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Lime mortar sparks fierce debate in the building world, and after the reaction to our previous video we decided to dig deeper and let the experts speak.
Conservation specialists, tradespeople and restorers all have different perspectives on lime, NHL, cement-lime mortars and hot-lime mixing, and the reality is far more nuanced than the internet arguments suggest.
Mortar choice depends on brick quality, wall type and moisture management.
In many cases cement-lime mixes perform perfectly well, while soft historic bricks may still benefit from traditional lime mortars.
Like many things in building, context matters more than dogma.
Key Takeaways
• Lime mortar debates are often driven by strong opinions, but even experts disagree on the best approach.
• Pure air lime offers breathability and sacrificial protection but sets slowly and can be impractical on modern sites.
• Cement-lime mortars such as 1:2:9 were widely used in 20th-century housing and have performed well in many buildings.
• Moisture management is critical. Water ingress, brick quality and freeze-thaw cycles often cause more damage than mortar choice.
• Hot lime mixing and traditional methods can work well but are labour-intensive and require careful handling and safety precautions.
• Choosing the right mortar depends on the specific building, materials and environment rather than a one-size-fits-all rule.
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#lime #limemortar #brickwork #buildingmaterials #restoration
