Custom® Building Products has expanded its full line of crack isolation products with the introduction of Spider Web™ Uncoupling Mat, a crack-suppression underlayment, and Spider Web™ Mortar, a polymer-modified mortar. Spider Web is compatible with ANSI 118.4-recommended mortars in installing porcelain, large format or other tile “that demand the flexibility and high bond strength of a premium modified mortar,” the company notes.