Natural Hydraulic Lime - XGAGHB

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).

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.

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.

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.

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.

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.

Add a small amount of clean water and remix thoroughly. Ensure correct sand-to-lime ratio is maintained.

Add more dry sand and lime mix in the correct proportion, then remix. Avoid adding excess water.

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.

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.