NuHeat Membrane Sheet Size: 10sq ft x 25 Sheets. Customers can use NuHeat Membrane to replace a second layer of plywood/concrete board. In addition, this reduces the risk of tile cracks caused by movement in the flooring assembly. When combined with Nuheat Cable, the Nuheat Membrane system is a best-in-class uncoupling, waterproofing, and floor heating solution. Nuheat Membrane simplifies installation of Nuheat Cable.