Pre-mixed lime mortar is usually made by mixing an aggregate with either lime putty (wet mix) or a NHL lime (dry mix). Both are suitable for building and pointing. The wet mix mortar is typically supplied ready-to-use but will require ‘knocking up’ prior to use – ideally using a mortar mill.  Dry pre-mixed mortars require mixing with water prior to use. A range of standard mortars can be made using Singleton Birch limes, but should you wish to match an existing mortar, we could advise on an appropriate mix by analysing a sample of the original mortar.