Dictionary of Moisture Protection & Restoration

Repointing of mortar joints The removal of defective mortar from between the joints of masonry units and the replacing it with new mortar. See page 48 for types of joints. The mortar is not intended to tie the units together, but to separate them. The units need to move independently. Thus it is important that the mortar be softer than the units. Sealant installation Installation of material or devices used to prevent the passage of liquid or gas across a joint or opening. Sealant is used instead of mortar where movement is anticipated. Sealant will allow the movement but will prevent the water intrusion. The installation of sealant is critical. Please refer to Chapter III – SEALANTS. Maintenance It is not uncommon to hear that natural stones do not require maintenance. If this would be the case, our Roman structures would still be standing or would not need extensive restoration today. The proper choice of stones for specific application is vital and the proper protection of the stones to prevent water intrusion is also necessary. Nothing lasts forever-not even the stones. END OF CHAPTER V

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