Porcelain paving has become one of the most popular choices for UK patios, driveways and garden spaces — and it's easy to see why. It's durable, low-maintenance, frost-resistant and looks exceptional when installed well.
But getting it right requires more care than laying traditional natural stone or concrete. Porcelain is extremely dense and non-porous, which means the correct installation method and materials are essential for achieving a strong, durable result. I'm Cleo, owner of The Paving Experts, with over 25 years in the construction industry working with businesses including Tarmac and Instarmac. In that time I've seen porcelain installations fail for the same avoidable reasons, again and again. This guide covers everything you need to know — from excavation and bedding through to priming, grouting, cleaning and the mistakes that cost people money.
If you'd rather talk it through, call us on 0330 122 1025 — we help homeowners and contractors choose the right products every single day.
The three key principles of a successful porcelain paving installation: full bedding support, full primer coverage and correct contact between the primed slab and bedding mortar. Get these three things right and you will have a patio that lasts.
Why Choose Porcelain Paving?
In my experience, customers who invest in porcelain rarely regret it — but those who cut corners on installation often do. Porcelain is manufactured at very high temperatures, producing a dense, hard-wearing surface that is genuinely better suited to the UK climate than many alternatives:
- Resistant to frost, staining, algae and mildew
- Slip-resistant when specified for external use
- Low maintenance — no sealing required in most cases
- Available in a wide range of sizes, colours and finishes
- Suitable for patios, driveways, paths, garden rooms and commercial projects
While porcelain costs more upfront than many alternatives, its durability and low ongoing maintenance make it cost-effective over time. The projects we see failing prematurely are almost never down to the material — they're down to installation shortcuts. Do it once, do it right.
Permeable or Non-Permeable: Which Installation System?
Porcelain paving can be installed using either a permeable or non-permeable bedding and drainage system. Both are supported by current industry guidance — the right choice depends on your sub-base, bedding mortar and jointing product, and they must all be compatible with each other.
Non-permeable system: Water is directed across the surface and away through designed falls. This typically uses a non-permeable bedding system and non-permeable jointing compound. Suitable falls are essential to direct water away from buildings and prevent pooling.
Permeable system: The bedding and sub-base are designed to allow water to drain downward through the construction. The jointing product must be compatible with the permeable system. It's important to note that if the bedding is permeable but the sub-base beneath it is not, you do not have a fully permeable system — water will have nowhere to go.
If you are not sure which system is appropriate for your project, call us before you start — getting this right at the planning stage avoids serious problems later.
Can You Lay Porcelain Paving Yourself?
Porcelain paving can be suitable for a confident DIYer if you are comfortable with physical work and can work accurately. You will need to be able to:
- Prepare and compact the sub-base
- Establish accurate levels and falls
- Handle heavy paving slabs safely
- Use a suitable wet cutter
- Maintain consistent joints and levels throughout
Larger patios, complicated patterns, sloping sites and driveways may be better left to an experienced installer. If you're unsure whether your project is suitable for DIY, give us a call — we'll give you an honest answer.
Tools and Materials You Will Need
Tools
- Wet cutter suitable for porcelain
- Spirit level
- Rubber mallet
- Shovel and mixing equipment
- Wide brush or roller for primer
- Tile spacers
- String line and pegs
- Tape measure and chalk line
- Plate compactor
- Bucket, sponge and Raimondi Pedalo Large Floor Washboy Kit
- Suitable PPE
Materials
- Porcelain paving slabs
- MOT Type 1
- Suitable bedding mortar
- Porcelain slurry primer
- Suitable porcelain jointing compound
Always calculate your quantities before ordering and allow for cuts and breakages. If you'd like help working out what you need, get in touch.
How to Lay Porcelain Slabs: Step by Step
Step 1: Prepare the sub-base
Remove topsoil, turf, roots and any soft material until you reach a firm foundation. Remove all existing vegetation, rocks and debris.
Install MOT Type 1 crushed stone or equivalent in two layers, raking each level before compacting with a plate compactor to a compressed height of 50mm per pass. The sub-base must be fully compacted — this is, in my experience, the most common cause of long-term paving failure. A sub-base that feels firm underfoot when loose is not the same as a properly compacted one. Do not rush this step.
Establish the required fall for drainage before completing the base — a minimum fall of 1:60 (approximately 15mm per 1,000mm) is generally recommended. Ensure water can drain away from buildings and will not collect on the finished patio. We've spoken to many customers who didn't factor this in and ended up with a patio that pools after every shower.
