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  • Roundtower NHL5

Roundtower - NHL 5

£14.00  Price includes VAT

Product Code: RTNHL5

Product Description

Roundtower lime NHL 5  is an eminently hydraulic lime suitable for marine environments, areas of high exposure and for Limecrete mixes.  NHL (Natural Hydraulic Lime) is made from limestone which contains naturally occurring impurities. These impurities aid the setting time and hardness of the lime. Roundtower Lime contains no artificial additives included in the mix. Available in 25kg water resistant bags.

NHL 5 is ideal for:

  • Rendering and Plastering in marine environments and highly exposed areas.
  • Limecrete
  • Chimneys, ridge tiles and wall copings.

NHL will set in the presence of water which makes it ideal for use on exterior applications.

For General building and plastering mortars, you may want to use NHL 3.5

For lower density masonry (e.g. limestone & sandstone) we would recommend the NHL 2.

Always remember that the mortar should never be harder than the masonry.

Application Examples

NHL type           Suggested mix ratio by volume
Pointing / building / plastering NHL 2 / NHL 3.5

2.5 Sharp sand :
1 Hydraulic lime

Laying Flag stones / Limecrete slabs NHL 5 2.5 Sharp sand : 
1 Hydraulic lime


Paving, copings, chimneys, 
parapets & high weathering applications

NHL 5 2 Sharp sand : 
1 Hydraulic lime

Approximate coverage rates:

Plastering & Rendering with a mix of 2.5 parts sand to 1 part lime at 10mm thickness covers approximately 8m².

Pointing Rubble Stone with a mix of 2.5 parts sand to 1 part lime covers approximately 10m².

Pointing Brickwork with a mix of 2.5 parts sand to 1 part lime covers approximately 16m².

Further information

We have a great selection of articles about lime and it's use. Everything from hotlime to bag-rubbing. Take a look at our Lime Products guide for information and inspiration.

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