Stumbelbloc – The Ultimate DIY Construction System Complete 30-Mould Set (26 Full/4 Half) + Instructional USB.

Stop Buying Blocks. Start Manufacturing Them.

The Stumbelbloc™ Construction System transforms ordinary sand, stone, cement—even suitable construction rubble—into precision interlocking concrete blocks manufactured directly on-site.

Whether you’re building a home, boundary wall, workshop, shed, agricultural structure or business, Stumbelbloc™ dramatically reduces transport costs, construction waste and dependence on expensive skilled labour.

One-Bag Batch

Each complete mould set has been engineered to produce a full batch using:

• 1 × 50 kg bag 42.5 MPa Cement
• 2 × Builders wheelbarrows Fine Sand
• 2 × Builders wheelbarrows 13 mm Stone

One batch fills the complete 30-mould set—no half batches, no guesswork and virtually no wasted cement.

Why Builders Choose Stumbelbloc™

✔ Precision Interlocking Blocks – Self-aligning blocks simplify construction while producing straight, accurate walls.

✔ Build Faster – Precision interlocking blocks combined with the BlockGrip Thin-Bed Mortar System dramatically reduce laying time and mortar consumption.

✔ Reduce Labour Costs – The simple moulding process allows unskilled labour to manufacture blocks with minimal training.

✔ Manufacture On-Site – Turn locally available materials—or even suitable recycled construction rubble—into valuable building blocks where they’re needed.

✔ Proven Structural Performance – Blocks have been tested to 4.8 MPa, exceeding the 4 MPa SABS requirement for standard cement blocks (Using One-Bag Recipe)

Built for South African Conditions

Manufactured from heavy-duty UV-stabilised virgin polypropylene, Stumbelbloc™ moulds are designed to withstand repeated production cycles under harsh African conditions while maintaining accurate block dimensions.

With basic tools and a small working area, builders can establish a compact block production facility capable of manufacturing hundreds of blocks per day.

Build More Than Just Standard Blocks

The Stumbelbloc™ system is far more than a block mould. It is a versatile construction platform capable of producing a range of specialised concrete and lightweight blocks using the mould set and the manufacturing methods included on the Instructional USB.

🏡 Beyond Buildings: Construct retaining walls, swimming pools, fish ponds, livestock feeding troughs, compost bays, raised beds, garden furniture and countless other interlocking structures with minimal cutting and waste.

🌱 Hollow Core Utility Walls:The hollow cores provide convenient space for reinforcing steel, electrical conduit, plumbing, irrigation lines, living walls and even integrated Vermiponic growing systems

🏗 Cast In-situ Lintels: Remove the centre webs where required, install reinforcing steel and cement in place to produce reinforced concrete lintels spanning openings up to approximately 1.6 metres.

🏢 Load-Bearing Columns: Build 400 × 400 mm or 600 × 600 mm reinforced concrete columns that are load-bearing immediately, eliminating expensive formwork and simplifying structural construction.

🔥 Specialty Block Manufacturing: The included Instructional USB also contains production methods for lightweight insulating and refractory blocks, allowing builders to expand into higher-value construction products using the same mould system.

What’s included:

• 26 x Full Block Moulds
• 4 x Half Block Moulds (Essential for corners and ends)
• Instructional USB: Complete production methods, specialty block formulations and construction techniques are included on the Instructional USB, allowing you to maximise the versatility of your Stumbelbloc™ investment.

Video – Build your house in 5 days