The invention discloses a construction method of an external
thermal insulation system of a foam
cement thermal insulation board outer wall. The construction method comprises the steps that first,
thermal insulation boards are laid, specifically, a thermal insulation board laid layer which is formed by splicing the foam
cement thermal insulation boards is laid on a building outer wall; second, holes in the outer sides of a door and a window are reinforced, and the bottom of a middle-upper laid area, the top of a lower laid area and the inner sides of two side laid areas in the thermal insulation board laid layer are all covered with fiberglass gridding cloth to form a gridding cloth reinforcing layer; third, plastering construction is conducted, specifically, plastering construction comprises the processes of 301 primary rendering coat
mortar coating construction and fiberglass gridding cloth pasting, 302 secondary rendering coat
mortar coating construction and fiberglass gridding cloth pasting, and 303 plastering treatment of the holes in the outer sides of the door and the window; and fourth, finishing construction is conducted, specifically, finishing construction comprises the processes of 401
putty layer construction and 402 finishing
coating construction. The construction method of the external thermal
insulation system of the foam
cement thermal insulation board outer wall is simple in step, reasonable in design, convenient to construct, good in using effect, capable of completing the construction process of the external thermal
insulation system of the foam cement thermal insulation board outer wall easily and capable of guaranteeing the construction quality.