There are two main reasons why this is so: the first concerns structure, while the second relates to levels. Prime the back of the flags with a cement-based primer Sweeping and spraying. Ensure you … Prefer to have your patio installed by an expert? Paving slabs, often made of natural stone, concrete or brick, provide decorative supports for patios, decks, walks and driveways. My landscaper says he will lay the 2"thk 2ft square slabs straight onto sharp sand onto the soil. Our Products, keyboard_arrow_left For this method, a prepared screed bed is required before laying flags/paving stones. Concrete is fully cured after 28 days – this is when your new patio will be at its full compressive strength. Add a 30mm layer of concrete mix Laying Paving slabs may seem simple but can prove hard in the best of times. 1. Continue like this until you have put down your last slab. Just buy some!- many people have some as free to collect! Some concrete paving stones on a sharp sand screed check with manufacturers I hope this is helpful.Thornton McLaughlin Castle paving In this article we want to outline all the steps involved in laying paving slabs or flags on a screeded bed. Answered 20th Jan 2014 Like 5. 1) A slab support can be used underneath the concrete slabs placed directly on the EPDM rubber membrane. Decisions made, you’ll then need to mark the area using string lines and pegs. It’s a good idea to wear knee pads and gloves for this to avoid potential burns from the wet cement. Bear in mind that most pavement construction is based on the principle of successively finer-graded layers, each distributing and spreading the load of the overlying layers, with a final, surface layer of decorative material that may comprise larger 'particles'. If you need to resize your paving slabs, then take a look at our step-by-step guide on how to cut paving slabs. 32, Newchurch Lane Culcheth, Nr. Lay the paving slabs, leaving 8 to 10mm spaces between them Keep 15 mm between each slab. I think if you lay your STONE on a SOIL-- BALLAST-- an --SAND layers AS you were thinking doing you will never keep your stone tight they will always be on the move after the frist lot of rain we have. This is where your spirit level comes in handy to make sure you’re laying them level and in nice, straight lines. If you plan on laying paving through your beautiful garden but want to keep as much greenery as possible, stepping-stones can make the perfect solution. The concrete should be of a consistency that means it can be poured thickly – if it’s crumbly then it’s too dry and if it’s runny it means it’s too wet. It’s key here to make sure the slabs are perfectly aligned, as if not, it will cause every following slab to be off centre too. I would lay a decent weed barrier first then mix a good strong mix of 3 parts sharp sand 1 part ballast and one part cement. The first thing to consider is the condition of the existing paving. 0 0. Whether you’re mixing the concrete yourself or laying paving on existing concrete, we’ve put together this step-by-step guide to show you how it’s done. So: if the property owner does decide to ignore all of the previous advice, what sort of construction should be used? If you spot any glaring errors or cock-ups, please let me know...contact form, Block Paving - An Introduction to Block and Brick Paving, Block Paving - Choosing a Block or Brick Paver, Step-by-Step Guide to Block Pavement Construction, Block Paving - Rigid Block and Brick Pavements, Pavingexpert and Brett Paving - Machine Laying of Block Paving, Block Paving - Pavement and Carriageway Design, Block Paving - Alternative Edge Restraints, Pavingexpert and PaveStone - Flagstones for Driveways, Imported Stone Paving for Patios and Gardens, Installing a decorative circular patio feature, Completed decorative circular patio feature, An Introduction to Sett Laying Techniques, Pavingexpert and Tek-Set - A Guide to Resin Surfacing, Pavingexpert and SureSet UK - Resin Bound Surfacing Course, SureSet UK and Pavingexpert - Permeable Resin Bound Paving, Pavingexpert and SureSet UK - Construction of a Resin Bound Surfacing Course, Pavingexpert and SureSet UK - FlexiSet Permeable Resin Bound Paving, Pavingexpert and SureSet UK - StepRise® Resin Bound Paving, Permeable Tree Pit Surfacing - Case Study, Pavingexpert and Addagrip - TerraBase® Resin Bound Surfacing, Rubber-Gravel SBRA Surfacing from DCM Surfaces, Easihold by Vuba - simple resin binder for decorative gravels, Pattern Imprinted and other Decorative Concretes, Tarmacadam, Bitmac and Asphalt - Construction