The edge of Plot A at Block 1 showing the thermal insulation layers which were omitted at the experimental plots. The layers installed on the (A) water proof membrane (the dark sheet on the surface in the foreground) include: (B) poly styrene foam 40 mm, (C) cement sand bedding 25 mm, and (D) precast concrete tile 35 mm.These layers were installed on the roof of Block 2 to denote good building thermal insulation.