The Party Walls of all Buildings greeted after the; passing of the special Act within the Limits thereof shall be carried through and above the Roof, to form a Parapet of not less than Twelve Inches in Height, measured at Right Angles with the Slope of the Roof, above the Covering of the Roof of the highest Building to which such Party Walls belong; and all such Party Walls, and the external Walls of all Buildings, erected after the passing of the special Act, in or near any Street, or within the Curtilage:, of any House adjoining any Street, shall be constructed of incombustible Materials, and the Coverings of the Roof thereof shall not, without the previous Consent in Writing of the Commissioners, be constructed of combustible Materials; and it shall not be lawful for the Owner of any Building within the Limits of the special Act, having at the passing of the special Act a Roof covered with Thatch or other combustible Material, and contiguous to or adjoining to any other Building, to suffer: such Covering to such Roof to remain for a longer Period than Seven Years after the passing of the special Act, unless with; the Consent in Writing of the Commissioners; and every Person who shall erect any Building, or cover any Roof, or suffer the Covering Of any Roof to continue, contrary to the Provision here in contained, and who shall not remove or alter the same within One Month after Notice given to him for that Purpose by the Commissioners, shall be liable to a Penalty not exceeding One Pound for every P)ay that such Building or Covering to such Roof shall so continue.