Roundtower NHL 3.5 Lt Grey

Roundtower NHL 3.5 Lt Grey

Moderately Natural Hydraulic Lime - Used mainly for masonry and external plaster works. The most popular material for new build work.

This product is not available to buy online. Please contact us for pricing and more information.

€ 17.84 EUR
Every effort has been made to ensure the accuracy of our digital colours and textures however due to limitations with technology, we strongly advise purchasing sample products for testing in situ prior to the full order being placed.
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Delivery Information

Unless otherwise specified all products within Ireland should be delivered within 2-3 working days. Please contact us for delivery options outside of Ireland or if you wish to ship to Northern Ireland.

Our stock is primarily shipped by Fastway or via the pallet network depending on the total weight of the order. The delivery method will be automatically assigned and priced at checkout. All delivery prices include VAT.

Main Purpose

Used mainly for masonry and external plaster works. The most popular material for new build work.


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.

*All new Roundtower NHL bag designs will be introduced gradually once old stocks of bags have been used*

Natural Hydraulic Limes (NHL) are made from limestone containing impurities which enable a hydraulic set. They are supplied as dry powders, when mixed with sand and the addition of water they set through a chemical reaction known as hydration. This chemical set allows for NHL mortars to be used in damp and more exposed locations and produce an earlier resistance to frost than lime putty.

Natural Hydraulic Lime (NHL)is supplied in three European classifications, NHL 2 (feebly hydraulic), NHL 3.5 (moderately hydraulic) and NHL 5 (eminently hydraulic). These grades are based on compressive strength.

NHL has a number of qualities:

  • Lime reabsorbs a proportion of carbon dioxide (CO2) during curing and setting, thus offsetting part of CO2 created from production.
  • It allows buildings to 'breathe', and does not trap moisture inside the walls.
  • Lime mortars are very workable.
  • Lime allows masonry to be recycled at the end of its life and does not damage brick and stone.

Roundtower lime NHL 3.5 is a great all-round hydraulic lime suitable for most locations and conditions. 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. Natural hydraulic lime is 100% natural.

Roundtower NHL 3.5 is ideal for the below:

  1. Plastering/Rendering.
  2. Pointing stonework, brickwork, and blocks.
  3. Mortars for construction.

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

Each bag contains 25kg. Each pallet contains 56 X 25kg bags.

Working temperatures should not be below 5 degrees. Make sure that high suction materials are thoroughly dampened before application. Avoid rapid drying due to high temperatures or strong winds using appropriate curing methods. Protect fresh mortar from frost, rain, direct sun and strong wind for a minimum of 48 hours depending on the time of year.

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