Hygrothermal performance of sarking roof structure
Magarati Magar, Nirmal (2017)
Metropolia Ammattikorkeakoulu
2017
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:amk-201704285660
https://urn.fi/URN:NBN:fi:amk-201704285660
Tiivistelmä
The main objective of this thesis was to study the suitability of a new roof type, sarking roof in Finland. The sarking roof is used in the Southern Europe, but the climatic conditions in Finland are different. The Finnish cold climate has high humidity in the outside air. The air flowing through the sarking roof, could cause condensation and moisture could be trapped in the roof components causing decay and mold growth. This study of the hygrothermal behavior of the sarking roof is aimed at establishing whether such risk is real.
To study the hygrothermal behavior of the sarking roof, simulations of moisture and heat flow through various points of roof structure in various roof types were conducted with WUFI 2D. Highly accurate data of moisture and heat flows inside the various roof structures were obtained. The simulation results were analyzed and compared with the graphs of a mold growth experiment.
The study of simulation cases showed that there are no risks of mold and structural decay inside a sarking roof. It was established that an addition of sarking insulation improves the thermal performance of a roof and prevents thermal bridges through wooden rafters. Furthermore, the thesis showed that a board can be installed between the insulation materials without any moisture accumulation inside, which could damage the roof. The findings can open a new solution for roof insulation in Finland. Thus, this thesis can be used as a reference document for further research into a similar subject.
To study the hygrothermal behavior of the sarking roof, simulations of moisture and heat flow through various points of roof structure in various roof types were conducted with WUFI 2D. Highly accurate data of moisture and heat flows inside the various roof structures were obtained. The simulation results were analyzed and compared with the graphs of a mold growth experiment.
The study of simulation cases showed that there are no risks of mold and structural decay inside a sarking roof. It was established that an addition of sarking insulation improves the thermal performance of a roof and prevents thermal bridges through wooden rafters. Furthermore, the thesis showed that a board can be installed between the insulation materials without any moisture accumulation inside, which could damage the roof. The findings can open a new solution for roof insulation in Finland. Thus, this thesis can be used as a reference document for further research into a similar subject.