We moved a house with about a 5 ton real rock fireplace to a new location and are unsure of the required wall support underneath to keep it from coming thru the ceiling of the basement. Will 2x4 walls support that weight..... a closet was made under the fireplace that has the cement outside wall on one side, the closet door side, the back wall - regular 2x4 wall and the 3 1/2 foot short wall opposite the cement wall that has doubled up 2x6's. What should be there to support that weight, can it safely sit on 2x4 walls? Help. Thanks.