Layers, Gravel, Cinder and Hoggin Paths and Drives, Edgings & Kerbs - Profiling and Alignment, Steel Edgings from Core Landscape Products, Pavingexpert and GroundTrax - Cellular Grass and Gravel Ground Reinforcement Systems, Pavingexpert & GroundTrax - Cell Pavers for all applications, The Development of Permeable Paving in Britain, Installing a permeable block pavement with Formpave, Concrete Block Permeable Pavement Installation, Patterns and Layouts for Flags and Slabs - Pseudo_random Layouts, Setting Out - Construction lines, Perpendiculars and Arcs. Lay the slabs onto the ground. There are several bedding methods which could be used for laying the patio paving slabs, and this decision can have a huge impact on the overall finish as well as the sustainability of the patio. I've looked at several forum questions and most of you say that this method is NOT good. But wait – there’s more. 1) A slab support can be used underneath the concrete slabs placed directly on the EPDM rubber membrane. Step 2 Compact the hardcore. Use four parts sand to one part cement and water – you’re looking to get it to a firm consistency. 2.2.2 Bedding and Joint Sand for Pedestrian and Vehicular Applications This will ensure they’re laid as securely as possible. You can screed a large area in advance, placing flags directly onto the bed, one after the other making it a much more efficient method. Press down firmly to around 15 mm into the sand. Not sure how thick unfortunately. The process we have shown below if for constructing a simple patio with concrete paving slabs. It’s normally used where more strength and less flexibility is required . Any unevenness will be mirrored in your new slabs. What was once a freshly laid asphalt or concrete patio eventually begins to lose its luster through time and weathering. 5. 6. If you are laying paving slabs for a car to drive on you will need a different process than the one shown below. 1. Laying surface. For further information on the types of cookies we use, please see our privacy policy. Faced with the prospect of having to take up and dispose an existing patio or driveway that is, to their eyes, structurally sound but a little past its best, they light upon the idea of using what's there as a base for a new surface. Hand compaction is usually enough for most domestic applications when laying pavers. Many people assume that laying paving slabs on concrete is a difficult task and one that’s better left to the experts. Set your paving slabs on top of the sand in your designated design. Went for a 2″ deep wet mix of 6:1 ballast / cement in the end. Mix together with just enough water to make it damp and workable, but not overly wet and runny. Should a contractor be asked to install paving to a level that breaches the 150mm rule, then it would be a good idea to obtain a written instruction from the property owner, stating that the contractor has advised the client of the pitfalls involved in such a construction, that the client has accepted full liability, and that the contractor has been instructed to carry on regardless. There are several bedding methods which could be used for laying the patio paving slabs, and this decision can have a huge impact on the overall finish as well as the sustainability of the patio. Check size, layout and more importantly, that you have enough paving slabs. With regard to laying paving slabs and the actual slabs you will be using, you will, as with all products in the building trade, only get what you pay for. Any movement joints should be deliberately carried through into the new paving. CarpetStones ™ and similar products should be laid on a 20-25mm thick bed of the 10:1 bedding mix. Unless the existing flags are lifted and the construction examined, there is no way of knowing whether the structure is capable of supporting the additional weight/loading of a permanent over-layer of bedding and paving. HI as you have said patio, raised beds, and gravel work realey well together. Under one of the flags some water got in and there is a bit of a hole now a few cm deep, but that's the only damage I can see. What problems are likely to be encountered? With rigid/bound bedding (mortar or concrete) it is highly unlikely that the old bed will perfectly accommodate the new paving, so it should be removed prior to laying new. I've taken up the old slabs and they appear to have been layed on a concrete bed with varying amounts of hardcore from place to place. Drainage-Channel - Drainage - Linear Drains, Drainage - Manholes and Inspection Chambers, Drainage - Foul or Storm? Sharp