Traditional Lime putty repointing - Oxfordshire, Gloucestershire, Buckinghamshire, Northamptonshire
After: please see youtube clip below:
Lime putty (commonly referred to as non-hydraulic lime or fat lime) is a product used exclusively on older properties. It is the mortar which was originally used in period property construction and its roots can be traced back to Roman and Egyptian times.
It is believed by many to be slightly softer and more vapour permeable than Natural Hydraulic lime (NHL) and also less cementitious. However, there is little evidence to suggest that this is true. It makes a negligibly lighter colour mortar which won't cure unless exposed to air. Although ideal for restoring historic buildings - it cannot be used during the winter months and should only be used when temperatures are 10 degrees or above. It also requires a higher skill level than natural hydraulic lime and can be a more time consuming product to employ.
Before (Pury End, Northamptonshire).
The example below is a close-up of one of my own blends of mortar used to achieve a historic match.
For further information on this, please go to:
When specifying putty it's worth considering the alternative of pre-mixed putty mortar. The benefit of its use are as follows.
- It can be stored indefinitely
- There is no need to inconvenience neighbours with noise, dust and dirt from a mixer
- There is no need for piles of sand to sit around on site
- If space is tight then containerised mortar can be stacked and used when required
- It can be used indoors without the need for potentially damaging wheelbarrow traffic
- It makes really good plaster and can cut down the hassle factor because it's already mixed.
Please see the photos below for examples of what eco-right COARSE STUFF looks like when set.
Some argue that when making the choice between lime putty and natural hydraulic lime it is best to have an expert eye assess the property to ascertain whether it was originally built with lime putty. If so, then it is best practice to continue its use. However, NHL 3.5 is a more than adequate material.
I would however suggest that the choice of contractor should be limited to one who is adept at working with putty as those who are less experienced may be reluctant use it.
When to use putty:
- Non-hydraulic lime is extremely compatible with weak and weathered stone
- If your building is old and is prone to movement because it sits on insubstantial foundations then lime putty is ideal because it is argued to be the most flexible mortar and many believe it copes better with settlement
- When it is important that mortar and not the stonework becomes the sacrificial element in the building.
When not to use lime putty:
- When the building is very damp. Putty requires a dry environment to cure. Damp buildings prevent this therefore NHL should be used as this will set in the presence of moisture.
- Very exposed areas and chimneys.
- During the winter months
- When curing times are a priority.
If you'd like to know more then please go to http://mike-teacherlife.blogspot.co.uk/2016/05/the-use-of-lime-putty.html
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