The most common mode of joint deterioration is the wearing
of the arris (feather edge). This can be caused by a joint which has opened too
wide, or has arrises which aren’t aligned vertically, being trafficked by MHE. It
is found often in free-movement joints as these have the potential to open
This wearing can be much reduced by the installation of a
relatively hard joint sealant. Also, the use of joint armour helps to reduce
the chance of the joint wearing in this way.
(or replacement) can fill in small areas of damage, but larger or more
significant wear/ damage should be repaired using a resinous mortar and the
cut-back and fill method.