Jointing is one of those patio details that’s easy to overlook when planning a project, but it genuinely affects how well your patio performs and looks over the years. The two main options, resin based jointing compound and traditional kiln dried sand, aren’t simply a case of one being universally better than the other. The right choice really does depend on your slab type and your budget.
At JPD Landscaping & Building Services, we’ve jointed patios across South East London for over 15 years, using both compound and sand depending on the project. This guide walks through exactly when each option makes sense, the practical differences between them, and a real example of how this decision plays out on an actual project.
Key Differences Between Jointing Compound and Sand
There’s no single answer that applies to every project here. Jointing compound and sand each suit different situations, and the right choice depends heavily on your slab type and budget.
Slab Type and Jointing Compound
Jointing Method: Jointing Compound
Best Suited To: Porcelain, large-format slabs, natural stone, high-traffic areas
Slab Type and Sand
Jointing Method: Kiln-dried sand
Best Suited To: Traditional or rustic-style patios, budget-conscious projects
Longevity
Jointing Compound: Longer-lasting, more durable over time
Sand: Prone to washing out and weed growth over time
What Is Jointing, and Why Does It Matter So Much?
Before comparing the two materials directly, it’s worth being clear about what jointing actually does, since it’s easy to think of it as a purely cosmetic finishing touch rather than a functional part of the patio structure. The joint between each slab isn’t just filling a visual gap, it locks slabs together against lateral movement, stops water from working its way freely beneath the paving and into the bedding layer, and prevents debris, seeds, and organic matter from settling directly against the sub base underneath.
A patio with poorly filled, eroded, or missing joints is genuinely more vulnerable to the kind of localised settling and drainage issues covered in our guide on patio drainage problems and fixes, since water finding an easy path down through open joints is one of several routes toward the sub base disturbance that eventually shows up as an isolated puddle or a rocking slab. Choosing the right jointing method, and applying it properly, is every bit as important to a patio’s long term performance as the bedding method used to lay the slabs themselves.
When We Recommend Jointing Compound
We specifically recommend jointing compound in a few common situations, and in our experience, these cover a genuinely wide range of typical patio projects.
- Porcelain and large-format slabs. Compound holds particularly well in the wider, more precise joints that porcelain and large-format paving typically require, providing a clean, consistent finish that matches the material’s overall look. If you’re weighing up porcelain in the first place, our honest breakdown of porcelain paving pros and cons covers the material itself in more detail alongside this jointing decision.
- Natural stone with uneven edges. Natural stone slabs often have irregular edges and varying joint widths from one slab to the next. Compound fills these irregular gaps far more effectively than sand, which can struggle to properly settle and stay in place within inconsistent joint shapes. This irregularity is exactly the same natural variation discussed in our comparison of Indian sandstone vs porcelain paving, where sandstone’s individual character is part of its appeal but does require a jointing approach that can accommodate it properly.
- High-traffic or driveway-adjacent patios. Where a patio sees significant footfall, or sits adjacent to an area with vehicle traffic, compound’s greater durability holds up better under that sustained use than sand would over the same period.
Across all three of these situations, the common thread is that compound performs better where precision, irregular shapes, or heavier use are involved.
How Jointing Compound Actually Works
It’s worth understanding briefly what makes resin based jointing compound perform so differently from sand, rather than treating the difference as simply a brand name versus a traditional material. Jointing compound typically combines fine aggregate with a resin binder, which cures to form a genuinely solid, semi flexible fill within the joint once applied and left to set. This cured material physically bonds to the sides of each slab within the joint, rather than simply sitting loosely in the gap the way sand does.
This bonding is exactly why compound resists both washout during heavy rain and displacement from pressure washing far better than sand, and why weeds struggle to establish through it, since there’s no loose, organic friendly material for a seed to root into in the way there is with a sand filled gap. The trade off is that compound generally costs more per square metre than sand, and application technique matters more, since compound needs to be worked into the joint properly and any excess cleaned from the slab surface before it cures, whereas sand is more forgiving to apply even if it needs periodic topping up afterward.