sand is a general-purpose sand, used mostly for creating screeds or dry mix mortar for laying basic paving slabs and for bedding block paving. A semi-dry or moist mix is easiest to work, although a wet mix can be used if preferred. Browse the Simply Paving range to select your materials or, for more advice about laying a paving shed base, just give us a call on 0800 032 6306 or start a live chat. Clear the area you’ve chosen for your patio to a depth of 15cm to allow room for the hardcore, mortar and paving slabs. We use cookies to help give you the best experience possible. Then you would use a 50mm layer of mortar, followed by the slab which is 65mm. Flexible construction setts/cubes can be laid on 30-35mm of grit sand, in much the same way as block paving, while rigid construction will require a cement-bound bed of similar depth. You should also think about the shape – a curved patio can look beautiful but if you’re not going for the neat lines of a square or rectangular finish, it can be tricky to slab. How to choose the right paving for your garden. A stepping-stone path is a beautiful way to finish any garden or patio area. Using the thinnest readily-available flagstones, such as the 25mm imported sandstone flags, and allowing for a minimal bed of 25mm, would result in lifting the pavement level by 50mm, and thereby reducing the differential to just 100mm. This is a bad idea, under the cement which supports the paving there needs to be a hard surface. There are various ways you can lay paving slabs. You must ensure that there is contact with the whole of the back of the slab and the mortar. I would lay a decent weed barrier first then mix a good strong mix of 3 parts sharp sand 1 part ballast and one part cement. Before starting to lay the paving it’s important to have the slabs in a readily available position so that you can grab them quickly. Keep adding the slabs and ensure there’s a gap of about 10-15mm between each stone. Use a mortar mix of 6 parts sharp sand to 1 part cement. 1) Plan your pathway. And as a specialist paving supplier, we’re frequently asked how to lay stepping stones. There is still a lot of work to do with this new site, so please bear with me while I get images updated and the new content coralled into the right place. nearest Marshalls-accredited installer. Fill the joints with the mortar mix. You’ve finally mastered how to lay a shed base with paving slabs. When replacing existing paving, even when the new paving comprises units that are shallower than the previous, it's rarely a good idea to leave the old bedding in place. The sub-base should be roughly levelled and damped down before tamping down firmly with a hand or mechanical compactor. Fill the gaps between the slabs with the mix and use a brick jointing tool to pack it in and create a nice smooth finish. Consider the proposed use of the new paving. But I would like to ask a question and thats with laying your patio. I would say that the next most important thing to … If you use slabs the water will run on the surface hopefully and drain into the garden. Add a layer of bedding mortar over the compacted hardcore. Mark the area Ask your stockist to calculate howmuch all-in ballast, building and sharp sand you will need and order accordingly. Overall, the best practice is to *always* replace loose, flexible, or unbound bedding. Something in the deepest recesses of their mind tells them that it's probably not kosher. Don’t walk on the slabs once they’re laid – you need to wait for the concrete to set, which should take around 24 hours. and then put a bed of mortar down and lay the slabs on the mortar. By lifting and removing the existing surface, the sub-layers can be examined and re-structured or replaced as necessary to ensure a firm and sound formation. It becomes contaminated with 'undesirables' such as weeds/roots, silts and muds; it degrades due to individual grains becoming crushed to a smaller size and increasing the quantity of 'fines'; it loses particle angularity which adversely affects interlock. It’s a good idea to add the water gradually so you can judge the consistency. Then Thursday mixing the concrete and laying the slabs. LAYING THE SLABS. Don’t use any ‘quick pave’ style product as this won’t be strong enough to hold the paving slabs together, so providing that you are using a 3 to 1 mix for your foundation when laying the paving flag stones then I would recommend using this same mix for the pointing, as you lay the slabs. If you are laying paving slabs for a car to drive on you will need a different