my floor joists are 2 x 8 on 16 inch centers, the room is 15' x 10' and is supported on 3 sides by load bearing walls, including the outside foundation and two concrete partition walls underneath. my idea is to make 2 5 foot beams which will be 6"x 6" (out of 3 6 x 2 glued and screwed) and place them directily under the safe with floor jacks, any advice is appreciated.