Why Many Local Cement Blocks Are Weak and Porous

You’ll often hear people talking about “cheap blocks”!

Walk through a construction site in The Gambia, and you’ll often hear people talking about “cheap blocks” or see walls that crumble easily under pressure. This is a common problem — many locally made cement blocks are weak and porous. But why does this happen, and what does it mean for your home or building project?

The Problem with Local Cement Blocks

1. Poor Mix Ratios

Many block makers use too much sand and not enough cement in their mix. While this reduces costs, it results in blocks that lack strength and durability. A weak cement-to-sand ratio means the block can’t hold together under stress and absorbs water more easily.

2. Inadequate Curing

Cement blocks need to be kept moist for at least 7 days to harden properly. Unfortunately, in many cases, blocks are sold or used within a day or two of being made. Without proper curing, the blocks remain brittle, fragile, and porous.

3. Over-reliance on Manual Production

In small-scale block yards, blocks are often made with hand-mixed batches and low-pressure moulding. This results in uneven compaction, air gaps, and inconsistent quality — some blocks may look fine, but break apart easily when used.

The Consequences

  • Weaker Structures: Buildings made with poor-quality blocks are more vulnerable to cracks and even collapse.
  • Water Absorption: Porous blocks soak up rainwater like a sponge, leading to damp walls and black mould.
  • Frequent Repairs: Homeowners spend extra money on plastering, repainting, and maintenance.
  • Lower Property Value: A building that shows early signs of wear puts off buyers and reduces resale value.

The Better Alternative: Eco Interlocking Earth Blocks

Eco Interlocking Earth Blocks (CIEBs) are engineered to solve these exact problems:

  • Proper Compression: Each block is made with a hydraulic press, ensuring uniform density and strength.
  • Reduced Porosity: Unlike weak cement blocks, CIEBs don’t absorb as much water, keeping walls dry and mould-free.
  • No Weak Mortar Joints: The interlocking system reduces reliance on mortar, cutting down the weak spots where water usually seeps in.
  • Consistent Quality: Every block follows the same standards, so you can trust the integrity of your walls.

Practical Tip for Builders

If you must use cement blocks, always ask about the mix ratio and curing process. A quick test is to knock two blocks together — if they sound hollow or crumble easily, they’re likely poor quality. For a more reliable solution, consider CIEBs, which are designed for durability in The Gambia’s climate.

Conclusion

Weak and porous cement blocks may seem cheaper upfront, but in the long run, they lead to higher costs, more maintenance, and weaker buildings. Eco Interlocking Earth Blocks provide a stronger, longer-lasting, and more sustainable alternative for Gambian builders and homeowners.

Ready to build smarter?

 Contact US today to learn how our interlocking blocks can make your project stronger and more affordable.