台灣有許多不同使用需求的鋼結構建築，有屬於工廠與廠房的大規模鋼構建築；也有屬於組合屋與臨時性建築的小規模鋼構建築，這類小規模鋼構建築多為「輕型鋼構建築（Light-gauge Steel-framed，LGS）」具有輕量、施工快速且廢棄污染低的特性。這類建築透過反射、阻隔以及散熱等原理進行隔熱，經過長時間使用造成隔熱層年久失修喪失其原始隔熱效能，造成內部空間過於炎熱。本研究目的，透過實際空間找出輕鋼構建築外殼隔熱效能最佳辦法，達到舒適的室內熱環境。實驗結果發現，輕鋼構建築從屋頂外側進行屋頂外殼隔熱效能較佳且較能降低熱直接進入室內，其中白色隔熱漆能夠有效反射熱量減少構造吸熱，對於延長時滯現象具有不錯的效果。

In Taiwan, light-gauge steel-framed (LGS) buildings are employed for a multitude of purposes; for instance, large light gauge steel buildings are used to house factories and workshops and small light gauge steel buildings are used as pre-fabricated housing units or restructured cargo containers. Thermal insulation is provided through reflection, isolation, and heat dispersion. However, after a long period of use and lack of repair & maintenance, the heat insulation layer gradually loses its initial heat insulation efficiency and the crude roofing insulation of these structures results in overheated interiors. This paper aims to find the best method for ensuring the outer roof heat insulation efficiency for the light gauge steel buildings, thereby maintaining comfortable indoor thermal environment. Experiment findings revealed that the efficiency of the outer roof heat insulation applied on the small light gauge steel buildings is better and more capable of reducing direct penetration of heat into the interior. Moreover, the white insulation paint has a significant time lag effect of two hours at a smaller level of heat flux, thus effectively reducing penetration of heat into the interior.