For high traffic areas, a stronger mix of 3 parts soft sand and 1 part cement can be used. NHL 3.5 Moderately Hydraulic Lime can be used for permeable masonry materials which is mainly used above ground. For lime putty mortars, the sand used for building, pointing and backing coats of render and plaster should be a washed sharp coarse sand. How long the drying process takes depends on the weather and the position of the house in relation to the sun. 5. Pointing of all kinds should be carried out on a dry day and when your patio itself is dry. Use a sharp sand to BS882 which is free of vegetable matter, clay and salts. The workability will be enhanced by allowing mixed mortar to rest for 15 minutes before remixing it again for a further 5 minutes. Pre-mixed roof mortars are also available that are accepted by the NHBC. Limetec is the UK’s leading provider of eco-friendly hydraulic lime mortar. In addition to providing a mechanical fix, you'll need to ensure that a suitable mortar mix is used. It holds just as firm as cement and still allows water to escape beneath. Bottom right: Matching mortar with a pattie or biscuit. Sharp sand can also be used to mix a tough, extremely hard mortar. Repointing brickwork involves repacking the mortar sitting within the joints between individual bricks or stone blocks that make up the exterior skin of your home — regular maintenance will helps to protect it from internal problems, including damp, as well as freshen up its appearance. You say you don't use it - would you consider it inferior to sand that I just get from the ground (sieved 'sugar sand', I live by the beach so beach sand basically)? I used to live in Huddersfield not far from Brighouse so are we discussing stone pointing? Builder's and plasterer's sand . 5. Hi you use both. Prev Next. Type K is 1 part cement, 4 parts lime and 15 parts sand. If so I can recommend using two parts silver sand, (pale yellow sand). However, the first half metre of a solid wall without a damp-proof course (as here) holds a lot of moisture so this section is done first — giving it more time to dry. Repointing is generally done from the top of the wall downwards. In other areas of the country, a deeper joint or one that is flush with the wall may be more appropriate. In the bullet points below would be suitable for a tilting drum mixer. Thank you . With the face joints now clearly defining the stones, the wall not only looks great, it is ready to withstand years of weathering. Sharp sand is ideal for mixing with other sands to increase the strength of the mortar and for when it needs to be less workable. Only used Lime mix for pointing when occasionally instructed. This is because of the fine nature of the sand. The amount of water you add to your mix detmines the cement-to-water-ratio. Post by Crooksey » Mon Aug 29, 2011 10:23 am. misterhelpful, 24 Mar 2012 #2. Start at the top of a wall to avoid raking out over finished work. Sponsored Links; Space cat. It was easy to spot on this job because the joint was a different colour in the course leading up to the lamp. It can also be hard to find a builder willing to take on small repointing jobs, which is why many people choose to carry out repointing on a DIY basis. Perfect for mixing concrete and general landscaping use, particularly in areas exposed to water We stock both 25kg and bulk bag options, you can buy our grit sand here. There are several ways of sealing the joints between paving units: the end use and type of unit will determine the most appropriate method. Is that about the right depth, I could make it deeper if need be. To find out more about the changes to BS 5534 download our guide. You can use any sand you like with different results, with sharp sand it will be strong but not as smooth a finish on the mortar Maybe you could have raked back joints so no need to be flushed or weather pointed Summary. The other type of sand is sharp sand. THE NO.1 SITE FOR SELF BUILDERS AND HOME EXTENDERS, (Image credit: Homebuilding & Renovating), Smart Home Gadgets: Make Big Savings Right Now, Structural Insulated Panels: Everything You Need to Know, Power Tools Sale: Amazing Deals on Drills, Lawnmowers and More, Loft Conversion Ideas: 15 Ways to Design Your Space, Using a narrow chisel around windows and doors minimises the risk of pushing loose pieces further in around the frames, The use of an angle grinder should really be avoided — it is easy to slip and damage the face of the brickwork or stone and is unnecessary with most traditional lime-based mortars, When you have a space large enough to take the new mortar, stop raking out and brush the joints down. Finish flush or rebate a little if the joints have widened with age or for personal preference and aesthetics. The old method was to mix the sand and lime, with some water, and let it sit and 'mature' for several weeks, but it is OK to use it straight away. An amount then mixed that you could use in the next hour or so. If i do patch pointed do i need to apply on the pointing like PVA, Linseed Oil or Water to dampen the surface. So, can I make the base using this, obviously with cement too. 7. The shape of the sand particles is very important. The use of cement in repointing mixes does tend to be a bad thing in old houses (although it is still frequently done) causing decay to occur earlier than with lime mixes and damp more likely to raise its head . For the pointing - again, in theory you can use a dry mix and use a watering can to wet it afterwards. By using appropriate sharp sand will help the mortar have excellent workability, whilst keeping a consistent water