Mortar

[emmagleb]

Hi, I'm trying to specify using lime mortar for a house within a conservation area, rather than the usual cement lime. According to my boss, it is becoming increasingly difficult to find a builder who is prepared to use it - does anyone know why?
Also - what are the advantages and disadvantages of lime mortar over cement mortar? I've heard that lime mortar gets stronger and stronger by year, anything else I ought to know?!?! THANKS muchly, :-)

[beegeebee]

In days of yore, lime mortar was the defacto cement of the day. However it is made primarily with slaked lime (which is dangerous if it gets onto the skin--it burns) and sand. The mortar was also laid using "penny joints" i.e. the depth of the joint was a pre-decimal penny thick! There are very few bricklayers today who could work and lay bricks to such a demanding specification. However if you could obtain the services of an 80+ brickie then you may well succeed.
Lime mortar continues to set as it absorbs carbon dioxide and does not set in water, as does cement mortar. I believe lime/sand/cement is acceptable in conservation areas, but best talk to local builing control.

[Catso]

I believe you can now buy it ready-mixed, from specialists - pricey though.

It also has the property of having more 'give' in it than sand & cement.

The National Trust (and such like) use it in restorations, they may be able to advise.