The lime adds some flexibility. Estimate mortar quantity for building and bedding with bricks or blocks. There are two main methods of constructing a flint wall: 1. Dry powder lime mortar: Heritage Mortar / NHL & Natural Mortar /NHL 25kg bag will repoint 3 to 4 m2 brickwork or lay approx. A 3.5:1 mix of coarse sharp sand and lime putty is often used, sometimes with a pozzolan added. As lime mortar is generally softer than stone, occasional repointing is necessary at both low level (due to salt attack) and at higher levels like copings, string and weathering’s (due to water erosion). The entire wall is constructed using flint rubble (this relies upon timber shuttering being constructed either side of the wall to hold until the mortar goes off). Flint Walls Flint is an impervious material that is very hard, but it does not need to be set in a very strong mortar. Lime is also a natural fungicide, so the wall will remain looking better for longer. Most buildings of any age will be constructed using lime mortar & the mix of this mortar will often blend with that of the flint work. It allows moisture to evaporate and walls to breathe. The amount of pozzolan added will vary according to the hardness of the masonry and the degree of exposure of a site. Type N mortar used for reinforced interior and above-grade exterior load-bearing walls on which normal loads are imposed. The wall is distorted out of shape a certain amount and has been the subject of previous repairs. In recent building-site history, mixing mortar has become a job for the general labourer, despite often being unqualified and poorly skilled. Knapped flints are nodules split to achieve a deliberate aesthetic effect rather than those simply fractured, ie broken naturally or crudely severed to reduce them to a convenient size. It is more expensive than using Portland cement, but if you have taken the time to use lime with the house, it would be a shame not to have a matching wall. The mixing is different (mix ratios, no admixtures etc.) and the aftercare/curing requires more as lime pointing needs to be tamped/beaten back with a stiff brush as this action removes excess mortar and sets the mortar into the joint. thanks Mike The Myth in the Mix The 1:3 ratio of lime to sand Gerard Lynch. This is huge shame as, when done well, repointing brickwork is a job that can really enhance a home, despite its seeming insignificance. There also appears to be a few globs of modern portland cement in a couple of spots. This is known as galleting. For bedding under the slabs use 5 parts sharp sand, 1 part soft sand and 1 cement. Flint, knapped or unknapped, has been used from antiquity (for example at the Late Roman fort of Burgh Castle in Norfolk) up to the present day as a material for building stone walls, using lime mortar, and often combined with other available stone or brick rubble. Suppliers of Lime Mortar, Lime Plaster & Building Conservation Materials 01642 430 099. Those are the dark grey patches at the lower right hand side and along the base of the wall. This is a section of brick and flint wall at the front of North Lodge of approximately 1600mm height. The curing time of lime is longer than that of cement and if the area/wall is exposed to weathering it needs to be protected sufficiently. Hope this helps. and Repair of Flint Walls”, Technical Pamphlet 16, with kind permission of the Society for the Protection of Ancient Buildings. With yet others it’s a 50/50 mix. Mortar Calculator . There are four main types of mortar mix: N, O, S, and M. Each type is mixed with a different ratio of cement, lime, and sand to produce specific performance characteristics such as flexibility, bonding properties, and compressive strength. 15. Home Work Services Flint Types Team Blog Contact. The lime mortar should always be softer than the stone and generally I use a 4:1 mix. There is no trowel work at all, the pointing being achieved by gloved hands and a stiff brush when ready. Type O Mortar. Here at Sussex Lime Plastering we can take a sample of your mortar and have it analysed to get as close to the original mortar as possible. 14. Render Mortar Mix (Modern Buildings) Colour Chart. A stone wall can give your garden timeless appeal. Home Work Services Flint Types Team Blog Contact. Lime mortar is weaker than bricks, masonry and stones, yet it is able to support the full weight of a structure, allowing buildings to flex and move. We use traditional methods & materials such as lime mortar to cater for specific conservation requirements. Our skilled craftsmen used a lime mortar mix with new flint and stone work to match in with the conservation area. This mortar joint has been given a convex v-shaped profile referred to as a beak or double truck joint. Flint work specialists. Judging by the second image, the original mortar appears to be a lime based mix. It clearly indicates how easy the Point Master makes this previously highly difficult job. Strong cement mortar is wrong to use, as the water that enters the wall through tiny cracks will not be able to dry out. Speaking as the owner of a very large flint wall (Listed GII), we had to rebuild a section which was demolished by a tree. This is not normally used now. It is a low strength mortar with minimum 2.5 MPa (350 psi). (at least that was how i was taught) It might also make things harder when you come to "stick" the flints at