If the paving is adjacent to the house, it must sit at least 150mm below the damp-proof course — this is a building regulation requirement, not a suggestion. Where the patio is not bounded by a solid structure, allow for kerbs or haunching around the perimeter.
Step 2: Plan your layout
Before mixing any mortar, dry-lay the slabs. This allows you to check the layout, plan your cuts and avoid awkward small pieces around the edges — something that always looks poor and is far harder to fix once the mortar is set.
Use string lines or chalk lines to establish your starting point and maintain accurate alignment as you work. Install concrete or plastic edge restraints along the perimeter to prevent the paving from shifting over time. On projects without edge restraints, we frequently see paving creep and joints opening up at the perimeter within the first couple of years.
Step 3: Lay a full bedding bed
Porcelain paving must be installed onto a continuous, full bedding layer — not isolated spots or dabs of mortar. A full bed provides consistent support beneath the slab and prevents unsupported voids that lead to cracking and rocking.
Apply a bedding mortar to a minimum depth of 30mm, screeded level with the correct fall. Prepare the mortar according to the instructions for your chosen system and only prepare as much as you can use while it remains workable. The bedding mortar you choose must be compatible with your chosen primer and jointing system.
Never spot-bed porcelain. Spot-bedding leaves voids beneath the paving and reduces the level of support beneath a rigid porcelain slab. For a reliable installation, every slab must have full contact with the bedding across its entire surface. I cannot overstate this — spot bedding is one of the most common and costly mistakes we see, particularly with larger format slabs.
Step 4: Apply slurry primer — this step is non-negotiable
Slurry primer is one of the most important parts of installing porcelain paving — and the step most often skipped.
Because porcelain is dense and non-porous, it does not readily bond to cementitious bedding mortar without a suitable bonding primer. Unlike natural stone or concrete, it has no microscopic pores to absorb moisture from the bed and create a mechanical bond. Without primer, the connection between slab and bed relies entirely on surface contact — which is often insufficient under thermal movement, heavy use or wet UK winters.
Apply the recommended primer to the entire underside of the slab, including the edges and corners. Where the product requires wet-to-wet application, place the slab onto the bedding while the primer is still wet. Do not allow it to dry first — dry primer is significantly less effective and largely defeats the purpose of using it.
Avoid getting primer onto the visible face of the paving and clean any residue immediately.
Without primer, porcelain paving can and does fail — often within the first year. We've spoken to many distressed homeowners who skipped this step on the advice of their installer and were left with a patio that needed relaying entirely.
We recommend products such as UltraScape Pro-Prime and ProJoint Porcelain Primer for this application. See our dedicated primer section below for more detail.
Step 5: Lay and level the slabs
Carefully lower the primed slab onto the bedding. Use a rubber mallet to gently tap it into position and check the level immediately — across its surface, against neighbouring slabs and along the required fall. Full contact between slab and bed is essential — any voids left beneath the slab are potential failure points.
Maintain consistent joint widths as you lay. Inconsistent joints make grouting harder, look poor and create weak points where movement concentrates. Use appropriate spacers where required.
Use a suction cup lifter to handle large format slabs safely — it allows you to apply primer right to the very edges of the slab. Porcelain slabs are also considerably heavier than they look; attempting to manoeuvre large formats by hand increases the risk of breakage and injury.
Step 6: Cutting porcelain
Use a suitable wet cutter and a continuous diamond blade rated for porcelain when cutting. Do not attempt to cut porcelain with a standard angle grinder or a disc not rated for it — porcelain is hard enough to chip, crack or shatter under the wrong blade.
Measure carefully, mark the slab clearly and take your time around corners and visible edges. Always follow the safety instructions supplied with your cutting equipment and wear suitable PPE. Read our guide on how to cut porcelain without chipping for more detail.
Step 7: Allow the bedding to cure before grouting
Do not rush to grout. Walking on freshly laid porcelain before the bed has cured causes movement that compromises the joint. Check the curing time specified by your bedding mortar manufacturer — typically 24–48 hours for rapid-set products, or up to four days for a traditional sand/cement mix. This is another point where we see well-intentioned projects go wrong — contractors keen to finish the job grouting before the bed has properly set.
