Hi, I'm trying to find out if it is possible to lower my conservatory floor level as it is 50mm higher than the rest of the ground floor. Im not sure what the floor base is made of, its a black material, asphalt maybe? If that's the case will there be concrete below this 50mm floor? Could I break the layer of slab up and level it to the level of the adjoining floor? Thanks in advance for any feedback.