No Fine Concrete – Uses, Price & Delivery in London
For specialised drainage and lightweight requirements, No Fines Concrete is a porous, permeable mix designed for efficient water management and reduced density. By omitting fine aggregates like sand, it creates a cellular structure that allows water to pass through freely. No Fines is frequently used in sustainable urban drainage systems (SuDS) and projects where hydrostatic pressure needs to be minimised.
No Fines is ideal in the following applications:
- Permeable paving and driveway sub-bases
- Retaining wall backfilling to prevent water build-up
- Insulating floor screeds and lightweight wall panels
No Fines Concrete – Free Delivery in London & Surrounding Areas
No‑fines concrete is a specialist type of concrete mix that contains no fine aggregates—meaning no sand or small particles. Instead, it is made using only coarse aggregates, cement, and water. The result is a lightweight, highly permeable, and thermally efficient concrete with a distinctive open‑textured structure. Unlike traditional concrete, which is dense and compact, no‑fines concrete has interconnected voids that allow water to drain freely and air to circulate.
This unique structure gives no‑fines concrete several advantages in domestic construction, particularly in applications where drainage, insulation, or lightweight construction is required. It is commonly used for drainage layers, permeable slabs, garden structures, retaining walls, and low‑load foundations. In some cases, it is also used for external walls in housing, especially when combined with insulation systems.
No‑fines concrete is not a replacement for structural concrete in load‑bearing applications, but it is an excellent solution for specific domestic projects where permeability, reduced weight, or thermal performance is a priority.
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No Fines Concrete Technical Characteristics
Strength Rating
No‑fines concrete typically achieves a compressive strength of:
- 5–15 N/mm², depending on mix proportions
- Higher strengths are possible with specialist aggregates
This places it below structural concrete grades such as C20 or C25, but its strength is more than adequate for many domestic applications.
Density
No‑fines concrete is significantly lighter than traditional concrete:
- Typical density: 1,600–1,900 kg/m³
- Standard concrete: 2,300–2,400 kg/m³
This reduced weight makes it ideal for lightweight construction and areas where ground conditions are poor.
Permeability
One of the defining features of no‑fines concrete is its high permeability. The interconnected voids allow:
- Rapid drainage
- Reduced hydrostatic pressure
- Natural ventilation
This makes it ideal for drainage layers, permeable pavements, and landscaping.
Thermal Performance
The air pockets within no‑fines concrete provide:
- Improved thermal insulation
- Reduced heat transfer
- Better energy efficiency in wall construction
Workability
No‑fines concrete is:
- Easy to place
- Less prone to segregation
- Quick to compact (often requiring minimal vibration)
However, it cannot be trowelled to a smooth finish due to its coarse texture.
Setting Time
Typical setting times include:
- Initial set: 1.5–3 hours
- Final set: 4–8 hours
- Full cure: 28 days
Because the mix contains no fines, it often sets slightly faster than traditional concrete.
Customer Testimonials
“Our new garden path made from no‑fines concrete has been fantastic. It drains instantly, even in heavy rain, and the natural texture looks great in the garden. It’s been completely maintenance‑free and incredibly durable.”
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Why Choose No Fines Concrete?
No‑fines concrete is the ideal choice when you need:
- A permeable, free‑draining surface
- A lightweight foundation
- A thermally efficient wall material
- A low‑maintenance landscaping solution
- A concrete that reduces hydrostatic pressure
It is not suitable for:
- Structural load‑bearing applications
- Watertight structures
Smooth, decorative finishes
Questions we are often asked about No Fines Concrete
It is often more economical than standard concrete due to reduced cement and aggregate use. Costs vary by region, project scale, and application but tend to be lower for materials. Installation may require specialized knowledge. Get local quotes, as sub-base prep and any coatings add to the total.
No-fines concrete excels in sustainable drainage and lightweight applications but is not a one-size-fits-all replacement for dense concrete. For specific projects, consult a structural engineer or experienced contractor, as performance depends heavily on local climate, soil, and design. Factors like permeability testing or strength requirements should guide decisions.
