Not to contradict Liveliner, but I have lived in my house for 16 years and the house is over 25 years old. Have the old particleboard backed CT's and have had no trouble. When I sold cabinetry, the particleboard was mandated to be waterproof by government regulation. We all know how wet particleboard from the old days would get wet and crumble. The big box stores also carry countertops.