I have slump block walls exposed on the interior of my house. I would like to cover them with sheetrock. My rooms are small so I would like to take up as little space as possible. I know I could fir out the walls and then sheetrock but is there another alternative that would take up less of the interior space? I have heard of adhering the sheetrock directly to the slump block with adhesive but I am skeptical of getting the walls level and concerns if the sheetrock could shift and end up with cracks and endless repairs. I have also heard of attaching lathe to the slump block and then applying plaster. Has anyone used either of these methods with long term success?