Step 8: Joint the paving with the correct product
Once the bedding has reached the required stage for jointing, remove spacers and ensure the joints are clean and free of debris before you begin.
Choose a jointing product suitable for porcelain paving, your joint width and depth, your chosen installation system, and your permeable or non-permeable requirements. The jointing compound must be compatible with the bedding and drainage system you have used. Different products require different application methods — always follow the manufacturer's instructions. See our full grouting guide below.
Keep the surface clean. Clean excess jointing material from the face of the paving as you work. Allowing grout or jointing compound to dry on porcelain can leave unwanted residue or haze that is difficult to remove. We speak to customers every week who are dealing with this — it is entirely preventable.
Why Is Primer Important for Porcelain Paving?
Do porcelain paving slabs need primer?
Yes — for the vast majority of porcelain paving installations on a mortar bed, primer is essential. Porcelain has very low water absorption (typically less than 0.5%), which means it cannot form a reliable mechanical bond with a cementitious bedding mortar on its own. Applying a compatible slurry primer to the back face of each slab before laying bridges this gap and significantly improves adhesion. In over 25 years working in this industry, I have never seen a porcelain installation fail because primer was used. I have seen many fail because it wasn't.
Why do porcelain slabs need primer?
Natural stone and concrete have microscopic pores that allow them to absorb moisture from the bedding mortar below, creating a strong bond as it cures. Porcelain does not have these pores. Without a primer, the bond between slab and bed relies entirely on mechanical contact — which is often insufficient, particularly under thermal movement, heavy use or wet UK winters. The result can be rocking, cracking or slabs that lift entirely. We hear from customers with this exact problem on a regular basis.
What is slurry primer?
Slurry primer is a polymer-modified cementitious liquid or powder-mixed paste applied to the back of porcelain or other impermeable paving before bedding. It wets the surface and provides a chemically active layer that bonds to both the paving and the mortar bed as it cures. It is important that the primer is compatible with the bedding mortar being used — system compatibility matters. Some primers are also suitable for application to the top of the bedding mortar as well as the back of the slab — always follow the specific product instructions.
Where do you apply porcelain paving primer?
Primer is applied to the entire back face (underside) of each slab, including the edges and corners, using a roller or brush immediately before the slab is placed onto the bed. The slab should be placed while the primer is still wet — this wet-on-wet application is critical for most systems. Allowing the primer to dry before placing the slab significantly reduces its effectiveness.
Can you lay porcelain paving without primer?
Technically yes — but we would not recommend it and we are honest about the risk. Some installers get away without primer in the short term, particularly on small domestic patios with limited loading. But the risk of movement, joint failure and slab lifting is significantly higher. Primer is a small additional cost that provides substantial long-term protection. If your installer says primer isn't necessary for porcelain, ask them why and ask them to put that in writing.
Recommended primers for porcelain paving
We stock and recommend the following for porcelain paving installations:
- UltraScape Pro-Prime — a cementitious slurry primer for use as part of the UltraScape BS 7533 mortar system
- Nexus ProJoint Porcelain Primer — a powder primer mixed with clean water and applied by roller to the underside of each slab
For the FUGA-PAVE system, use the dedicated FUGA-PAVE Part B Hybrid Slurry Primer as part of the full FUGA-PAVE installation process.
Always use a primer that is compatible with your bedding mortar and always mix and apply it in accordance with the specific manufacturer's instructions. Mixing ratios, application methods and pot life vary between products — not all primers are the same.
Shop Porcelain Paving Primer →
Choosing the Right Grout for Porcelain Paving
The best grout depends on the paving material, joint size, installation system and desired finish. There is no single answer — and we're always a little cautious of anyone who says there is. Here are the products we recommend and stock for porcelain paving installations.
What is the difference between flowable grout and brush-in grout?
Flowable grouts are mixed with water to a slurry consistency, poured across the paving and worked into the joints with a Neoprene Squeegee. They fill joints completely and are excellent for fine joints from 2mm. They are typically suited to non-permeable installation systems and require careful timing of the clean-down — this is where most people come unstuck. Work too slowly and the grout starts to set on the surface. Work too fast and you're diluting it before it's had a chance to settle.
Brush-in grouts are swept or spread into dry joints, compacted and then either activated with water or left to cure. They are generally more forgiving to apply and are often suitable for permeable installation systems. Ready-mixed brush-in systems such as RapidFlow require no mixing at all, which removes one of the most common sources of error.
