A method for consolidating blocks of natural stone or recomposed material includes placing the block on a platform over a liquid and gas impermeable base sheet with spacers. Liquid and gas impermeable lateral sheets with spacers are glued to the side walls and extend beyond the top of the block. The block is inserted into an autoclave and a vacuum is applied. A fluid resin is dripped on the top of the block to cover it and to flow into the interstices between the block and the sheets. The vacuum is removed from the autoclave so that the resin penetrates into fractures and cavities in the block and the resin is allowed or induced to harden.