Used mainly on historic buildings, soft masonry and where exact mortar matches are important.
Lime putty is not usually used on its own. It is the binder where the putty is mixed with a suitable sand in the correct ratio to make a lime mortar, lime render or a lime plaster to name its main functions. Lime putty can also be watered down to make a lime wash. It is sometimes used neat as a top coat plaster, however this work does call for a much higher level of understanding for the materials and degree of skill in carrying out this type of finish work.
The biggest advantage to be gained from using lime putty in a lime mortar or lime render is its ability to allow old walls to breathe. Unlike cement when it is used in building conservation as it is far too strong, much more impervious and tends to hold moisture captive within walls that have been built in solid form without a cavity.
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