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. The soft and permeable qualities of lime mortar allow for any movement in the structure and ensure moisture in the walls can freely evaporate. There is no trowel work at all, the pointing being achieved by gloved hands and a stiff brush when ready. Lime mortar is a type of mortar mix that was very popular with skilled artisans and masons during the late 1800s and 1900s. What is knapped flint? Pointing Calculator. that would make the mix very sticky, The mortar is only there to hold the flints apart, not to stick them together. '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. There are two main methods of constructing a flint wall: 1. FLINT WALL BLOG. 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 a section of brick and flint wall at the front of North Lodge of approximately 1600mm height. ProjectsListed Flint Stone Wall in Chichester. Regards, Rick. 11 Where an irregular facing stone such as flint is used, small pieces of stone, tile or brick are pushed into the wet mortar to reduce the volume of mortar and shrinkage problems. 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. Lime is also a natural fungicide, so the wall will remain looking better for longer. Judging by the second image, the original mortar appears to be a lime based mix. The most common traditional technique, was to throw the cement into the wall from a trowel or hawk. Now this one is an ornate version of the type more commonly found where the flint and mortar mix is visible. 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. 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. Hope this helps. A 3.5:1 mix of coarse sharp sand and lime putty is often used, sometimes with a pozzolan added. This is not normally used now. Please let me know if you have pictures of any other examples. (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) The wall has a brick on edge coping at the junction with the footway in Lewes Road. A stone wall can give your garden timeless appeal. Mortar Calculator . For bedding under the slabs use 5 parts sharp sand, 1 part soft sand and 1 cement. 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. Flint Walls Flint is an impervious material that is very hard, but it does not need to be set in a very strong mortar. In fact, many people still consider lime mortar to be superior to many types of modern mortar mixes. The lime adds some flexibility. 2. This calculator will tell you how much mortar you need in kilograms from the number of bricks, wall area or wall dimensions. The lime mortar should always be softer than the stone and generally I use a 4:1 mix. It is medium strength with minimum 5.2 MPa (750 psi) and most common type of mortar. With yet others it’s a 50/50 mix. For pointing use 4 parts soft sand and 1 part cement. Dry powder lime mortar: Heritage Mortar / NHL & Natural Mortar /NHL 25kg bag will repoint 3 to 4 m2 brickwork or lay approx. The wrong mortar mix, inappropriate materials, a poor colour choice, or a bad application – will spoil even the best brickwork. 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. Walls can be approximately dated by their coursing, mortar composition and whether flints are used whole, fractured or knapped. We were asked to repoint the flint walls of a crematorium in Brighton. Enter Wall Length (m) Enter Wall Height (m) Lime Mortar Required (kg) Total Nº Of Bags (25kg) COVERAGE CALCULATOR. The amount of pozzolan added will vary according to the hardness of the masonry and the degree of exposure of a site. 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. 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. The weather and the time of year can also be factors for the type of mortar used. It is a low strength mortar with minimum 2.5 MPa (350 psi). 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. We had to rebuild a full section of the wall and knit it in to the existing brickwork. 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). Mortar is the element that bonds bricks or other masonry units together and provides structural capacity to the wall or other structure. Repointing flint work in Brighton. They can be stacked without mortar, but this requires stacking them just so. Paving Mortar Mix. 13. Home Work Services Flint Types Team Blog Contact. It clearly indicates how easy the Point Master makes this previously highly difficult job. This is known as galleting. 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. Strong cement mortar is wrong to use, as the water that enters the wall through tiny cracks will not be able to dry out. This page contains a price guide for a new patio. Colour Chart. Home Work Services Flint Types Team Blog Contact. The wall is distorted out of shape a certain amount and has been the subject of previous repairs. 1000 bricks. 25 bricks. It allows moisture to evaporate and walls to breathe. So you can't … 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). Flint work specialists. This shows squared stone with a narrow flush joint. There also appears to be a few globs of modern portland cement in a couple of spots. Lime mortar is still popular for use on older Victorian style or brick homes that were made many years ago. Type O Mortar. This is huge shame as, when done well, repointing brickwork is a job that can really enhance a home, despite its seeming insignificance. Getting the correct mortar mix is very important, as using the wrong aggregate will dramatically change the colour and appearance of your project. The mixing is different (mix ratios, no admixtures etc.) 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. The Myth in the Mix The 1:3 ratio of lime to sand Gerard Lynch. Stone walls also look better with age. And yet the mortar is, and has always been, utterly central to masonry construction. 14. and Repair of Flint Walls”, Technical Pamphlet 16, with kind permission of the Society for the Protection of Ancient Buildings. This wall had fallen into disrepair and was becoming dangerous. 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. Answered 1st Aug 2011 Liked 21. bricky1. This mortar joint has been given a convex v-shaped profile referred to as a beak or double truck joint. We use traditional methods & materials such as lime mortar to cater for specific conservation requirements. The colour chart is a guide. Type N Mortar. thanks Mike Adding mortar makes your wall stable and takes the worry away. Render Mortar Mix (Modern Buildings) 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? In recent building-site history, mixing mortar has become a job for the general labourer, despite often being unqualified and poorly skilled. Those are the dark grey patches at the lower right hand side and along the base of the wall. With yet others it’s a 50/50 mix. Our skilled craftsmen used a lime mortar mix with new flint and stone work to match in with the conservation area. 12. 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. 15. The consistency of the mortar is vital – not too wet or too dry, but quite ‘sticky’ as a lot of the work is done by gloved hand. 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). 11406. 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. Chessington • Member since 19 Jul 2011 • 4 jobs, 50% positive feedback. Location: Chichester. Suppliers of Lime Mortar, Lime Plaster & Building Conservation Materials 01642 430 099. Estimate mortar quantity for building and bedding with bricks or blocks. Type N mortar used for reinforced interior and above-grade exterior load-bearing walls on which normal loads are imposed. To see the … This video shows the mix, application and finishing of a reproduction flint wall using the Point Master tool with cement 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. For high traffic areas, a stronger mix of 3 parts soft sand and 1 part cement can be used. 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). Using lime mortar can decrease the need for and frequency of expansion joints. 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. 1 tonne will repoint 120 to 160 m2 brickwork or lay approx. Hope this helps. , despite often being unqualified and poorly skilled using the wrong mortar mix, inappropriate materials, poor. 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