Description. Read more about lime: Lime: The Civilized Plaster Natural Hydraulic Limes: A Plaster in a League of its Own. The proposed repair mortar and plaster consist of natural hydraulic lime as binding material, while aggregates of siliceous sand and crushed brick are used. Hydraulic lime is a type of lime, or calcium carbonate, which is used to make mortar and plaster products. A natural hydraulic lime mortar made with NHL2 will be weaker than one made with NHL3.5 but more durable than a lime putty mortar. Limelite NHL 3,5, a moderately hydraulic lime suitable for general-purpose use for mortar/pointing/rendering of most masonry types. Lime Mortar products available from a range of brands, St Astier, Singleton Birch, and Lime Green, which come in different strengths such as NHL 2, NHL 3.5 and NHL 5. Pre-mixing is obviously unnecessary when purchased as a ready to use mortar. Generally, lime mortar mix ratio for brickwork ranges from 1:3 to 1:5 depending on the strength. Non-hydraulic lime, as well as feebly hydraulic lime, can perform better than any other, in the right hands, for conservation, for many internal locations or for sheltered summer work. THE HERITAGE RANGE 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 is composed of lime (hydraulic, or non hydraulic), water and an aggregate such as sand. Generally hydraulic lime provides a faster initial set and higher compressive strength than standard air lime. Lime mortars could be replaced with cement mortars. Once this mixture is blended with water to form mortar, it can be used in many types of masonry construction projects. TF021. £1.20 – £217.60 . Natural hydraulic lime mortars gain strength by a mixture of hydraulic action and carbonation. Lime-sand mortar. Our range includes: Natural Hydraulic Lime, Lime Products, Lime Mortar, Sustainable Paint Systems, Training & … The lime is heated, then mixed with an aggregate material like sand or stone. TF011. This then turns the mortar to an FHL (Formulated Hydraulic Lime) as oppose to an NHL (Natural H ydraulic Lime). Saint Astier EcoMortar R (25kg) From: £17.80. Available in NHL2 NHL3.5 or NHL5. Site-made mortar Pre-Mixed Fat Lime Mortar (Caernarfon) Starting at: £4.00 . Saint-Astier® NHL is pure and natural, free of additives, and has been in use throughout the world for over 150 years. The repair mortar shows similar pore-size distribution and capillary absorption coefficient with both the original mortar and stone. Lime Mortar for building, conservation and renovation. Uses of lime mortar: Fats lime mortars can be used in all types of foundation work that is in dry subgrade i.e. Please select a mortar colour: TF004. £14.76 inc. VAT. A dry powder which requires mixing with water on site. Lime mortar today is primarily used in the conservation of existing old buildings or the recreation of new ones using traditional methods. 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. HLM will also vary depending on the ratio of lime binder to aggregate and the type of aggregate or sand used. Lime plaster with high adherence and excellent breathability. Some NHL will test higher in the qualifying band, and some will test lower. Natural Hydraulic Lime (NHL) has been produced in Saint Astier since 30 BC and produced on an industrial scale since 1851. 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. Lime-sand mortars are a factory produced mixture of damp sand and hydrated lime delivered to site in specified proportions, to which cement, additives and water are added in a mixer prior to use. Hydraulic lime (HL) is a general term for varieties of lime (calcium oxide), which set through hydration.This contrasts with varieties of air lime slaked lime (calcium hydroxide), used to make lime mortar, the other common types of lime mortar, which set through carbonation (re-absorbing carbon dioxide (CO 2) from the air). Quicklime can be combined with a natural hydraulic lime (NHL) to produce a gauged mortar. Our Lime Mortar & other binders are made from St. Astier Natural Hydraulic Lime. Hi. TF020. Allow 30 minutes for a natural hydraulic lime mortar compared to up to a week for lime putty mortar. Traditional mortars derived from Scottish limestones were often slightly hydraulic. Lime Mortar Mix Ratio. Suitable for building restoration and conservation. Please choose the type of premixed hydraulic mortar. Roundtower lime provides a range of products in addition to information resources on Lime. The beauty of lime mortar is that it allows the stones to “breathe” and “flex”. Saint-Astier® Natural Hydraulic Lime. Hydraulic lime provides a faster initial set and greater compressive strength compared to non-hydraulic lime and will set in more extreme conditions including under water. £21.36 inc. VAT. The characteristics of the raw materials are unique and consist of an undisturbed layer of calcareous rock infiltrated mainly by silica with only traces of other minerals. 