the corrosion risk. Excluding precipitation uptake eliminates all risks, showing that this is the most crucial factor. Solutions that limit this uptake or increase the drying out rate should thus be considered beneficial. (C) 2017 Elsevier Ltd. All rights reserved.
机译：正确而有效的装修需要了解现有建筑物和不同建筑材料的行为。在两个案例研究中分析了湿热测量结果，一个有内部绝缘系统，另一个没有内部增加隔热系统，这使我们能够确定通过仿真进一步评估至关重要的因素，并验证了实心砖石墙的湿热模拟模型。然后使用模型评估内部添加的不同类型的隔热系统。防霉设计（MRD）模型表明，与所有内部添加的绝热系统有关，当由外部的太阳能驱动的蒸气带入时，霉菌生长的风险是可观的。如果生物材料存在于两个关键区域中的任何一个区域，即绝热层与1）现有砖石墙或2）内部添加的蒸汽屏障的外表面之间的边界，则这是生物材料。此外，还对床接头加强件的两个关键位置进行了腐蚀风险评估。发现在距外表面30毫米的深度处，使用毛细管活性蒸气开放系统的腐蚀风险要比不使用绝热层的系统低，其他系统则会增加腐蚀风险。在90毫米的深度，所有隔热系统都会增加腐蚀风险。排除降水吸收可以消除所有风险，这表明这是最关键的因素。因此，限制这种吸收或增加干燥速率的溶液应被认为是有益的。 （C）2017 Elsevier Ltd.保留所有权利。

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