When We Recommend Kiln-Dried Sand
Sand still has a genuine place in patio jointing, and we specifically recommend it for traditional or rustic-style patios where sand’s natural look actually suits the overall aesthetic the customer is going for. Some garden styles, particularly more traditional or countryside-inspired designs, benefit from the slightly less uniform, more natural appearance that sand jointing provides compared with the smoother, more consistent finish of a resin compound.
This is a genuine aesthetic consideration, not just a budget compromise. For the right garden style, sand’s appearance is actually the preferred look, independent of any cost difference between the two options.
Where Sand Genuinely Suits the Design Brief
It’s worth expanding on this point, since it’s easy to read “we recommend sand for rustic patios” as simply code for “sand is the cheaper option customers settle for.” In practice, some homeowners specifically want the softer, more natural look sand jointing gives, particularly alongside riven or tumbled finish natural stone, cottage garden planting, or a period property where a very crisp, uniform compound joint would actually look somewhat at odds with the rest of the garden’s character.
For these projects, recommending compound purely because it’s more durable would be missing the actual design brief. The honest answer is that sand remains a legitimate, deliberate choice in these situations, provided the homeowner understands and accepts the maintenance trade off that comes with it, covered in detail below.
Durability and Common Problems
Jointing compound offers noticeably better longevity than sand jointing, holding up well over an extended period without the common issues that affect sand over time.
Sand jointing, by contrast, is prone to two common problems that tend to develop together over time:
- Weeds growing through the gaps. Sand-filled joints provide an easier foothold for weed seeds to establish and grow through compared with the more solid, weed-resistant surface of a properly applied compound.
- Sand washing or eroding out. Heavy rain, and particularly pressure washing if not done carefully, can gradually wash sand out of the joints, leaving gaps that then need topping up to maintain the patio’s finished appearance and stability.
These two issues often appear together on the same patio, since a joint that’s lost some of its sand through erosion also becomes more vulnerable to a weed establishing in the resulting gap.
How Pressure Washing Interacts With This Decision
This is a good point to connect back to our dedicated guide on how to clean patio slabs, since jointing choice and cleaning technique are closely linked in practice. Sand jointing is considerably more vulnerable to the exact pressure washing mistake covered in that guide, namely too high a pressure setting directed straight down into the joint lines, since sand has no bonding of its own to resist being displaced by concentrated water pressure.
Compound, once properly cured, is far more resistant to this specific risk, though it isn’t entirely immune to poor technique either, particularly while relatively freshly applied. If you know you’ll be pressure washing your patio regularly as part of routine maintenance, this is worth factoring into your jointing decision alongside slab type and aesthetic preference, since compound’s added resistance to this specific failure mode is a genuine practical advantage for anyone planning frequent, thorough pressure washing sessions.
Full Comparison Table
Durability
Jointing Compound: Strong, long-lasting
Sand: Prone to washing out over time
Weed Resistance
Jointing Compound: Good, solid surface deters weed growth
Sand: Poor, weeds can establish more easily
Best Slab Types
Jointing Compound: Porcelain, large-format, natural stone
Sand: Traditional or rustic-style patios
Aesthetic
Jointing Compound: Clean, consistent, modern finish
Sand: Natural, slightly less uniform, traditional look
Maintenance
Jointing Compound: Low, minimal ongoing attention needed
Sand: Higher, may need periodic topping up
Cost Considerations Between the Two Options
While this guide focuses primarily on performance and suitability, cost is naturally part of most homeowners’ decision making too. Jointing compound generally costs more per square metre than kiln dried sand, both in material cost and, to some degree, in application labour, since working compound into joints and cleaning the surface properly before it cures takes a bit more time and care than brushing sand into gaps.
