Bricks of the 19th century through to even the 1950’s are more porous than today’s bricks. The number indicates the compressive strength in N/mm2 of the mortar when set. We are providers of natural hydraulic limes, lime putties and traditional building tools & accessories, used especially for the conservation and restoration of buildings. Strength will also vary depending on the mix ratio and the type of aggregate used. 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). 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. Roundtower Lime are a supplier of premium lime products to the conservation and eco build construction sectors. The mix, to begin with, will appear dry but as mixing time increases the mortar will become much ‘fattier’. Cement based hydraulics work on heat and cant be woken up; dry much faster making them harder to work with. Pre-Mixed Fat Lime Mortar (Blaenavon) Starting at: £6.50 . The new Cornerstone range of mortars are available in 25 kg bags to which you just add water. Read more about lime: Lime: The Civilized Plaster Natural Hydraulic Limes: A Plaster in a League of its Own. THE HERITAGE RANGE Buff coloured NHL 5 lime mortar. There are two main methods of preparing a hot-mixed lime mortar. Mixing should either be done by hand on a clean surface or in a mechanical mixer. This type of hot mix is typically used for building or pointing rubble masonry, and for harling. Lime pointing of traditional masonry using lime mortar based on lime putty or natural hydraulic lime (NHL) offers many advantages over cement based mortars. 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. This will absorb any movement in the walls and stop the masonry cracking. Remember the color of the sand will largely determine the color of the mortar! Available in NHL2 NHL3.5 or NHL5. Both produce a mortar that can be used for various types of lime work including bedding, pointing and harling. It contains hydrated lime and plasticiser making it highly workable and cohesive. Method 1: Hot lime mortar. Saint-Astier® Natural Hydraulic Lime. Lime mortars mixed in drum mixers are prone to balling. 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. Pre-Mixed Fat Lime Mortar (Rhondda) ... Pre-Mixed Fat Lime Mortar (Blaenavon Dark) Starting at: £6.75 . For accuracy, use buckets or gauge boxes rather than shovels. These mortars comprise St Astier natural hydraulic lime mixed with suitable sands. It turns out that this is what was used to restore Hadrians's Wall! And add our pigments for even more color variations! Sort By. 11 Item(s) Show. By following the proper mixing procedures, excellent board life, workability and sand carrying capacities are achieved with lime mortars. 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. POINTING WITH LIME MORTAR Whether using a natural hydraulic lime or a lime putty based mortar, the application techniques are identical. Carefully choose which lime is most appropriate for the situation, selecting a weaker mix for a weaker, more porous masonry. View Details. These historical buildings are still here today, due to its unique beneficial properties. Add some water to the mixer, then sand and hydrated lime. 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. (The above example is based on a mix ratio of 1:3). Non-hydraulic mortar can be woken up. The lime is heated, then mixed with an aggregate material like sand or stone. Some natural hydraulic lime will test higher in the qualifying band, and some test lower. Heritage Mortar NHL2 NHL3.5 & NHL5. The beauty of lime mortar is that it allows the stones to “breathe” and “flex”. Lime mortar is a combination of lime (hydraulic or non-hydraulic), aggregate (sand, grit etc) and water. 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. 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. Saint-Astier® NHL is pure and natural, free of additives, and has been in use throughout the world for over 150 years. EcoRight Hydraulic Lime Mortar M2.5 This is known as a moderate mix with the following proportion 1:2¼. Set Descending Direction. Sand colour will determine the colour. 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. A dry powder which requires mixing with water on site. We provide information and consultancy on all aspects of conservation and restoration of buildings. 1. Pre-mix Hydraulic Lime Mortar - Lincolnshire Lime. 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. 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. Mix for at least 5 minutes then add cement and finally water to adjust the workability. Preparation of the mix. 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. The less hydraulic a lime is, the more it will flex and move with a building. For site-made mortars, mix proportioning is normally by volume. We are now able to offer a range of pre-mixed hydraulic lime mix suitable for re-pointing, rendering, plastering and bedding. A lime:sand mortar mix may be produced by either: These mixes do give you a buff coloured mortar using a general building sand. Once the desired consistency is reached mix for a further twenty minutes. For example, the Great Wall of China, the Houses of Parliament and Rome Colosseum. Hydraulic lime is a type of lime, or calcium carbonate, which is used to make mortar and plaster products. Due to the introduction of Portland Cement in the 19th Century, the use of lime declined. View Details. Pre-Mixed Fat Lime Mortar (Cheshire) Starting at: £4.75 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). However, the following mixing procedure can reduce this problem You want your mortar to be softer than the masonry. 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. Lime mortar may require slightly longer curing times but the methods and principles are the same. I've done another hour or two's searching, and I think I might be fine with some kind of portland & hydraulic lime mortar. Stones are naturally porous as well. Site-made mortar. Natural Hydraulic Lime is available in 3 different strengths. Lime mortar made with local sand to produce a pale-yellow coloured mortar using Morestead 3mm sand and St Astier natural hydraulic lime. Products Sort by: Lime Green Buff Coloured Natural Hydraulic Lime Mortar NHL 5 (25kg) £15.75. PLEASE NOTE: Strongest isn’t always the best. £18.90 inc. VAT. Why use hydraulic lime mortar? 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. Mix with sharp sand at a ratio of 2 1/2 parts of Mason’s sand to 1 part NHL. Lime mortar, especially putty lime mortars can become soft and friable with age but this does not necessarily mean they are not functioning. Pre-mixed hydraulic lime mortar. The strength of a hydraulic lime mortar varies depending on the manufacturer of the hydraulic lime. Natural Hydraulic Lime (NHL) 3.5 comes dry in 55 pound bags with no artificial additives. If too much water is added the risk of shrinkage will increase and the final strength reduced. 3 sand to 1 Lime putty is general mix. 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. 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. Once this mixture is blended with water to form mortar, it can be used in many types of masonry construction projects. If not purchasing a pre-mixed mortar … How much movement will the mortar have to cope with? If anyone wants to know more about this then just google "The hydraulic lime pointing mix contained a 'trowel full' of ordinary". Lime can be measured as putty or as dry hydrated/hydraulic lime, as the weights of calcium hydroxide per unit are in roughly equal. 7. Generally hydraulic lime provides a faster initial set and higher compressive strength than standard air lime. Mortar mixes are in general, proportioned by volume. Pre-Mixed Non-Hydraulic Lime Mortars. 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. 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. Pre-mixed, ready-to-use mortars are also available as BioMix 35. Welcome to The Lime Store, Dublin. You want your mortar to be softer than the masonry pound bags with no additives! 3 different strengths achieved with lime mortars and Rome Colosseum is normally by volume new! 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