Buy 20mm Ballast Bulk Bag 850kg — Concrete Ballast for Footings, Slabs & Groundworks

💥 20MM CONCRETE BALLAST BULK BAG (≈850KG) — TRADE-GRADE MIX FOR STRONG, RELIABLE BUILDS

If you’re pouring concrete, laying bases, or tackling groundwork, our 20mm Ballast Bulk Bag is the go-to aggregate for strength, consistency, and performance.

This is a washed, graded blend of sand and 20mm stone designed specifically for producing durable concrete mixes on site. Builders, landscapers, and serious DIYers rely on it because it delivers dependable results without the hassle of sourcing separate aggregates.

When you need concrete that sets solid, holds weight, and lasts — this is the ballast to use.

🧱 WHAT IS 20MM BALLAST?

20mm ballast is a pre-mixed aggregate combining sharp sand and 20mm gravel, commonly used across UK construction for producing general-purpose concrete.

It provides the ideal balance of fines and stone to ensure:

Strong structural integrity

Good compaction

Consistent mixing

Reliable load-bearing performance

It’s one of the most widely used materials on building sites for a reason — it works.

🏗️ IDEAL USES FOR 20MM BALLAST

Our ballast is suitable for a wide range of construction and landscaping applications:

Concrete footings and foundations

Fence post installation

Concrete slabs and oversites

Shed and garage bases

Path and patio bases

Groundworks and structural pours

Kerb bedding and small structural jobs

Whether you’re on a commercial site or working at home, it’s a dependable all-round concrete aggregate.

📦 BULK BAG APPROX. 850KG — 20MM BALLAST, READY FOR SITE

Approximate weight: 850kg bulk bag

Aggregate size: 20mm graded ballast

Washed for consistent performance

Easy to mix with cement and water

Bulk bags reduce handling time and keep projects moving efficiently.

⚙️ TYPICAL CONCRETE MIX RATIO

For general-purpose concrete:

1 part cement : 5 parts 20mm ballast + water

Adjust ratio depending on required strength or specification.

🚚 FAST SUPPLY YOU CAN RELY ON

At Wel Timber & Building Supplies, we keep stock moving so your job doesn’t stop.

Next-day delivery across London & the South-East

Local delivery available

Collection from Kings Langley WD4

Trade pricing on multi-bag orders

Consistent stock levels

Reliable supply means fewer delays and smoother builds