See warranty for details. *Exposed to water PRYZM™ planks will not swell, buckle or lose integrity. MULTI-WIDTH PLANKS. THE WINNING CHOICE. This sequence must be followed throughout the entire installation. Level floors with a suitable cement-based … Bathroom installation … ... All other trademarks are owned by Armstrong Flooring… Armstrong PRYZM Flooring may be installed in residential full bathrooms following the guidelines outlined in the Bathroom Installation Section I. 100% silicone caulk must be used around the entire perimeter. ... MUST be used in every other row. Learn how to install the Australian Armstrong Flooring PRYZM product (for Australian market only) *Not for USA market. PRYZM ™ Rigid Core Flooring. Armstrong PRYZM Flooring may be installed in residential full bathrooms following the guidelines outlined in the Bathroom Installation Section I.