the end of the day ( *stick* - finish the flint work, like jointing brickwork) In fact, many people still consider lime mortar to be superior to many types of modern mortar mixes. ProjectsListed Flint Stone Wall in Chichester. The correct mortar mix varies between structures, but the general rule of thumb is that the mortar should be weaker than the surrounding bricks/stone. Enter Wall Length (m) Enter Wall Height (m) Lime Mortar Required (kg) Total Nº Of Bags (25kg) COVERAGE CALCULATOR. Lime mortar is a type of mortar mix that was very popular with skilled artisans and masons during the late 1800s and 1900s. This video shows the mix, application and finishing of a reproduction flint wall using the Point Master tool with cement mortar. This page contains a price guide for a new patio. Chessington • Member since 19 Jul 2011 • 4 jobs, 50% positive feedback. Pointing Calculator. Whether you're looking to build a wall for a raised garden or a small retaining wall, a stacked stone wall can offer elegance without a lot of expense. The wall has a brick on edge coping at the junction with the footway in Lewes Road. This shows squared stone with a narrow flush joint. I have a flint wall that needs a bit of patching - its not an old wall but the colour was matched to the older part of the house which was probably a genuine lime mortar, is there any way to colour the mortar to get that off white look like the old lime stuff please? Now this one is an ornate version of the type more commonly found where the flint and mortar mix is visible. 1 tonne will repoint 120 to 160 m2 brickwork or lay approx. This calculator will tell you how much mortar you need in kilograms from the number of bricks, wall area or wall dimensions. Answered 1st Aug 2011 Liked 21. bricky1. 'Flint doesn't create the sort of suck that brick does in a wall by drawing some of the moisture from the mortar and helping it to set. As an example, you may think that with flint being virtually impervious and extremely hard that cement or a hard lime mix would be okay. FLINT WALL BLOG. Stone walls also look better with age. We were asked to repoint the flint walls of a crematorium in Brighton. An absence of grit or aggregate greater than 3-4mm in the joints of the brickwork is normally all that differs from the mortar of the brick & that of the flint. Regards, Rick. To see the … The most common traditional technique, was to throw the cement into the wall from a trowel or hawk. It is medium strength with minimum 5.2 MPa (750 psi) and most common type of mortar. A mortar mix should never be stronger than the product it is bonding and stone tends to be quite soft compared to brick and block which is laid with a 5 and 1 mix normally. With yet others it’s a 50/50 mix. Over the course of a weekend we were introduced to the basics of flint walling, the mortar mix used to hold the flints in place, selecting and laying the right shapes and sizes of flints and how to build up the wall, while taking into account existing layers. 13. For pointing use 4 parts soft sand and 1 part cement. 25 bricks. Please let me know if you have pictures of any other examples. Hope this helps. Using lime mortar can decrease the need for and frequency of expansion joints. The lime mortar was carefully removed to a depth of at least 20mm using comb hammers, then repointed using a 3:1 lime mix (3 parts black sand: 1 part natural hydraulic lime). The mortar is very carefully batched using a number of buckets, each new mix being a precise match to the last to ensure a uniform colour match. Walls can be approximately dated by their coursing, mortar composition and whether flints are used whole, fractured or knapped. Getting the correct mortar mix is very important, as using the wrong aggregate will dramatically change the colour and appearance of your project. And yet the mortar is, and has always been, utterly central to masonry construction. The wrong mortar mix, inappropriate materials, a poor colour choice, or a bad application – will spoil even the best brickwork. The soft and permeable qualities of lime mortar allow for any movement in the structure and ensure moisture in the walls can freely evaporate. Paving Mortar Mix. For high traffic areas, a stronger mix of 3 parts soft sand and 1 part cement can be used. The colour chart is a guide. Mortar is the element that bonds bricks or other masonry units together and provides structural capacity to the wall or other structure. This wall had fallen into disrepair and was becoming dangerous. Type N Mortar. Lime mortar is still popular for use on older Victorian style or brick homes that were made many years ago. Adding mortar makes your wall stable and takes the worry away. that would make the mix very sticky, The mortar is only there to hold the flints apart, not to stick them together. 12. Location: Chichester. What is knapped flint? This wall size coverage calculator will provide you with an estimate of how much premixed hydraulic lime mortar would be required for standard size brickwork (215mm x 102.5mm x 65mm, working to a 10mm joint). They can be stacked without mortar, but this requires stacking them just so. The weather and the time of year can also be factors for the type of mortar used. We had to rebuild a full section of the wall and knit it in to the existing brickwork. 1000 bricks. 2. 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