Hank, Hi, I think you will find cable under the floor is a better option,and I feel it works much better than mats, if you have cable, and somthing goes wrong it "maybe" possible to replace the heating cable "maybe".... With matting well if or when it gets damaged, you cant just replace it. the whole area where the mat is has to be changed. Have a chat with your builder, and see what he thinks. John 2000 PS" as so I have not miss understood: we use both types here in Europe. Cable.. one long cable laid 1"/2" under the floor in endless squares (zig zag) Matting: is strans of thin cable matted together, hence "mat" this has power going through it witch in turn gives off heat.