Affordability of Building With Rammed Earth and ISSB
Rammed Earth and Interlocking Stabilized Soil Blocks (ISSBs) are often promoted as affordable building technologies, but two key factors determine true cost-effectiveness: accessibility of raw materials and the method of soil stabilization.
If suitable soils are available near the site, affordability is largely assured. Using alternative stabilizing agents or techniques that are cheaper and reliable compared to cement also increases savings. Simple designs, such as avoiding curved walls that require customized formwork, further reduce costs.
Initial labor may be slightly higher due to training casual workers in soil preparation, compaction and curing.
For ISSBs, there is the additional sunken cost of a block-making machine. Purchasing a machine to produce blocks on-site ensures consistent quality and greater affordability compared to buying pre-made blocks.
For larger developments, it is advisable to start with sample walls as a form of product testing before full-scale construction.
Most decisions to choose this route are banked on affordability dues to perceived lower cost but we should look at a much bigger picture.
Successful projects using these technologies go beyond cost savings. Considerations include:
- Embracing alternatives to conventional concrete and masonry
- Embracing vernacular or culturally rooted designs
- Reducing embodied energy for environmentally conscious developments
These technologies are ideal for low-cost housing, eco-resorts and culturally oriented social spaces.
They are particularly well-suited to projects built incrementally, financed informally, and developed over longer periods.
In conclusion, affordability is relative. Context matters. Clients/Developers who consider sustainability, cultural relevance, and long-term performance alongside cost are most likely to be satisfied with the final outcome.
Clients/Developers who consider sustainability, cultural relevance, and long-term performance alongside cost are most likely to be satisfied with the final outcome.
For more information, reach out to us via info@rickfes.co.ke
At Rickfes Construction Ltd, we assist developers in implementing rammed earth and ISSB construction for sustainable, culturally responsive and cost-effective projects.
