건축물의 에너지절약설계기준 방습층 정의에 따른 경량목조건축물의 습기안정성 (Moisture Stability of Lightweight Wood Frame Constructions by Vapor Barrier in Energy Conservation in Buildings)

서지정보

· 발행기관 : 대한건축학회
· 수록지 정보 : 대한건축학회논문집 / 41권 / 3호 / 269 ~ 280페이지
· 저자명 : 김민주, 류현진, 김석환

초록

한국의 경량 목조 건축물에서 방습층은 목재의 부식 방지와 내구성 유지를 위해 필수적이나, 방습층과 방수투습층의 정의가 혼동되어 습기 문제를 유발할 수 있다. 본 연구는 한국 기후를 대표하는 4개 지역(대관령, 서울, 부산, 제주)을 대상으로 건축물 에너지 절약 설계 기준에 명시된 방습층 자재 8종의 습기 안정성을 평가하였다. 그 결과, 대관령에서는 방습층의 Sd 값이 2.5m 이상일 경우, 서울, 부산, 제주에서는 Sd 값이 1.3m 이상일 경우 5가지 습기평가기준에서 문제가 발생되지 않았다.

영어초록

Lightweight wood frame constructions have been being built in Korea with increasing demand for eco-friendly, low-carbon buildings. A vaporbarrier in these constructions are essential for protecting from wood decay ensuring durability. However, definition of vapor barrier andwaterproof vapor permeable membrane are often conflated, so it results in many moisture problems in the constructions. This study evaluatesthe moisture stability of a standard configuration of lightwood frame construction across Korean climates, specifically Daegwallyeong, Seoul,Busan, and Jeju, using eight types of materials approved as vapor barrier in Energy Conservation in Buildings. Five evaluation criteria ofDIN 4108-3 were used. In terms of total moisture content, equilibrium within 10 years was achieved in all configurations and locations.
Short-term OSB decay was found in a year when vapor barriers with low Sd-values (≤1.3 m in Daegwallyeong, ≤0.3 m in Seoul) used,and when non-vapor barrier was used in Busan and Jeju. Long-term OSB decay evaluation indicats that vapor barriers with Sd ≤ 0.3 m areunsuitable in all climates, while the ZIP System®(Sd = 2.5 m) is inadequate for Daegwallyeong. Interstitial condensation on the insulationlayer was found in Daegwallyeong and Seoul with the vapor barrier of Sd ≤ 0.3 m in winter. The possibility of mould growth increasesacross all climates if a vapor barrier with an Sd-value of 0.3 m or lower is applied. It was observed even with vapor barrier havingSd-values of up to 2.5 m in Daegwallyeong. Thermal transmittance shows no decline over the ten years. Moisture problems in lightweightwood frame constructions were found in Daegwallyeong due to the vapor barriers with Sd-values of 2.5 m or below. For Seoul, Busan andJeju, no moisture problems were found if vapor barriers with Sd-values of 1.3 m or higher were applied. However, as this study focusedonly on the current vapor barrier standards, a further detailed study is required for the range of Sd-value from 0.5 m to 10 m. Additionally,for lightweight wood-frame constructions with rainscreen applications, it is critical to establish vapor barrier performance standards adapted toeach climate zone in Korea.

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