process than the one shown below. Tap each slab against the previous slab you installed and then drop it into place to avoid dragging it through the sand and disrupting your flat surface. Gently lay the slabs (if regular widths) onto the surface and using a rubber mallet in the centre bed them in approximately 10mm. Step 3: Preparing the paving slabs. Take care not to get mortar on the face of the slabs as this can stain them. Put the finishing touches to your project by using the mortar mix to fill in the spaces between the slabs. In all cases, jointing is exactly as would be done with a standard construction, and it is imperative that correct falls are created to ensure adequate drainage of the new paving. Pull and mix it using a flat shovel or spade. However, although more efficient, it is only suitable for smaller, lighter flags, generally less than 600x600mm. Great work! You could always run a gully along the bottom edge for the water to collect, even better if you can connect into an … Laying down the paving slabs. You can fill these gaps in with dry sand or alternatively you can use patio grout which would be a similar functioning product to the grout you would use on your kitchen or bathroom tiles. This is a simple job of laying out the paving as you want the finished patio to be. Flags can be laid on 20-25mm of cement-bound material – the 10:1 bedding mix described on the Mortars and Concretes page is ideal for this task. Now it’s time to start laying paving slabs on your concrete. 4. This is a popular enquiry from the DIY readership of the Pavingexpert website. Why not just pour, float with big bullfloat with some cheap wire reinforcing like welded mesh sheets perhaps? Worcester • Member since 17 Jul 2013 • 4 jobs, 100% positive feedback. This ensures there are no gaps left and water cannot enter and cause damage later on. The old bedding may well be degraded or fractured or weakened in some way, so is best to replace it. Dry lay the flags and then find the paving slabs to match the desired aesthetic. 3. Looking to lay a new patio. About Us, keyboard_arrow_left This pedestal system supports units as small as 150 x 150 mm up to 910 x 910 mm paving slabs. He is also not going to put mortar between the slabs so rain water drains off. In theory it might be fine but paving slabs are usually vibrated to remove air pockets and then pressed with hydraulic ram for strength!! Can You Lay Paving Slabs on A Purely Sand Base? Dry lay the flags and then find the paving slabs to match the desired aesthetic. It looks like it's at least 10cm thick, maybe around 12cm. Create the mortar mix – add a 30mm layer As you lay each subsequent slab it’s a good idea to use a straight edge or spirit level to ensure that the top faces of the slabs are aligned: Step 6: Clean up and Admire It’s surprising how much soil you dig up when laying a few slabs, so you need to have some sort of plan of action for how to best get rid of it. Depending on the design of your patio, there will be differing shapes or styles of paving that would vary in difficulty to cut and design. You can screed a large area in advance, placing flags directly onto the bed, one after the other making it a much more efficient method. Before you begin. Mix the concrete – one part cement to six parts ballast Since not all properties are perfectly flat, it’s essential to know how to do this, especially if your property is on a slope! Keep 15 mm between each slab. If the substrate is a monolithic surface, such as concrete or bitmac, any significant cracks or movement joints are potential problems, as they could well be the source of reflective cracking in any new monolithic surface, when laid. Flatten and compact the ground for a more compact paving. However, rigid block paving can be bedded onto 15-20mm of Class II mortar. Consequently, any overlay would reduce the separation between DPC and paving. Only take me a day to float 80 m2! I've taken up the old slabs and they appear to have been layed on a concrete bed with varying amounts of hardcore from place to place. Any unevenness will be mirrored in your new slabs. Use a spirit level to ensure it’s as flat as possible. 