Saint-Astier® Natural Hydraulic Lime (NHL) is an industry-standard used for historic restoration mortar, stucco, and Plaster with no harmful portland cement present or required. Hydraulic lime is a type of lime, or calcium carbonate, which is used to make mortar and plaster products. It is the silica and trace elements that when burnt, become reactive with water and will cause an initial hydraulic set of the mortar when mixed with water. Heritage Mortar NHL2 NHL3.5 & NHL5. Mix for at least 5 minutes then add cement and finally water to adjust the workability. View Details. Lime Green hydraulic lime mortars are available pre-packed in 25kg paper sacks for smaller jobs or can be delivered in 1000kg bulk bags as required. Add some water to the mixer, then sand and hydrated lime. We are providers of natural hydraulic limes, lime putties and traditional building tools & accessories, used especially for the conservation and restoration of buildings. These mixes do give you a buff coloured mortar using a general building sand. Lime pointing of traditional masonry using lime mortar based on lime putty or natural hydraulic lime (NHL) offers many advantages over cement based mortars. You want your mortar to be softer than the masonry. View Details. Hello jttl We use a 3.5 Hydraulic lime mix for pointing (ratios: 1 hydraulic lime, 2 soft sand, 1 sharp/grit sand), and for walling we use 5.0 Hydraulic lime (ratios: 1 Hydraulic lime, 2.5 soft sand, 0.5 grit/sharp sand). Some natural hydraulic lime will test higher in the qualifying band, and some test lower. Traditional lime mortar, sometimes referred to as natural lime mortar are made using proportions of sand and lime, the lime acting as a binding agent. Welcome to The Lime Store, Dublin. The less hydraulic a lime is, the more it will flex and move with a building. Lime mortar made with local sand to produce a pale-yellow coloured mortar using Morestead 3mm sand and St Astier natural hydraulic lime. If not purchasing a pre-mixed mortar … Strength will also vary depending on the mix ratio and the type of aggregate used. Cement based hydraulics work on heat and cant be woken up; dry much faster making them harder to work with. Lime mortar is a combination of lime (hydraulic or non-hydraulic), aggregate (sand, grit etc) and water. Introduction When mixing separate bags of cement and lime, hydrated lime must be completely wetted out in the mixing process or it will continue to absorb water after mixing. 11 Item(s) Show. Method 1: Hot lime mortar. Carefully choose which lime is most appropriate for the situation, selecting a weaker mix for a weaker, more porous masonry. Natural Hydraulic Lime (NHL) 3.5 comes dry in 55 pound bags with no artificial additives. Mortar mixes are in general, proportioned by volume. Sand colour will determine the colour. If you are working on a larger project, or a commercial development then we can mix mortars to your specific requirements and arrange silo storage for extra on-site convenience. There are two main methods of preparing a hot-mixed lime mortar. How much movement will the mortar have to cope with? The most common formula of a Type-O mortar is 1:2:9, a blend of 1 part white Portland cement, 2 parts Type-S hydrated lime (most often dolomitic lime) and 9 parts sand by volume. A dry powder which requires mixing with water on site. Pre-mixed hydraulic lime mortar. It turns out that this is what was used to restore Hadrians's Wall! THE HERITAGE RANGE Site-made mortar. Lime mortar may require slightly longer curing times but the methods and principles are the same. Bricks of the 19th century through to even the 1950’s are more porous than today’s bricks. For example, the Great Wall of China, the Houses of Parliament and Rome Colosseum. Pre-Mixed Non-Hydraulic Lime Mortars. Preparation of the mix. I've done another hour or two's searching, and I think I might be fine with some kind of portland & hydraulic lime mortar. The lime is heated, then mixed with an aggregate material like sand or stone. A lime:sand mortar mix may be produced by either: For accuracy, use buckets or gauge boxes rather than shovels. If anyone wants to know more about this then just google "The hydraulic lime pointing mix contained a 'trowel full' of ordinary". EcoRight Village Moderate Hydraulic Mortar will reach HLM1 (class IV) at 28 days and HLM2.5 (class III) at 91 days (good/high resistance to freezing & thawing, high resistance to sulphates). For site-made mortars, mix proportioning is normally by volume. Lime can be measured as putty or as dry hydrated/hydraulic lime, as the weights of calcium hydroxide per unit are in roughly equal. Read more about lime: Lime: The Civilized Plaster Natural Hydraulic Limes: A Plaster in a League of its Own. Products Sort by: Lime Green Buff Coloured Natural Hydraulic Lime Mortar NHL 5 (25kg) £15.75. The new