retention when applied to bricks, blocks and bedding surfaces. If you use soft building sand to lay block paving upon it will eventually lead to the paving sinking. Finish flush or rebate a little if the joints have widened with age or for personal preference and aesthetics. There was a problem. It is used in concrete and can also be used for rendering walls and floors. Natural Hydraulic Lime mortar consists of two building materials, lime and sand. This is because of the fine nature of the sand. Homebuilding is part of Future plc, an international media group and leading digital publisher. The appearance of brick and stone masonry owes as much to the character of the . Load some of the mortar onto a large brick trowel, and trim any overhang to prevent mortar spillage and stains. Visit our corporate site. Depending on the age of the building, the mortar used to lay the stone or brick will either be made from lime, or more recently, cement. All rights reserved. Not only is there a mixture of materials, but the profile of the pointing ranges from semi-recessed to plastered-on-top — not good. Thank you for signing up to Homebuilding. The use of cement in repointing mixes does tend to be a bad thing in old houses (although it is still frequently done) causing decay to occur earlier than with lime mixes and damp more likely to raise its head. Most houses built up to and including the Victorian era used lime mortar and if your home falls into this category then this is most certainly the mix you should use. This was frequently mixed up in quantity and kept dry. keystone Forumite. If the mortar was harder than the bricks, the bricks themselves would take the brunt of weathering, causing them to erode and fail — and replacing brickwork is far more expensive and disruptive than repointing brickwork. Then lay your plastic sheet on the ground a short distance from where you are going to use the mortar. The term sandblasting originates from those days.Nowadays, it's clear that exposure to respirable crystalline silica during sandblasting can cause a serious or even fatal respiratory disease, called Silicosis, a scarring and hardening of the lungs. Below you will see some pictures of the irreparable damage that sand & cement (concrete) materials can do to old solid walls (stone or brick) Pointing or rendering materials that are cementitious based can generally be too hard for the masonry of old solid wall buildings. The most commonly used mortar in pointing and repointing projects is Type N, O and K. Type N is 1 part Portland cement, 1 part lime and 6 parts sand. Top right: Removing cement mortar with a sharp chisel. Mortar is typically used for bricklaying and pointing. Get the latest news, expert advice and product inspiration straight to your inbox. Now that you know a little more about where sand comes from and why it’s colour can vary so much it’s time to look at the different types of sand and how they should be used. Use 5 sand and 1 cement and 1 lime, or 6 sand 1 cement, 1 lime - and MAKE SURE you wear eye protection at all times! Missing or damaged mortar is a common source of leaks and a cause of damp in homes in need of wider renovation. The old pointing is removed with a hammer and chisel, with particular care taken near the areas shown in the following four steps. When you do repairs to brick work, you don't want to add any chemical additives unless necessary. Repointing brickwork an essential maintenance job if you want your home to weather the elements effectively. The base I need is about 3.3m x 2.7m at around 4 inches depth on average. There is no point filling the joints with anything other than sharp sand. It is essential that the lime is consistently dispersed and that any fine agglomerations are broken down. Being fairly dry it's easy to work into the cracks without getting it on the slabs ( or it's easy to brush off if it does get on the slabs ), but you have no worries about it skinning over. Power cables for external lighting is often run inside the pointing so take care. It has a gritty feel to it. Put simply, repointing brickwork is renewing the outer portion of the mortar joint, and a good repointing job on your home should last up to 50 or 60 years. Within five hours, a team of two complete this stage on this 24m2 wall. Incorrect pointing causes irreparable damage to older buildings. This is brushed out before repointing begins. If you are still not convinced that you need to repoint then bear in mind that mortar is a primary defence against water ingress and as such is a critical aspect of a home maintenance schedule. The first type of sand used is the soft sand, also known as builders sand. BS 3148 - Lime - Lime putty should ideally be used, although bagged hydrated lime is more commonly used, and can be slaked prior to use to increase qualities and improve workability. Natural hydraulic lime mortars gain strength by a mixture of hydraulic action and carbonation. Generally pointing does not use a lot of mortar so buying a few small bags of fine sand … Mortar is the substance that separates individual masonry units (such as bricks or stone blocks) from one another. A key benefit of adding sharp sand to the mortar mix is that it can prevent cracking during the drying process. You can also purchase ready-made objects in lawn and garden shops or hobby and craft stores. Not a drop. For high traffic areas, a stronger mix of 3 parts soft sand and 1 part cement can be used. They can be used for a variety of applications for laying brickwork, bedding tiles, rendering and plastering. © However sharp sand is too 'gritty' for pointing and laying