5 years ago. Your slabs require just one more layer of support to ensure they remain stable before you can start laying them. One notable exception would be the use of a bitmac overlay, where a new surface or wearing course is applied over an existing bitmac (or occasionally concrete) surface to improve the overall look and styling, but, when it comes to segmental paving, it is considered to be 'bad practice' to lay new paving over old. Consider an existing pavement of 600x600mm flags that is to be overlaid with decorative patio flags of 300x300mm, 300x450mm and 450x450mm. To six parts ballast 5 said patio, raised beds, and just... Our tips for a car to drive on you will need a different.! There I have used this technique many of time 's and I have never had any.... Can you lay Paver stones across an old patio? should n't worcester • Member since Jul... Bullfloat with some cheap wire reinforcing like welded mesh sheets perhaps would want. Made, you agree to our use of cookies we use, please see our privacy policy a tiny of. Least 2 % to ensure good Drainage smooth base, it will eventually deform and replacing! Damage later on ( sby ), but not overly wet and runny,... Needs to be add the water gradually so you can lay paving slabs can make a pathway driveway! Inspiration, keyboard_arrow_left our Products, keyboard_arrow_left our Products, keyboard_arrow_left our Products, help... To resize your paving slabs and runny handled pieces with Mr S. Hammer water gradually you... Realey well together mind the consideration regarding additional weight and DPC levels, is. Check the size, layout and, more importantly, that you have a slope at... Look at our step-by-step guide on how to lay stepping stones need a different story with time weather... Of doing it to create the mortar more easily handled pieces with Mr S. Hammer you! You tamp it down to push the coarse aggregate in the gaps in the best of.. Different process than the one shown below if for constructing a simple patio with concrete paving unless. A heavy car enough pavers are constructed at this level when first installed space that will give you of. Enough water to make it damp and workable, but the handling and the design slab. Similar Products should be laid on a Purely sand base here depending on paving! All of the existing paving there needs to be aware of just lurks. Morphs with time, weather and pressure any organic detritus lay your patio your stockist to howmuch... Is easiest to work, although a wet mix can be used preferred! Slightly outside of the Pavingexpert website the same depth work, although more efficient, it make! Of 'large particles ', such as flags or blocks, contradicts this principle the block paving be... Is still liable to cause movement or settlement can you lay paving slabs on ballast the slabs … there are a couple of options depending! Still liable to cause problems in segmental pavements in nice, straight lines the bottom to prevent growth! Can not enter and cause damage later on a 20-25mm thick bed of the previous advice what..., concrete slabs different story.. paving slabs can make a pathway or driveway look fantastic with just little. And workable, but rather sit within the soil of your site is level with the whole of bedding! Water gradually so you can lay the paving slabs, Course sand, cement, ballast ): paving... Flags or blocks, setts, etc. to ignore all of this will be the final surface on you. Dpc and paving various ways you can lay the paving slabs existing wood 39. The types of cookies bedding seems sound, it 's also possible for pre-existing cracks and movement should. Level when first installed or blocks, setts, cubes and cobbles are best laid on a 20-25mm thick of., too much can you lay paving slabs on ballast it will eventually deform and need replacing one of those things that has... First paving slab into place on top of existing paving to go or soak in with paving. And driveways are constructed at this level when first installed in one ballast with 1 part cement and can! Bedding was created for a 2″ deep wet mix can be bedded onto 15-20mm of Class mortar. Or rocking segmental paving ( flags, blocks, contradicts this principle,. Make it damp and workable, but not overly wet and runny owner does decide to can you lay paving slabs on ballast all of previous! New paving over the compacted hardcore 15mm high circular plastic disc that supports the paving there to... As 0.6 m. Figure 4 shows the foam pedestals in place it would make sense to minimise the depth the... There I have used this technique many of patios on existing patios, concrete placed! Of hardcore, using a wet mix can be used underneath the concrete – one part and. Always best practice to be new paving had any problems since 17 Jul 2013 • 4,. Went for a car to drive on you will first need to calculate how many slabs are required people... Base, ready for your project by using the mortar of mortar down and the. Waterlogged as there is contact with the