Cornerstone range of mortars are available in 25 kg bags to which you just add water. The strength of a hydraulic lime mortar varies depending on the manufacturer of the hydraulic lime. Once this mixture is blended with water to form mortar, it can be used in many types of masonry construction projects. Natural Hydraulic Lime is available in 3 different strengths. Stones are naturally porous as well. Unfortunately, over the last 150 years or more, Portland cement based mortars have commonly been used for repointing joints that were previously filled with lime mortar. Lime mortar, especially putty lime mortars can become soft and friable with age but this does not necessarily mean they are not functioning. The beauty of lime mortar is that it allows the stones to “breathe” and “flex”. Remember the color of the sand will largely determine the color of the mortar! Generally hydraulic lime provides a faster initial set and higher compressive strength than standard air lime. 3 sand to 1 Lime putty is general mix. However, the following mixing procedure can reduce this problem The mix, to begin with, will appear dry but as mixing time increases the mortar will become much ‘fattier’. Pre-Mixed Fat Lime Mortar (Rhondda) ... Pre-Mixed Fat Lime Mortar (Blaenavon Dark) Starting at: £6.75 . The more exposed to the elements a lime mortar or lime render is, the greater the need for a faster set and greater durability, to cope with harsher freeze thaw cycles. PLEASE NOTE: Strongest isn’t always the best. Why use hydraulic lime mortar? 1. Set Descending Direction. Lime mortars mixed in drum mixers are prone to balling. Mixing should either be done by hand on a clean surface or in a mechanical mixer. Saint-Astier® Natural Hydraulic Lime. These historical buildings are still here today, due to its unique beneficial properties. Once the desired consistency is reached mix for a further twenty minutes. Non-hydraulic mortar can be woken up. Pre-mix Hydraulic Lime Mortar - Lincolnshire Lime. It contains hydrated lime and plasticiser making it highly workable and cohesive. Both produce a mortar that can be used for various types of lime work including bedding, pointing and harling. Lime mortars for lime pointing are generally softer and more porous compared to mixes using cement therefore allowing moisture to evaporate from the joints more freely. By following the proper mixing procedures, excellent board life, workability and sand carrying capacities are achieved with lime mortars. Available in NHL2 NHL3.5 or NHL5. Hydraulic Lime. And add our pigments for even more color variations! Pre-mixed, ready-to-use mortars are also available as BioMix 35. Throughout history, in the construction of traditional stone buildings and stone walls, there have been two basic types of lime mortar used: hydraulic lime mortar and non hydraulic lime mortar. Roundtower Lime are a supplier of premium lime products to the conservation and eco build construction sectors. Rugby® Hydraulic lime (HL) is a term for varieties of lime (calcium oxide), or slaked lime (calcium hydroxide), used to make lime mortar which set through hydration. Hydraulic lime is chemically very similar to non-hydraulic lime but it contains impurities, called pozzollans, that allow it to set in two stages: the first set is when water is added, and the second occurs as the mortar is exposed to the atmosphere. Saint-Astier® NHL is pure and natural, free of additives, and has been in use throughout the world for over 150 years. This type of hot mix is typically used for building or pointing rubble masonry, and for harling. POINTING WITH LIME MORTAR Whether using a natural hydraulic lime or a lime putty based mortar, the application techniques are identical. We are now able to offer a range of pre-mixed hydraulic lime mix suitable for re-pointing, rendering, plastering and bedding. Sort By. Pre-Mixed Fat Lime Mortar (Cheshire) Starting at: £4.75 These mortars comprise St Astier natural hydraulic lime mixed with suitable sands. Lime Mortar has been used in the construction of buildings for over 2000 years, and used on the most iconic historical landmarks across the world. Pre-Mixed Fat Lime Mortar (Blaenavon) Starting at: £6.50 . 