All domestic hot and cold water system pipework concealed within floors should:
Be installed with a minimum number of joints. This is because joints are prone to a loss of integrity over time and therefore should only be considered where unavoidable.
Be installed in a chase/duct or void. Wrapping pipework in insulation is not an acceptable method of ducting.
Be appropriately clipped to avoid water hammer and other stresses which would affect the integrity of the installation.
Be insulated with a suitable gap maintained between the cold water, hot water and any other heat source to prevent heat transfer or loss.
Not embedded or come into contact with other materials such as backfill, screed or cement.
Be accessible to enable inspection and replacement. Further information about accessibility can be found in BS 8558.
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