|Waterproofing methods for applying to roof-top in the building are various, but it is not enough to development,, which are simplified and low-cost method for old building. Especially, these buildings have not only a low insulation,, but a disadvantage for energy. A floating floor method is necessary for this. This study performs an experimentt about bonding capacity of complex panel for waterproofing and heat insulation. The bond strength experiment is based on KS F 4716, and it is considered by bond mix proportion about panel and slab.