Lime mortar lime putty when mixed at a 1 to 3 ratio, fill these voids to create a compact mortar. Analysis of mortar samples from historic buildings typically indicates a higher ratio of around 1 part lime to 2 part aggregate/sand was commonly used. A traditional coarse plaster mix also had horse hair added for reinforcing and control of shrinkage, important when plastering to wooden laths and for base (or dubbing) coats onto uneven surfaces such as stone walls where the mortar is often applied in thicker coats to compensate for the irregular surface levels. If shrinkage and cracking of the lime
Rugby Cement The business was first started in 1825 as a small family business by two local businessmen Thomas Walker and his son George Walker when they started producing lime mortar at a site on their land at New Bilton and nearby Newbold-on-Avon, exploiting locally available deposits of what Professor H.B. Woodward described in 1898 as "the finest inland section of lower lias limestone in the country". The first public company the "Rugby Lias Lime & Cement Company Ltd" was founded in 1862. In around 1870 the company began producing portland cement, and the company was renamed the "Rugby Portland Cement Company