The invention discloses a waterproof heat preservation construction structure and method for a
flat roof, and belongs to the technical field of roof waterproof heat preservation construction.The waterproof heat preservation construction structure for the
flat roof comprises a house body and a cast-in-place roof, the cast-in-place roof is arranged above the house body, and a drainage
assembly is installed at the bottom of the cast-in-place roof; the cast-in-place roof is a
flat roof, a heat preservation plate, a slope making layer, a leveling layer, a waterproof layer and a
protection layer are sequentially laid on the inner side of the cast-in-place roof from bottom to top, a
brick stack is fixedly connected to the upper portion of the
protection layer, and a
cement plate is laid on the
brick stack. The four drainage assemblies are installed at the bottom of the cast-in-place roof, the connecting pipes penetrate through the heat preservation plate, the slope making layer, the leveling layer, the waterproof layer and the protective layer from bottom to top, rainwater flows to the filter screen from the iron grate, then is filtered through the screen, and finally is drained through the drainage
pipe, so that the rainwater can be rapidly drained, and the drainage efficiency is improved. The whole structure can be quickly disassembled and assembled, and use is convenient.