Plastering with NHL – Guide

Using St. Astier NHL plastering mortars instead of non hydraulic putty mortars reduces the working time by about 50%.  NHL mortars offer similar vapor exchange qualities as putty mortars but are more robust, can be sprayed and  used for decorative plaster work without the addition of gypsum. Requiring less after care than putty, it can be […]

Shelter Coat/Consolidation – Guide

The purpose of a shelter coat is to provide protection to surfaces that suffer unduly from the effects of erosion from wind, rain and pollutants or to protect and consolidate water damaged plaster. Generally they are used as a last resort in the knowledge that they offer the only solution, even a short-term one, to […]

NHL Renders – Guide

Defect Causes Remedies Shrinkage & Cracking greater than 3/16″Less than 3/16″ Hairline cracks General or partial movement of the background or the building.Thermal movement.Poor workmanship. Render too thick. Too much water in mix. Over saturated backgrounds. Insufficient setting between coats. Bad preparation of background.Over saturated background.Too much binder.Too many fines in sand.Finishing coat to thick.Too […]

Working with Mix & Go – Guide

Mix & Go is a premixed product designed to provide all the benefits of traditional lime mortars for wider general use in the construction industry, particularly new construction and general building repair.Mix & Go eliminates inconsistency in mixes, commonly associated with site practice, allows greater flexibility and comfort to the specifier in choosing a lime […]

Making NHL Mortar – Guide

NHL Mortar preparation: can be mixed in normal Mortar mixers. Put approx two-thirds the amount of water, one third the amount of sand and all the lime followed by the remaining amount of sand and additional water until the required consistency is achieved. Mortar should be mixed for at least 10 minutes. Greater workability and […]

Cladding – Guide

St. Astier NHL products for use with masonry cladding. For the purpose of this document Masonry Cladding means thin sections of masonry each one fixed back to a frame or substructure or to themselves. The masonry will generally be between 1 1/2″ to 2 3/4″ thick. Its main function will be decorative. Many cladding designs […]

Ashlar Joints – Guide

Traditional ashlar jointing and bedding mortars were made with lime and crushed chalk, usually with a small amount of crushed stone or sand added for bulk. This was mixed on a marble slab with just enough linseed oil to grease the tools, it was made up into a consistency similar to stiff glazing putty, wrapped […]

NHL Mortars: Consumption Chart – Guide

NHL products are bought by weight but mixed by volume. Their low density in comparison with other binders means that with the same weight one would produce up to three times the amount of mortar. Binder consumption for 1cu. yard of mortar: volume /weight comparison     Average Volumetric Mixes – lbs/cu.yd Binder Density (lbs/cu.yd […]


If you have a “chink” in the armor of a building it is usually due to different or moving materials coming together and the need for a filler that accommodates the differential in movement between the two masses. Plastics may work but many owners wanting to go green don’t want that between their logs in […]