What is the difference between cement-based and resin-based paving grout?
Cement-based grouts (such as PorcelPoint and FUGA-PAVE FLEX XP) use Portland cement or hybrid cementitious binders. They are strong, durable and BS 7533-tested where specified, but require careful application and clean-down timing to avoid surface haze.
Resin-based grouts (such as RapidFlow) use polymer binders rather than cement. They tend to be more flexible, more stain-resistant and easier to apply, but are typically more expensive per unit. Some are pre-mixed and require no water at all.
UltraScape PorcelPoint — flowable cementitious grout designed specifically for porcelain
UltraScape PorcelPoint is one of the products we recommend most confidently for porcelain paving. A rapid-setting, super-fine cementitious slurry grout specifically designed for porcelain, it produces a cleaner, finer joint finish than a standard flowable grout. Available in Stone Grey and Limestone.
Suitable for joints from 2mm wide and 20–200mm deep. For use with non-permeable installation systems — requires a solid, non-permeable bed. Initial set approximately 30 minutes at 20°C with a working time of 5–15 minutes — mix one tub at a time and work without delay. Achieves a compressive strength of 49.6N/mm² and is BS 7533 compliant.
The clean-down timing is critical with PorcelPoint. Have your Raimondi Pedalo Large Floor Washboy Kit, clean water and sponge floats ready before you open the first tub.
Nexus ProJoint RapidFlow — premixed resin brush-in grout
Nexus ProJoint RapidFlow is a premixed, resin-based brush-in grout suitable for porcelain and natural stone. It requires no mixing — open the tub and work it into the joints. Permeable and suitable for joints from 3mm upwards. Designed for use with permeable, free-draining installation systems.
RapidFlow is an excellent choice for homeowners who want a professional result without the pressure of a short working window. In our experience, it is considerably more forgiving for first-time users than a flowable cementitious grout.
FUGA-PAVE FLEX XP — hybrid cement grout for porcelain and natural stone
FUGA-PAVE FLEX XP is a hybrid cement-based grout suitable for porcelain and natural stone in both internal and external applications. Joint widths from 3–30mm. Flexible finish, zero-efflorescence positioning.
FLEX XP is part of the wider FUGA-PAVE system — a coordinated bedding mortar (Part A), slurry primer (Part B) and grout, all designed to work together for porcelain and natural stone installations.
Nexus ProJoint TileJam — polymer-modified grout for tiles and paving
ProJoint TileJam is a polymer-modified tile and paving grout suitable for porcelain, ceramic and natural stone. Joint widths from 1–15mm. Suitable for patios, kitchens, bathrooms, wet rooms and swimming pools — a useful choice where the same product needs to serve multiple surface types or where indoor-to-outdoor continuity matters.
Always check the current manufacturer's instructions for application and curing requirements, including compatibility with your installation system.
Which grout should I choose? Quick comparison
| Product | Best suited to | Application method | Joint width | Installation system |
|---|---|---|---|---|
| PorcelPoint | Porcelain paving, narrow joints, non-permeable systems | Flowable cementitious — mix with water, pour & Neoprene Squeegee | 2–50mm | Non-permeable only |
| RapidFlow | Porcelain and natural stone, permeable systems | Premixed brush-in resin — no mixing required | 3mm+ | Permeable only |
| Joint-It Dynamic | Porcelain, natural stone and concrete — suitable in wet conditions | Two-part resin — mixed and applied in wet conditions | 3mm+ | Non-permeable |
| FUGA-PAVE FLEX XP | Porcelain, natural stone and other paving | Hybrid cement — mix with water | 3–30mm | Check product instructions |
| TileJam | Porcelain, ceramic and natural stone tiles/paving | Polymer-modified — mix with water | 1–15mm | Check product instructions |
The correct choice depends on paving material, joint width and depth, your installation system (permeable or non-permeable), indoor or outdoor use, weather conditions and desired finish. Contact us if you'd like a recommendation for your specific project.
Mixing Cementitious Products
Cementitious grouts and primers must be mixed in accordance with their specific manufacturer's instructions. The water quantity, mixing time and method all matter — getting them wrong results in a weaker, less consistent product.
For ProJoint Porcelain Primer, the powder is mixed with clean water. The polymer additives need sufficient time to dissolve and fully activate — undermixing results in poor bond performance. Follow the manufacturer's stated mixing time rather than judging by eye.