1. Do you require paint? 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. natural hydraulic lime nhl 2 Particularly suitable for interior and exterior use on weak structures. TF070. We recommend this product for historic structures built with harder brick or stone. View Details. Hydraulic lime can be used to produce different products such as; bedding or repointing mortars, renders, injection grouts, lime paint, etc. Pre-Mixed Non-Hydraulic Lime Mortars. As well a range of lime putty products. Protection: TF078. This time-honored product is enjoying a modern comeback due to its performance and beauty. mortars and renders). water table 2.4 meters under the foundation level. Roundtower Natural Hydraulic Limes are natural products that contain no additives and are not blended. A non hydraulic (lime putty) mortar is always a better choice for soft or cob bricks. 215-536-6706 Lime mortar made with local sand to produce a pale-yellow coloured mortar using Morestead 3mm sand and St Astier natural hydraulic lime. The use of FHL has been around since the Romans who used volcanic ash to formulate the lime when building the Colosseum, this adds extra strength to the mortar, but does slightly lower the breathability and flexibility. For softer bricks the lime can changed to NHL2. The proportioning and mixing guide for site-made mortar also applies to lime-sand mortar. Stones are naturally porous as well. Yes No. Used in conservation work where the existing masonry has deteriorated, was originally built with a weak mortar or where the structure was built using soft materials. ” To be our customers first choice for hydraulic lime mortars and lime based products and to provide an excellent customer experience. Natural Hydraulic Lime (NHL) 3.5, by Roundtower , is a strong mortar option with all the flexibility that comes with natural lime. 3. Bricks of the 19th century through to even the 1950’s are more porous than today’s bricks. Heritage Mortar NHL2 NHL3.5 & NHL5. When you’re ready to carry out the work, the mortar is “knocked up” (agitated/mixed) immediately prior to use to plasticise the mix and help to reduce shrinkage. Lime putty should be matured, in excess of one month, wet stored with aggregates or blended in a mortar mill with aggregates. Using hydraulic lime in mortar mixes gives a very nice workability, good elasticity, high permeability, excellent resistance to salts and self healing properties. Fats lime and hydraulic lime are both appropriate for all masonry works. Hydraulic quicklime is not readily available in the UK, so gauging an NHL with quicklime is the closest you will usually get to a traditional hydraulic hot lime mortar. Sort by. ... Pre-Mixed Fat Lime Mortar (Red Sandstone) Starting at: £4.75 . Natural Hydraulic Lime (NHL) Saint Astier® pure and natural hydraulic limes (NHL) have been in production for over 150 years. 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. 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. TF082. It is important to be careful with the mix proportions of mortars. Hydraulic Lime. Remember the mortar must be softer than the brick or stone it is matched with! Please select the type of hydraulic lime. Coarse Stuff - Lime Putty Mortar… Lime Green Chalk Coloured Natural Hydraulic Lime Mortar NHL 3.5 (25kg) £12.30. Medium Stuff - Lime Putty Mortar. TF024. Natural Hydraulic Lime, or "NHL" is a traditional material which combines some of the characteristics of ordinary lime with the more positive, through-setting characteristics of cement.It is produced by burning limestone that has naturally-occuring clay or silica impurities and then slaking to produce a fine powder. Natural hydraulic lime, is an odourless powder, when mixed with sand and water it becomes a binder for building applications (e.g. A standard spec for an NHL3.5 mortar in medium bricks and stone could be 1 part St Astier NHL3.5 to 2.5 parts well graded sharp sand. Lime mortar basically falls into two main catagories; 'Pure' lime is that which has been produced with no impurities and is reliant on good drying conditions for a 'set' to be acheived (often sold as lime putty)and hydraulic lime is basically the same, but with impurities within the fiished lime in … Hydraulic lime is made from an impure limestone and sets through hydrolysis, a reaction caused by water. 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