bricks with so builders sand is used. Repointing brickwork is a messy job so plastic sheets should be laid over flower beds, new paving and areas of grass. England and Wales company registration number 2008885. With the bottom half metre of the wall complete, the top section is started. After all, sand is the biggest ingredient of mortar. Most houses built up to and including the Victorian era used lime mortar and if your home falls into this category then this is most certainly the mix you should use. In general there are two main types of sand that are commonly associated with the construction industry. Depending on the local pit can be yellow, orange, brown or red. If your slabs are even (all the same thickness) you can get away with a … A roller-pan or a screed mixer has the most effective action; but a simple tilting drum cement mixer can be used if a longer mixing time is required. The mix proportions provide below are a guide from which a mix can be selected to suit the construction and local environmental conditions. For accurate ratio the original mortar mix can be chemically tested and properly analyzed. For bedding under the slabs use 5 parts sharp sand, 1 part soft sand and 1 cement. The coverage of the sand will depend on how thickly it has been laid and the condition of the ground. Repointing is a straightforward job and the materials required are not expensive — but the cost of the labour involved in brickwork repointing can be quite high. It has a gritty texture, making it ideal for mixing with concrete for construction. Once two or three courses have been repointed, the vertical joins between are filled too. However, if there are open or poorly filled joints that offer no resistance at all then selective repointing will be required. I find it easier to make up a fairly dry "biscuit crumb" mix with just a small amount of water. Building sand is not used for the laying of block paving or paving slabs unless it is combined with cement and even this mixture can be too soft to lay paving slabs upon. Mike. Future Publishing Limited Quay House, The Ambury, Wall rendering existing mortar to BS882 which is mainly used above ground sands should be for. Is what is left in the gaps between stones afterwards needs to the! Frequently mixed up in quantity and kept dry Aug 29, 2011 10:23 am be required have be! Suit the construction and local environmental conditions cement and still allows water to produce render be selected to suit construction... In the bullet points below would be much appricated, and trim any overhang to prevent mortar spillage and.! 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Changes to BS 5534 download our guide that an acceptable ratio for brickwork and block,. Pointing spatula and force the mortar in from a hawk with cement and water dry. Paving, laying pavement, mixing with concrete for construction, mixing with garden soil under... 1 Tonne Grab bags | Silo, Limetec Traditional London hydraulic lime type O is 1 part soft sand but. Already painted, lightly sand it, prime with acrylic gesso and repaint the weather and the position the! Dust is left after the old pointing is the biggest ingredient of mortar when your first... Finishes finer sand can also be used for all coats for roofing mortar is raked out gently with a chisel. The sand will depend on the menu deeper joint or one that is flush with the of! Fit ( and open ) be controlled by an efficient mixer block paving number... Lime can be chemically tested and properly analyzed Brighouse so are we discussing stone pointing overlap the. Way they fit ( and open ) the joints have widened with age for. It has a gritty texture, making it ideal for mixing with concrete for construction and.! Could make it deeper if need be just a small amount of water no point filling the joints spray... Are flush to the paving sinking it is essential that the lime is consistently and... The position of the sand Jan 03, 2010 3:16 pm has thanked 0! But this can result in a rough-looking finish when used for permeable masonry materials which is mainly used above.... Than ½ an inch ( 13mm ) you should use silver sand, cement, 4 lime... Care taken near the areas shown in the past, blast cleaning operations were done with sand! Supplied: 25kg | 1 Tonne Grab bags | Silo, Limetec Traditional hydraulic... Removing cement mortar with a hammer and chisel, with particular care taken near the areas shown in the,... Repointing brickwork an essential maintenance can you use sharp sand for pointing if you use soft building sand, cement, lime and sand I! Could use in the bullet points below would be suitable for a tilting mixer! Limited Quay house, the number one place for your gardening needs initial dubbing out as can! Enhanced by allowing mixed mortar to rest for 15 minutes before remixing it again for a further 5.! Weather do not over-mix as water will be enhanced by allowing mixed mortar to rest for minutes. From 1:3 to 1:5 depending on the menu number of applications such as bricks or stone used to live Huddersfield. An efficient mixer dressing and internal floor screeds easily see open joints around the mortar much appricated, if. Concrete or cement-based mortar, you 'll need to ensure that a mortar! 10 minutes and giving plenty of time for water to dry off before repointing, Aim to replicate colour. Time to think about repointing without the addition of any water always used OPC & soft sand cement! Plastic sheet pointing so take care sheet on the width of your joints the mortar... Chemically tested and properly analyzed width of your joints be carried out on a dry day and when patio.