For cementitious grouts such as PorcelPoint and FUGA-PAVE FLEX XP, correct water measurement is critical. Too much water weakens the grout and increases haze risk. Too little makes it difficult to work into joints. Mix thoroughly until smooth and lump-free, and do not add water once the grout has begun to set.
Always refer to the product datasheet for the specific water ratio and instructions. If you've lost the datasheet, give us a call and we'll help.
Grouting in Different Weather Conditions
Can you grout porcelain paving in the rain?
It depends on the grout — and the rain. As a general rule, no grouting should take place in heavy or prolonged rain, but some products are more tolerant than others.
Joint-It Dynamic is a two-part resin jointing system that is specifically designed to be applied in wet conditions and actively benefits from moisture during curing. Unlike some other resin systems, it is suitable for use on porcelain paving as well as natural stone and concrete. If you need to grout in changeable UK weather and want a product that works with the conditions rather than against them, Dynamic is worth serious consideration.
RapidFlow can be applied in light rain, but prolonged heavy rain can delay curing and cause the joint surface to wash out before it has set. If rain is imminent, cover the area and wait.
Flowable cementitious grouts such as PorcelPoint are more sensitive to rain — the grout must reach the clean-down stage and be protected from rain during its working and initial set window. Check the forecast carefully before you start, not just before you step outside.
Temperature, direct sunlight and the condition of the paving surface all affect how a grout works and sets. Very hot, sunny days accelerate setting and reduce working time significantly. Cold conditions slow curing. Plan your working day around the weather. Always follow the individual product instructions.
Cleaning During and After Grouting
How do you prevent grout haze on porcelain paving?
Prevention is far easier than the cure. Keep the paving surface damp (not wet) during grouting to slow surface drying, and begin the clean-down as soon as the grout in the joints has reached the correct firmness — check with a light thumb test. Work methodically and do not allow grout to sit on the surface longer than necessary. Have all your cleaning equipment ready before you start grouting.
How do you clean grout from porcelain paving?
- Flowable cementitious grouts — use a sponge float and clean water in circular motions, working across the surface without disturbing freshly filled joints. Rinse the sponge frequently. Remove surface water with a leaf blower or soft brush.
- Brush-in systems — follow the specific product instructions. Some require a dry brush-off before wetting; others a light wash-down after activation.
Use a Raimondi Pedalo Large Floor Washboy Kit and clean water for cementitious grouts. Avoid harsh chemicals during the initial clean-down. Haze that has already dried may require a dedicated grout haze remover — always test on a small area first.
Can you pressure wash porcelain paving after grouting?
Once the grout has fully cured, yes — porcelain paving handles pressure washing very well. However, pressure washing should not be used during or shortly after grouting, as it will wash grout from the joints before it has set. When in doubt, wait an extra day.
How long does porcelain paving grout take to cure?
Curing times vary by product. PorcelPoint reaches an initial set in approximately 30 minutes at 20°C and is open to foot traffic in around 1 hour. RapidFlow typically accepts light foot traffic within 24 hours. Temperature and humidity affect all curing times — always refer to the specific product's datasheet.
Does Porcelain Paving Need Sealing?
Porcelain paving generally does not require sealing because it is non-porous and has very low water absorption — this is one of its key advantages over natural stone. However, sealing requirements can vary depending on the specific paving material and finish, so always follow the manufacturer's recommendations for the product you have purchased.
Common Mistakes When Laying and Grouting Porcelain Paving
After 25 years in this industry, these are the mistakes I see most often — and the ones that lead to the most expensive remedial work:
- Skipping the primer — porcelain is non-porous and requires a suitable bonding system. The single most common cause of failure.
- Using an incompatible primer — the primer must be compatible with the bedding mortar. A mismatch undermines both products.
- Spot-bedding — isolated mortar spots leave unsupported areas beneath the slab. Always use a full bed.
- Allowing primer to dry — if your primer requires wet-to-wet application, it should not be allowed to dry before the slab is placed.
- Not checking levels as you go — check each slab as you work rather than trying to correct the patio afterwards.
- Inconsistent joint widths — inconsistent joints make grouting harder and create weak points where movement concentrates.
- Using a jointing product incompatible with the installation system — a non-permeable grout on a permeable system, or a permeable grout on a non-permeable system, will both cause problems.