Bond strength is low, so reinforcement is rarely used or requires special considerations. Additives like air-entraining agents improve freeze-thaw durability. Supplementary cementitious materials can enhance properties in research/modern mixes.
- Permeable uses: Regularly sweep or pressure wash (low pressure) to clear debris, sediment, or vegetation from voids to preserve drainage.
- Walls: Apply external plaster, render, or coatings for weatherproofing and aesthetics.
- Avoid heavy chemicals or de-icers that could damage the structure.
- Inspect for clogging or erosion periodically. Maintenance is generally low but focuses on keeping permeability intact where required.
Like all concrete, it can crack from shrinkage, settlement, or thermal changes, though shrinkage is typically lower. Prevention includes:
- Proper mix design and ratios.
- Adequate sub-base preparation.
- Control joints where needed.
- Air-entraining agents for freeze-thaw areas. Minor cracking is often less critical in drainage applications, but structural uses require engineering oversight.
- Prepare a stable sub-base.
- Mix carefully (coarse aggregate coated with cement paste; avoid excess water to prevent paste drainage).
- Place with minimal compaction (rodding or light tamping — it cannot be vibrated heavily as it may cause segregation of paste).
- It can be dropped from height without segregation.
- Cure properly. Professional installation is recommended for best results, especially for structural or paved uses.
With proper design, installation, and maintenance, it can last 20–40+ years in pavement or drainage applications, similar to or better than some conventional options due to reduced erosion from water. In walls, historical examples have endured decades. Lifespan depends on exposure (freeze-thaw cycles reduce it without protection), traffic loads, and sealing/coating where needed. Regular cleaning of voids helps maintain permeability.
Pros:
- Excellent drainage and permeability — reduces surface runoff, flooding, and ponding.
- Lower material costs (less cement, no sand needed).
- Lightweight — easier handling and reduced foundation loads.
- Lower drying shrinkage.
- Better thermal insulation.
- Environmentally friendlier in some ways (conserves aggregates, aids stormwater management).
Cons:
- Lower compressive, flexural, and bond strength — limits structural use.
- High permeability can allow water ingress (not weathertight without coatings/plaster).
- Poor freeze-thaw resistance without air-entraining admixtures.
- Lower workability and requires careful placement.
- Not ideal for reinforcement due to low bond strength.
- Load-bearing or non-load-bearing cast-in-place walls for single- and multi-story housing (historically popular in Europe/UK since the 1930s).
- Small retaining walls.
- Drainage layers or sub-bases under floors/slabs (damp-proofing).
- Pervious pavements, parking lots, driveways, footpaths, and low-traffic roads (reduces runoff and recharges groundwater).
- Landscaping, stabilization, or as lightweight fill.
- Acoustic/thermal insulation panels in some modern uses.
It is not suitable for heavy structural elements or high-traffic/high-load areas without engineering design.
Common mix ratios:
- Aggregate-to-cement: 6:1 to 10:1 (by volume or mass, often 8:1 or higher).
- Water-to-cement: 0.38–0.60 (lower ratios for stiffer mixes).
Key properties:
- Density: Lower than normal concrete (lightweight).
- Compressive strength: Typically 1.4–14 MPa (200–2000 psi), much lower than standard concrete.
- Permeability: High — water drains freely through the voids.
- Shrinkage: About half that of conventional concrete.
- Thermal insulation: Better due to air voids.
- Workability: Stiffer mix; compaction is usually by rodding rather than vibration.
- Vs. standard concrete: Standard mixes include fine aggregates for density and higher strength. No-fines lacks them, making it lighter, more permeable, with lower shrinkage but reduced strength and higher permeability.
- Vs. pervious concrete: The terms overlap significantly. Pervious (or permeable) concrete is often synonymous with no-fines concrete, both designed for drainage. Some distinctions note pervious concrete may have slight variations in void structure or additives, but they function similarly for stormwater management.
No-fines concrete is a special concrete mix that omits fine aggregates (sand or fines) entirely. It uses only coarse aggregate (typically single-sized 10–20 mm crushed rock or gravel), Portland cement, and water. The cement forms a thin coating around the aggregate particles, leaving large voids (around 20–40% porosity). This results in a lightweight, permeable material unlike standard dense concrete.
