National Applied Construction Products' (NAC) ECB anti-fracture membrane is a self-bonding, sheet-applied elastomeric product designed to bridge all existing and future movement of the subfloor. ECB uses a two-component, patent-pending design.

ECB membrane protects tile from thermal and structural movement, live and dead loads, movement of cracks, and shrinkage, according to the company. ECB is available in 50-foot rolls of 1-, 2- and 3-foot widths.