- Using a permeable bedding system with a non-permeable sub-base — if the sub-base doesn't drain, you don't have a permeable system regardless of what's above it.
- Incorrect water quantity in cementitious products — too much water weakens the grout and increases haze risk.
- Insufficient mixing — undermixed products have inconsistent strength. Follow the stated mixing time.
- Grouting before the bedding has cured — causes movement that compromises the joint.
- Working in unsuitable weather — rain, frost or intense heat all cause problems.
- Leaving grout on the surface — clean excess material as you work. Dried grout haze on porcelain is difficult to remove.
- Not filling joints completely — partially filled joints allow water ingress, weed growth and accelerated joint failure.
Final Checklist: Before You Finish
Before finishing your porcelain patio, check that:
- The sub-base is properly prepared and compacted
- Suitable falls have been established for drainage
- The layout was planned before laying began
- A full bedding layer has been used throughout
- Every slab has been correctly primed on the full underside
- All slabs have full contact with the bedding
- Joints are consistent throughout
- The correct jointing product has been selected and is compatible with the installation system
- Excess grout has been cleaned from the surface
- The patio is protected for the required curing period
Frequently Asked Questions
I'm Cleo, owner of The Paving Experts, with over 25 years in the construction industry working with businesses including Tarmac and Instarmac. I work alongside a small team of incredibly knowledgeable and caring individuals who share the same passion for getting it right. The FAQ answers below come from the questions we're asked every single day.
Should porcelain paving be laid on a full mortar bed?
Yes, always. Porcelain paving should be laid on a full, even mortar bed, with each slab in full contact with the bedding beneath it. Spot bedding — placing mortar only at the corners or centre of each slab — leaves voids that cause cracking, rocking and premature joint failure. This is one of the questions we're asked most often, usually by someone who has been told spot bedding is fine. It isn't — not for porcelain.
Can porcelain paving be spot bedded?
No. Spot bedding is not recommended for porcelain paving. The combination of porcelain's rigidity and the point loading created by spot bedding almost always leads to cracking, particularly on larger format slabs. A full mortar bed with full slab contact is the correct and only reliable installation method.
Can porcelain paving be laid on a permeable base?
Yes — porcelain paving can be installed over a permeable bedding and sub-base system. Current industry guidance specifically describes porcelain being installed over a permeable mortar bed in certain applications. If using a permeable system, the bedding mortar, sub-base and jointing compound must all be designed and compatible with permeable drainage. The key point is that every layer of the construction — from sub-base upwards — must allow water to pass through. A permeable bedding mortar over a non-permeable sub-base does not constitute a permeable system. Products such as RapidFlow are designed for use with permeable installation systems.
Can porcelain paving be laid on a non-permeable base?
Yes — a non-permeable installation system is a common and well-supported approach for porcelain paving. In this system, water is not intended to drain through the construction — instead it is directed across the surface and away through designed falls. A non-permeable bedding system and non-permeable jointing compound are used, and adequate surface falls are essential to ensure water drains away efficiently. Products such as PorcelPoint are designed for use with non-permeable installation systems.
How wide should porcelain paving joints be?
A minimum joint width of 2–3mm is required to allow grout to fill properly and accommodate minor thermal movement. Very tight butt joints (under 2mm) are not recommended — without a proper joint, there is nowhere for movement to go and cracking becomes likely. Many flowable grout systems work from 2mm; brush-in systems typically require a minimum of 3–5mm. Always check the grout manufacturer's specification for the product you intend to use.
What grout is best for narrow porcelain joints?
For joints from 2mm on a non-permeable system, UltraScape PorcelPoint is specifically designed for porcelain with its super-fine aggregate and flowable consistency. For joints from 3mm on a permeable system, RapidFlow is suitable and considerably easier to apply.
Why is my porcelain paving grout cracking or coming loose?
Grout failure is almost always caused by movement in the substrate or paving, not the grout itself. Common causes: inadequate sub-base compaction, spot bedding, no primer, grouting before the bed has cured, using a jointing product incompatible with the installation system, or water pooling in joints and freezing in winter. Call us and we'll help you diagnose it — we've seen most of these situations many times.
Does porcelain paving need sealing?
Porcelain paving generally does not need sealing because it is non-porous and has very low water absorption — this is one of its key advantages over natural stone. However, always follow the manufacturer's recommendations for the specific product you have purchased, as requirements can vary.
What is the best grout for porcelain paving?
