Natural Hydraulic Lime - XGAGHB
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Full details
The XGAGHB Limelite NHL 3,5 is a moderately hydraulic lime designed for general-purpose use in mortars, pointing, and rendering across various masonry types. It offers excellent workability and plasticity, making it ideal for both historic building conservation and new construction. A key benefit is its ability to gain strength through both hydraulic setting and carbonation, providing greater permeability than cement-based mortars, which is advantageous for older structures. However, users should be aware that its lower strength compared to cement means it may require more careful application in certain demanding scenarios.
All features
| Brand | XGAGHB |
|---|
Extended Product Information
FAQs
What is Natural Hydraulic Lime (NHL)?
Natural Hydraulic Lime is a binder made by burning limestone containing clay impurities. It sets by a combination of hydraulic reaction (setting in the presence of water) and carbonation (reacting with atmospheric carbon dioxide).
What is the difference between NHL 3.5 and other NHL grades (e.g., NHL 2, NHL 5)?
The number indicates the compressive strength after 28 days. NHL 2 is weaker and more flexible, NHL 3.5 is moderately strong, and NHL 5 is the strongest. NHL 3.5 offers a balance of strength and flexibility suitable for general use.
Can I use this lime for plastering?
Yes, Limelite NHL 3,5 is suitable for rendering and can be used for plastering, especially in traditional builds or where breathability is desired. Ensure the correct sand and proportions are used for plastering applications.
How does NHL mortar compare to cement mortar?
NHL mortars are generally weaker but more permeable and flexible than cement mortars. This makes them ideal for older buildings where cement's rigidity and low permeability can cause damage. NHL mortars have better workability and can accommodate movement.
What is the shelf life of Natural Hydraulic Lime?
When stored correctly in a cool, dry place in its original sealed packaging, Natural Hydraulic Lime has a very long shelf life, often several years. Protect it from moisture.
Do I need to add anything to the lime and sand mix?
Typically, only clean water is added to the lime and sand. Pigments can be added for colour. Additives should generally be avoided unless specifically recommended for a particular application or historic context.
Troubleshooting
Mortar is too stiff or crumbly
Add a small amount of clean water and remix thoroughly. Ensure correct sand-to-lime ratio is maintained.
Mortar is too wet or sloppy
Add more dry sand and lime mix in the correct proportion, then remix. Avoid adding excess water.
Slow setting in cold weather
Protect the work from frost. Consider using a slightly higher proportion of lime (e.g., NHL 5 if suitable for the application) or an accelerator specifically designed for lime mortars, if appropriate for the project.
Efflorescence (white powdery deposit) appears on masonry
This can be caused by soluble salts in the materials or rising damp. Ensure materials are clean and consider the source of moisture. Improved ventilation or a sacrificial render might be necessary. It's often a sign of the mortar doing its job by drawing out salts.
Pros and Cons
Pros
- Excellent for historic building conservation and renovation.
- Good workability and plasticity for ease of application.
- Suitable for both new build and traditional construction.
- Mortars can accommodate some degree of building movement.
- More permeable than cement-based mortars, reducing risk in older structures.
Cons
- Lower ultimate strength compared to cement-based mortars.
- May require more careful consideration for highly stressed applications.
- Setting time can be influenced by environmental conditions.
- Requires proper mixing and application techniques for optimal performance.
Setup, Compatibility & Care
Mixing Mortar:
- Ensure clean mixing equipment.
- Combine lime with sand in the recommended ratio (refer to manufacturer's guidelines or project specifications, typically 1:2 or 1:3 lime to sand).
- Gradually add clean water until a workable, plastic consistency is achieved. Avoid over-watering.
- Mix thoroughly to ensure uniform distribution of materials.
Compatibility:
This lime is suitable for most common masonry types, including brick, stone, and blockwork. It is particularly compatible with historic masonry due to its inherent properties. It should not be mixed directly with Portland cement unless specifically formulated as a blended product, as this can alter its setting characteristics and performance.
Care:
Store lime in a cool, dry place in its original, sealed packaging. Protect from moisture and extreme temperatures. Once mixed, use the mortar within a reasonable timeframe as it will begin to set. Cured mortar should be protected from frost during the initial setting period. Clean tools and equipment with water immediately after use.
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