Dumawall Wall Paneling - Bathroom Application Dumawall is a lightweight, easy to install waterproof wall tile. Produced with the revolutionary patented RCB® (Rigid Core Board) technology and featuring an interlocking tongue and groove system, Dumawall is durable, 100% recyclable, obtains a Pass™ and complies with S14G of the New Zealand Building Act 2004. #dumawall #wallpaneling #psp #design #tile