The best grout depends on the joint width and installation system. UltraScape PorcelPoint is a specialist cementitious grout designed for porcelain and joints from 2mm on non-permeable systems. Nexus ProJoint RapidFlow is another excellent option for joints from 3mm on permeable systems. For 1–5mm joints requiring a hard, non-staining, non-permeable joint, Joint-It Porcelain Epoxy Grout is specifically designed for porcelain.
What grout should I use for outdoor porcelain tiles?
Use a specialist external paving grout rather than standard internal tile grout. Suitable options include PorcelPoint, ProJoint RapidFlow and Joint-It Porcelain Epoxy Grout. The correct choice depends on joint width, depth and the installation system. Contact us if you'd like a specific recommendation.
Is epoxy grout suitable for porcelain paving?
Yes. Joint-It Porcelain Epoxy Grout is specifically designed for outdoor porcelain and smooth paving. It is a two-part epoxy grout suitable for 1–5mm joints with a minimum 10mm depth. It creates a durable, non-staining and non-permeable joint. Note that epoxy grout should not be used in rain or when rain is forecast.
What is the best jointing compound for porcelain slabs?
For flowable cementitious grouting, UltraScape PorcelPoint is specifically designed for porcelain and joints from 2mm. For a hard, durable epoxy finish on narrow joints, Joint-It Porcelain Epoxy Grout is suitable for 1–5mm joints. For a brush-in option, RapidFlow is a straightforward premixed resin compound suitable for permeable systems and joints from 3mm.
What is the best grout for 5mm joints in porcelain paving?
Joint-It Porcelain Epoxy Grout is suitable for 1–5mm joints. PorcelPoint and RapidFlow can also be suitable for 5mm joints depending on joint depth and the installation system. Contact us and we'll point you to the right product for your specific setup.
What grout is suitable for external porcelain paving?
Suitable specialist options include PorcelPoint, ProJoint RapidFlow, Joint-It Porcelain Epoxy Grout and FUGA-PAVE FLEX XP. Choose according to joint width, depth, bedding system and whether you need a permeable or non-permeable result.
Can porcelain paving grout crack?
Yes — but cracking grout is usually a symptom rather than the root cause. Movement or debonding between the paving and bedding mortar is the most common underlying issue, often caused by inadequate sub-base preparation, spot bedding or skipping the primer. Address the cause, not just the symptom.
How much porcelain grout do I need?
The quantity depends on the paving area, slab size, joint width and joint depth. As examples: RapidFlow and PorcelPoint both provide product-specific coverage guides. Always calculate your quantities before ordering — contact us and we'll help you work it out for your project.
How much grout do I need for 5mm joints?
The quantity depends on slab size, joint depth and total area. Coverage varies by product — always use the specific product calculator or coverage data for the most accurate quantity. If you're unsure, give us a call with your slab size, joint width, joint depth and total area and we'll work it out with you.
Quick Guide: Porcelain Paving Grout & Primer
- Cementitious porcelain grout: UltraScape PorcelPoint — specialist flowable grout for porcelain and joints from 2mm on non-permeable systems.
- Brush-in resin grout: Nexus ProJoint RapidFlow — premixed, no mixing required, suitable for permeable systems and joints from 3mm.
- Narrow-joint epoxy: Joint-It Porcelain Epoxy Grout — suitable for 1–5mm joints, hard, non-staining and non-permeable.
- Porcelain primer: Nexus ProJoint Porcelain Primer — specialist slurry primer for bonding porcelain to bedding mortar.
- Key installation advice: Porcelain has very low absorption, so achieving a strong bond is essential. Use a suitable primer, follow the grout manufacturer's instructions and ensure joints are completely filled.
Get Help Choosing the Right Products
A successful porcelain paving installation depends on using the right combination of sub-base, bedding, primer and jointing system — and making sure they are all compatible with each other. Take your time with preparation, use full bedding support, prime every slab correctly and choose a grout suitable for your joint width and installation system. Always follow the latest manufacturer's instructions for the specific products you are using.
We're a small, family-run business and I'm proud of the advice we give. We don't just sell products — we help people understand what they actually need for their specific project, and we're honest when one approach is likely to work better than another.
If you're not sure which primer, bedding mortar or grout is right for your job, get in touch or call us on 0330 122 1025. It's usually a quick conversation, and it could save you a very expensive mistake.
See our paving FAQs for more general advice.
