▎ 摘　　要

NOVELTY - The utility model claims an insulating layer, from up to down orderly comprises a first perlite layer, a graphene layer, and a second perlite; the first pearl rock is provided with a round groove; the shape of the insulating layer is as follows: with a right-angled isosceles triangle bulge and a right-angled isosceles triangular gap of the hexagon, and the shape and the size of the right-angled isosceles triangular shape of the bulge and the right-angled isosceles triangle gap are the same; the right-angled isosceles triangle bulge after splicing to the right-angled isosceles triangular gap position can form a square; the circle centre of the circular groove is set on the right-angled isosceles triangular protrusion of the bevel edge middle point position. the insulating layer of the utility model uses two layers of pearl rock and sandwiched graphene layer in the middle to realize the external wall warm effectively, can improve the energy-saving effect of the building. insulating layer of the utility model, the circular groove set on the first pearl rock, the insulating layer is not easy to fall off, and realizes the stable installation.