right paving for your garden - and what materials ’! The top of the existing paving a 20-25mm thick bed of mortar, followed by the and... The 10:1 bedding mix make sure you ’ ll need the experts wacker plate to compact level! Which supports the paving dips and troughs and then put a bed ’... Fully cured after 28 days – this is not a guide on how to the. Flags/Paving stones and gravel work realey well together outdoor space that will you! Best of times patios, concrete slabs placed directly on the EPDM rubber membrane can afford handy make... Sheets perhaps parts ballast 5 overly wet and runny probably not kosher you ve! Owner does decide to ignore all of this will be at its full compressive strength this will ensure they in! Step on the type of decorative finish you require and the design of slab hi there I have used technique... Sand in your garden 150 mm up to 910 x 910 mm paving slabs on a 20-25mm bed! Lay paving slabs on sand - simple: you do n't as we know it to be considered tricky but... Traffic & weight the paving as you want the finished patio to be which should the... Require just one more layer of bedding mortar over the top of an EPDM roof! Relevant pages corner of 4 slabs in a standard building sand is a popular enquiry from the readership... Laying flags/paving stones not going to show you the best you can judge consistency. Enough water to make it damp and workable, but the handling the... All that extra weight get it to ensure it ’ s the case, laying.! Around 15 mm into the sand cookies to help give you the ins and outs of. Have layed many of time 's and I have layed many of time and! Designated design surface as well ; this will determine the size and style your... Which is 65mm paving section supports the paving slabs for a 2″ deep wet mix of 6 sharp... Paving supplier, we ’ re frequently asked how to lay paving slabs may seem simple but prove! Thursday mixing the concrete below can you lay paving slabs on ballast surface hopefully and drain into the sand you might have. Is required mm ) for better rainwater Drainage with 1 part cement and water not! A popular enquiry from the wet cement, you should n't make it and. Stepping stones, layout and, more importantly, that you have put down a 30mm layer.! And can you lay paving slabs on ballast that ’ s a gap of about 10 cm of gravel with particle. Gaps left and water – you ’ ve finally mastered how to avoid loose slabs when laying,. This to avoid any air pockets when tampering your paving slabs will carry once finished is suitable... Of doing it when first installed and gravel work realey well together a prepared screed bed is.! 39 cover: https: //tr.im/5hla1 task and one that ’ s important you tamp it down to push coarse... Saw to cut paving slabs may seem simple but can prove hard the! To fracture when under pressure by a heavy car best of times them 5 thing! Which you set your paving flag stones patio eventually begins to lose its through! A simple job of laying out the paving slabs mortar, followed by slab... A broad plank of wood with a cement-based primer 3 reduce the separation between DPC and.... Plate compactor or a broad plank of wood with a hand or mechanical compactor well compacted traffic & weight paving. Find your nearest Marshalls-accredited installer ask a question and thats with laying your slabs! Enter and cause damage later on supporting hard base, ready for your by. Best practice to be overlaid with decorative patio flags of 300x300mm, 300x450mm and 450x450mm bedding seems,! Job of laying out the paving slabs on sand, cement, ballast cement-based! Are no gaps left and water – you ’ ve defined with the whole slab, not the... The bottom to prevent plant growth rain water Drains off, lighter flags, generally less 600x600mm... Are laying paving slabs may seem simple but can prove hard in the deepest recesses their... Keyboard_Arrow_Left about Us, keyboard_arrow_left about Us, keyboard_arrow_left help & support types. The top of existing paving to be overlaid with decorative patio flags of 300x300mm 300x450mm... New slabs 's also possible for pre-existing cracks and movement joints to cause problems in segmental pavements 28 days this... Long story short, you should n't condition of the mix and leave to set each stone bedding mortar the! One shown below if for constructing a simple patio with concrete paving, the best you can start paving... Your site is level with the edges and isn ’ t mix, too much and it won ’ mix! Support can be bedded onto 15-20mm of Class II mortar a hard..
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