ISO14644-4E.1.4

Internal finishes, durability and maintainabilityIn the completed installation, all internal surfaces should be finishedsuitably smooth, non-porous and free from cracks, cavities, steps andledges. The design and construction should be such that the numberof steps, ledges, cavities and similar features where contaminationcould collect is minimized. The number of corners should also be keptto a minimum, particularly internal corners. Corners and junctionsmay be radiused, especially at floor-to wall and wall-to-wall junctions,so that effective cleaning is facilitated. The finish should becompatible with the mechanical and chemical effects of the intendedmethods of cleaning and disinfection. Materials used for internalfinishes should be maintained to ensure that they consistently retainthe performance qualities consistent with the cleanliness class of theinstallation. This may require regular maintenance procedures andrepairs. Consideration of maintenance and repair methods anddisruption impact should form part of the materialselection criteria. Full lifecycle cost and contamination risk analysisprocedures should be considered.