CHOOSING MIXES FOR MORTAR, RENDER AND LIMEWASH.
There is a great deal of discussion and some heated argument among the 'experts' as to what can be added to lime mortars and renders. This ranges from a purist 'nothing' through crushed brick or tile as pozzalanic elements, to small amounts of cement to get an initial set. Suffice it to say, that if an attempt is made to match the original fabric of a building, then where possible this should include the mortar/render mixtures.

Remember pure lime/sand is the softest and most permeable, cement based the hardest and least permeable. It is a question of choosing the most appropriate technology. The suggestions that follow are only for guidance, but have been used successfully in locations in Britain.

It is important that the users satisfy themselves that they choose an appropriate mix.