7. If too much water is added the risk of shrinkage will increase and the final strength reduced. This will absorb any movement in the walls and stop the masonry cracking. (The above example is based on a mix ratio of 1:3). EcoRight Hydraulic Lime Mortar M2.5 This is known as a moderate mix with the following proportion 1:2¼. Due to the introduction of Portland Cement in the 19th Century, the use of lime declined. Mix with sharp sand at a ratio of 2 1/2 parts of Mason’s sand to 1 part NHL. Weather resistant and durable, this mortar is ideal for most brick and block applications and is formulated to provide a general purpose mix of cement, lime and specially graded sand. By properly selecting aggregates and proportions, it is possible to produce mortar mixes ranging from 2.6 MPa to 5.1 MPa (380-740 psi) at 28 days with NHL 3.5, making it the most versatile of Natural Hydraulic Limes. The number indicates the compressive strength in N/mm2 of the mortar when set. Hydraulic Lime (NHL) NATURAL HYDRAULIC LIME (NHL) is produced by burning and slaking limestone which is quarried with a proportion of silica and trace elements. £18.90 inc. VAT. We provide information and consultancy on all aspects of conservation and restoration of buildings. Buff coloured NHL 5 lime mortar. Necessarily mean they are not functioning flex and move with a building depending on the mix ratio of 1:3.! Following the proper mixing procedures, excellent board life, workability and sand capacities... 3Mm sand and hydrated lime not functioning an aggregate material like sand or stone to adjust the.... The more it will flex and move with a building proportioned by.. Our pigments for even more color variations additives, and has been in use the... Offer a range of pre-mixed hydraulic lime mortar is that it allows the stones to breathe. Its unique beneficial properties restore Hadrians 's Wall in 3 different strengths out that is... And sand carrying capacities are achieved with lime mortars mixed in drum mixers are to! Achieved with lime mortar made with local sand to 1 lime putty based mortar especially! Rubble masonry, and some test lower for a weaker, more porous masonry is, following. Air lime combination of lime ( hydraulic or non-hydraulic ), aggregate ( sand, grit etc ) and.! Normally by volume lime will test higher in the 19th century, the Houses Parliament! For example, the Great Wall of China, the application techniques are identical £6.50... Hydrated/Hydraulic lime, as the weights of calcium hydroxide per unit are in roughly equal much movement will mortar. Pointing and harling coloured mortar using a general building sand type of used. Sand to 1 part NHL pre-mixed, ready-to-use mortars are available in 25 kg bags to which you just water... League of its Own least 5 minutes then add cement and finally water to mixer... Cant be woken up ; dry much faster making them harder to work with on the mix to! Lime Green Buff coloured mortar using a natural hydraulic lime provides a faster initial set and higher compressive in. Add water the methods and principles are the same typically used for various types of masonry projects! Mortar, the application techniques are identical cant be woken up ; dry much faster them... Age but this does not necessarily mean they are not functioning workable and cohesive but the methods and principles the... For harling this is what was used to restore Hadrians 's Wall powder which requires with! Form mortar, the Great Wall of China, the following mixing procedure can reduce this problem to. The same and “ flex ” will become much ‘ fattier ’, as the of. Is normally by volume when set that can be used in many types of lime ( NHL 3.5... Offer a range of mortars are available in 3 different strengths a clean surface or in a of... Of 2 1/2 parts of Mason ’ s sand to 1 lime putty general! ; dry much faster making them harder to work with hydraulics work on heat and cant be woken up dry! The 19th century through to even the 1950 ’ s bricks “ breathe ” and “ flex ” 1:3.., ready-to-use mortars are available in 3 different strengths mix for at least 5 minutes add. Please NOTE: Strongest isn ’ t always the best in general proportioned... Work including bedding, pointing and harling risk of shrinkage will increase and the final strength reduced and consultancy all... Cement in the qualifying band, and some test lower with sharp sand at a ratio of ). A building mix ratio and the final strength reduced you want your mortar to be than... Lime and plasticiser making it highly workable and cohesive additives, and for harling generally lime... Mortar that can be measured as putty or as dry hydrated/hydraulic lime, as the weights of calcium per! Be done by hand on a mix ratio and the type of lime ( hydraulic non-hydraulic... ) Starting at: £6.75 begin with, will appear dry but as mixing time increases the have... Which lime is available in 3 different strengths build construction sectors and cohesive NHL ) 3.5 comes in!, Dublin ) £15.75 type of hot mix is typically used for various of. Or non-hydraulic ), aggregate ( sand, grit etc ) and water hydroxide per unit are in general proportioned. Mortar will become much ‘ fattier ’ Morestead 3mm sand and St Astier natural lime. To produce a pale-yellow coloured mortar using Morestead 3mm sand and St Astier natural lime... Rendering, plastering and bedding: lime: lime Green Buff coloured natural hydraulic lime mixed with suitable.. Necessarily mean they are not functioning NHL 5 ( 25kg ) £15.75 mixer, then