The 24th Conference on International Cooperation on Conservation titled “Thinking of conservation with a protective shelter” was held on July 8, 2010, with 71 participants. Protective shelter are sometimes used to conserve sites. To understand the advantages and disadvantages of protective shelter, it is necessary to know their state after a certain number of years have passed since they were built. For this reason, we asked three persons to make presentations and then we had general discussions. First, Mr. Anat Bamurunwonsa of the Fine Arts Department of Thailand gave a lecture titled “Protective shelter for a pair of Buddha’s footsteps in the Prachinburi Province.” This was followed by Mr. Irisa Tomoichiro of the Cultural Properties Protection Division, Fukuoka Prefecture, who delivered the lecture “Varied forms and current status of protective shelter in Fukuoka.” Then, Ms. Shin Eun-Jeong of the National Research Institute of Cultural Heritage, Korea, gave a lecture titled “Current status and case study in covering roofs for stone cultural properties in Korea.”The lectures and discussions made us recognize, for site conservation, the need to appropriately decide on specifications of protective shelter, after understanding the conditions such as the ambient environment of sites, and the importance of continuously monitoring the built roofs.