No. Hydrated lime sold for gauging cement mortars is different from natural hydraulic lime, which can set through a hydraulic reaction. Use the binder named in the mortar specification, particularly on older or historic masonry.
Hydrated Lime for Workable Mortar and Render
MacBlair stocks hydrated lime in 25kg bags for use in specified mortar and render mixes. Added in the correct proportion, it improves plasticity and water retention, helping mortar spread and finish cleanly. Hydrated lime is not the same as hydraulic lime or lime putty, so match the product to the masonry and specification.
Older or softer masonry may require a carefully selected lime-based mortar that accommodates moisture and movement. The sand grading and binder choice both affect colour, texture and performance. Review the broader masonry building materials range and seek conservation guidance where existing historic mortar must be matched.
Measure batches consistently and protect fresh work from rapid drying, heavy rain and frost. Nearby timber construction materials and roofing products should be detailed so water is managed away from the finished masonry.
Lime FAQ's
In a correctly designed gauged mortar, hydrated lime improves workability, cohesion and water retention. The proportion must suit the masonry and required mortar class, because adding lime casually changes the mix.
Use clean, well-graded sand selected for the application and desired joint texture. Fine aggregate for brick pointing differs from coarser material used for stonework, base coats or screeds.
It may form part of a specified mortar, but many traditional buildings require a lime binder and aggregate selected to match the original masonry. Obtain conservation or competent technical advice before replacing a soft historic mortar with a stronger cement-rich mix.
Keep bags dry, sealed and raised from damp floors. Wear gloves, eye protection and suitable respiratory protection when handling dusty powder, and follow the safety data sheet.