That said, it’s worth weighing this upfront cost difference against the likely lifetime cost of each option. Sand jointing that needs periodic topping up, and potentially occasional weed treatment, carries its own ongoing cost and effort over the years, even if the initial installation is cheaper. For a patio expected to see years of regular use, the total cost of ownership across compound and sand is often closer than the upfront price difference alone would suggest, particularly once the maintenance time and materials sand requires are properly accounted for.
Making the Right Choice for Your Patio
Given how much this decision depends on your specific situation, it’s worth thinking through both your slab type and your priorities for the finished look before deciding.
- If you’re using porcelain, large-format, or natural stone slabs, or your patio will see heavy use, jointing compound is generally the stronger choice for durability and long-term performance.
- If you’re going for a traditional or rustic garden style where sand’s natural appearance genuinely suits the aesthetic, sand remains a legitimate choice, provided you’re comfortable with the periodic maintenance it may need over time.
Questions Worth Asking Before You Decide
If you’re still weighing this up for your own project, it can help to work through a few honest questions specific to your patio and household. Is your chosen slab type porcelain, large format, or natural stone with genuinely irregular edges, where compound’s practical advantages are strongest? Does your garden lean toward a traditional, rustic character where sand’s softer look would genuinely suit the space better than a crisp compound finish? Will the patio see heavy foot traffic, or sit adjacent to an area with vehicle use, where compound’s added durability earns its higher upfront cost? And realistically, how much ongoing maintenance time are you willing to commit to topping up joints and managing weeds if you do choose sand?
Working through these questions honestly, rather than defaulting to whichever option seems cheapest on paper, generally makes the right choice for your specific patio considerably clearer.
Can You Switch From Sand to Compound Later?
Since the case study above involves exactly this switch, it’s worth addressing directly for anyone with an existing sand jointed patio wondering whether changing to compound later is realistic. The answer is generally yes. The process involves properly clearing out the old, degraded sand from each joint, removing any established weed growth and root material, and ensuring the joints are clean and dry before applying new compound.
This is a genuinely worthwhile option for an existing patio that’s developed the weed and erosion problems sand jointing can be prone to over time, without needing to lift and relay the slabs themselves. It’s essentially a targeted refresh of the jointing layer alone, similar in spirit to how a localised drainage repair addresses a specific symptom without disturbing an entire patio that’s otherwise performing well.
Frequently Asked Questions
Is jointing compound better than sand for patios?
It depends on your slab type and budget. Compound generally offers better durability and weed resistance, making it well suited to porcelain, large-format slabs, and natural stone, while sand remains a good fit for traditional or rustic-style patios.
Why does sand jointing get weeds?
Sand-filled joints provide an easier foothold for weed seeds to establish and grow through, compared with the more solid surface that jointing compound provides once properly applied.
Does sand jointing need to be topped up over time?
Yes, sand can gradually wash or erode out of the joints over time, particularly from heavy rain or pressure washing, which may require periodic topping up to maintain the patio’s appearance and stability.
Can I use sand jointing with porcelain paving?
While possible, compound is generally better suited to porcelain and large-format slabs, since it holds particularly well in the wider, more precise joints these materials typically require.
Why would I choose sand over compound if compound lasts longer?
Sand remains a genuine choice for traditional or rustic-style patios where its natural, slightly less uniform look actually suits the intended garden aesthetic, independent of any durability difference between the two options.
Can I switch an existing sand-jointed patio to compound later?
Yes, this is a genuinely common repair, involving clearing out the old sand and any weed growth, then applying compound to the cleaned joints without needing to relay the slabs themselves.
Does jointing choice affect how I should clean my patio?
Yes, sand is more vulnerable to being washed out by high pressure or a nozzle held too close during pressure washing, while cured compound resists this specific risk considerably better.
Get a Free Quote for Your Patio Jointing Project
Whether you need advice on choosing between jointing compound and sand, or want an existing patio re-jointed, JPD Landscaping & Building Services offers free quotes across South East London.Call now to book your free quote and consultation.
