Hessian, also known as burlap, is a loose-woven natural fabric made from the fibres of the jute plant. It is a robust, reusable material widely used in the construction industry for the curing and protection of fresh mortars, especially in traditional lime work. Known for its ability to withstand repeated wetting and drying, hessian is the material of choice for safeguarding lime mortars and renders during the critical curing phase.
Key Benefits
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✅ Protects from Frost: In colder months, hessian acts as a frost blanket, shielding fresh lime work from freezing damage
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✅ Prevents Rapid Drying: When dampened in warmer conditions, hessian creates a humid microclimate, slowing down moisture evaporation and preventing mortar failure
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✅ Acts as a Windbreak: Reduces wind-induced drying, especially on exposed elevations
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✅ Shields from Sunlight: Protects against direct sun exposure, a common risk in summer curing
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✅ Durable and Reusable: A long-lasting and eco-friendly option for multiple uses
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✅ External Grade: Suitable for use with lime and cement mortars or renders
Application Guidance
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Keep hessian damp in warmer weather to maintain humidity and reduce evaporation
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Use in layers or doubled-up for additional insulation in colder conditions
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Attach securely to the façade to prevent wind uplift
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Duration of use depends on lime strength and weather conditions—always follow best practice for curing times and environmental protection
Roundtower recommends hessian as an essential tool for aftercare, ensuring your lime-based work cures slowly, evenly, and safely—preserving its strength, durability, and breathability.
