Lime Mortar

At bio space, we supply lime mortar for pointing, repointing, bedding and masonry repair across brick, stone and flint construction. Unlike lime render or lime plaster, lime mortar is chosen around the joint and the masonry it protects, so compatibility, breathability, aggregate and exposure all matter. Our range includes lime putty and heritage-style mortars suited to older solid-wall buildings, careful repair work and larger trade projects.

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Frequently asked questions
What is lime mortar used for?

Lime mortar is used for bedding, pointing and repointing masonry, especially on brick, stone and flint where a more breathable and sympathetic mortar is needed.

How do I choose the right lime mortar for my project?

The right lime mortar depends on the masonry type, joint size, site exposure and the existing mortar you are matching. On older buildings, the new mortar should typically be weaker than the surrounding masonry and SPAB (Society for the Protection of Ancient Buildings) also recommends matching existing mortar in colour, texture and strength wherever possible.

Is lime mortar better than cement for older buildings?

For many older solid-wall buildings, yes. Using lime rather than cement on pre-c1919 brickwork as hard cement can trap moisture and push decay into the bricks or stone instead of the joints. Lime mortar is usually the more compatible repair material where the original construction relied on vapour-open, sacrificial joints.

Do you supply lime mortar for trade and larger projects?

Yes. We supply lime mortar for both trade and larger projects, with bulk purchasing options available across our breathable masonry systems.

Is lime mortar made to UK-recognised standards?

Many manufactured lime mortars are specified against BS EN 998-2 for masonry mortars used in bedding, jointing and pointing. The lime binder may also be referenced against BS EN 459-1, and aggregates against BS EN 13139. As always, the exact product classification and suitability should be checked on the relevant technical data sheet.
What is the difference between lime mortar, lime render and lime plaster?

Lime mortar is the version used for bedding and pointing masonry. Lime render is the related system used on external walls, while lime plaster is used on internal walls and ceilings.