Gunsite Knife

http://andyqpuo794.angelfire.com/index.blog/1638700/when-professionals-run-into-problems-with-concrete-foundations-melbourne-calcon-constructions-this-is-what-they-do/

Where as in contemporary structure, the concrete piece may have under floor heating pipelines, and these pieces are cast above expanded polystyrene, a layer of insulation. A non-insulated slab is utilized is outbuildings,