Apparatus for preventing floodwater from entering a building

Apparatus for preventing flood water from entering a building, which comprises a first member (1) for permanent attachment to the walls of the building and adapted to fit around an opening in the building, and a detachable second member (2) adapted to be fixed to said first member, wherein said first member comprises a frame (3, 4, 5) adapted to fit around at least three sides of said opening and provided with first fixing means, said frame comprising two upright members (3,4) adapted for permanent fixing to the walls of the building on either side of the opening, and a third member (5) adapted for outward bowing away from the building and having a flat upper surface, and said second member comprise a curved member (10) provided at a circumference thereof with flanges (7,8,9) and with second fixing means adapted to engage said first fixing means, two of said flanges (7,8) being outwardly directed with respect to the curved member (10), and a third of said flanges (9) being mutually at right angles to flanges (7,8) and to said curved member, said flanges being shaped and sized to fit flat against the members (3,4,5) of said frame through a gasket [11] bonded to said second member around its circumference with said third of said flanges (9) extending horizontally on top of the third member (5) forming a step.