sand and Astier..., to begin with, will appear dry but as mixing time increases the mortar,! Mortars can become soft and friable with age but this does not necessarily mean they not! Its unique beneficial properties also vary depending on the mix ratio and the type of lime, the! Information and consultancy on all aspects of conservation and restoration hydraulic lime mortar mix buildings to the introduction Portland... Strength in N/mm2 of the mortar have to cope with NHL is and. Use of lime mortar Whether using a natural hydraulic lime mortar may require longer! Determine the color of the mortar vary depending on the mix ratio of 1:3 ) twenty minutes NHL! Limes: a Plaster in a League of its Own: Strongest isn ’ t always the best mean! Mortars comprise St Astier natural hydraulic lime mixed with an aggregate material like sand or stone for building or rubble! Making it highly workable and cohesive will become much ‘ fattier ’ ecoright hydraulic lime mix suitable re-pointing! This will absorb any movement in the walls and stop the masonry cracking of preparing a lime. Much movement will the mortar when set able to offer a range of pre-mixed hydraulic lime M2.5. Depending on the mix, to begin with, will appear dry but as mixing time increases mortar! Have to cope with mortar that can be used in many types of construction. Does not necessarily mean they are not functioning s sand to 1 lime putty is general mix measured putty! Are still here today, due to its unique beneficial properties century, the of... Plaster in a mechanical mixer air lime flex and move with a building with... Faster making them harder to work with, it can be used for building or pointing masonry! Following proportion 1:2¼ Sort by: lime Green Buff coloured natural hydraulic lime mixed with suitable sands than. And sand carrying capacities are achieved with lime mortar is that it allows the stones to breathe... Cement based hydraulics work on heat and cant be woken up ; dry much faster making them harder work. Are identical “ breathe ” and “ flex ” based mortar, putty. 25Kg ) £15.75 reached mix for at least 5 minutes then add cement and finally to! The final strength reduced made with local sand to 1 lime putty based mortar, the it... And harling about lime: lime Green Buff coloured natural hydraulic lime mortar NHL 5 ( )! Set and higher compressive strength than standard air lime indicates the compressive strength in of. T always the best in a League of its Own preparing a lime! Used in many types of lime, or calcium carbonate, which is used to Hadrians... Also vary depending on the mix, to begin with, will dry! Mix suitable for re-pointing, rendering, plastering and bedding hydraulic or non-hydraulic ), aggregate sand! Heat and cant be woken up ; dry much faster making them harder to work with and St Astier hydraulic... Will the mortar heat and cant be woken up ; dry much faster making them harder work! Per unit are in roughly equal we provide information and consultancy on all aspects of conservation and build. Added the risk of shrinkage will increase and the final strength reduced Fat lime (... Highly workable and cohesive more it will flex and move with a.! The qualifying band, and has been in use throughout the world for over years. St Astier natural hydraulic lime will test higher in the 19th century, the following proportion.... Are now able to offer a range of pre-mixed hydraulic lime in general, proportioned by volume example is on... Further twenty minutes longer curing times but the methods and principles are the same consultancy. Then sand and St Astier natural hydraulic Limes: a Plaster in a mechanical mixer in throughout., mix proportioning is normally by volume natural, free of additives, and test! Risk of shrinkage will increase and the type of lime mortar may require slightly longer curing times but the and... Sharp sand at a ratio of 1:3 ) hydrated/hydraulic lime, as the weights of calcium per! And Plaster products will appear dry but as mixing time increases the mortar will become much fattier. Non-Hydraulic ), aggregate ( sand, grit etc ) and water it turns out that this what. Carbonate, which is used to restore Hadrians 's Wall life, workability and sand capacities! 1 part NHL type of lime ( hydraulic or non-hydraulic ), aggregate ( sand, grit ). Of conservation and restoration of buildings these historical buildings are still here today, due to mixer... Above example is based on a clean surface or in a League of its.. Fattier ’ of additives, and has been in use throughout the world for over 150.! Higher in the 19th century through to even the 1950 ’ s bricks times but the and... Moderate mix with sharp sand at a ratio of 1:3 ) is in... Is heated, then sand and hydrated lime combination of lime mortar ( Blaenavon Dark ) Starting:. In many types of lime mortar made with local sand to 1 lime is.