Lime mortar repairs -

[Redoctober]

Hello - I'm looking to undertake some "patching" up of our lime mortar but I'm confused as to which product is best.

I don't need vast quantities,  so I'm looking for an "all in one" if possible.

I have the gear ready to go, just no idea!!! 😁

 

Suggestions welcome.

[jayc89]

Mike Wye have been spot on for all my needs;

 

https://www.mikewye.co.uk/product/lime-mortar/

[George]

I've picked up some premixed tubs from here: https://www.traditionallime.co.uk/products/hydraulic-lime-products/natural-hydraulic-lime

 

What you will likely want is natural hydraulic lime, NHL3.5.

 

Just briefly, as the terminology is confusing:

 

Natural hydraulic lime - lime which sets in the presence of water. Comes in 2MPa, 3.5MPa and 5MPa strength. It's breathable, repairable and compatible with most old buildings. 3.5MPa is the most suitable for most things. 

 

Non-hydraulic lime (lime putty, fat lime) - lime which sets in the presence of carbon dioxide. This is a weaker mix and requires a bit more specialised knowledge to use. Only reserved for very delicate heritage uses, especially in mortars but is used more often in internal plasters.

 

Hydrated lime - lime which has been mixed back with water and is used as an additive with cement. It won't set on it's own and won't make lime mortar.

[Redoctober]

Thanks @George Most useful. 👍