National Applied Construction Products has developed a product that it says “solves another installation hurdle.” The problem: how to set tile and stone over porous surfaces. To help solve the problem, NAC introduces 101 Floor Prep. 101 Floor Prep seals and chemically hardens absorptive substrates in preparation for ECB, Strataflex, or SAM3 Membrane installations. The systems provide a bondable surface, as well as waterproofing and sound control, the company says.