Rammed Earth Formwork

The ask

Manufacture and rent or sell modular rammed-earth formwork systems — steel or HDPE mould panels and compaction equipment — to low-cost housing contractors, NGOs, and rural self-builders in Bangladesh.

Why now

Rammed earth has moved from academic curiosity to demonstrated practice: BRAC, UN-Habitat, and various NGOs have built certified cyclone-resistant rammed-earth structures in Cox's Bazar and coastal Khulna. The technique is proven; the bottleneck is the tooling. Good formwork is the difference between a smooth 30-minute panel and a three-hour struggle. Construction material costs have spiked 40–60 % since 2020, making earth-based alternatives newly competitive versus fired brick.

Why Bangladesh

Bangladesh needs roughly 300,000 new affordable housing units per year; the majority are built by informal contractors and self-builders who cannot afford pre-cast concrete. The country has alluvial clay soils across most of its landmass — suitable for rammed earth after simple stabilisation with 5–8 % cement or lime. Char and coastal areas, where brick delivery is expensive and flood risk is high, are the prime early market. Timber and bamboo formwork is already widely used, so builders understand the concept.

As a business

The primary model is formwork rental (daily or weekly hire) through tool-hire depots and NGO procurement offices — similar to scaffolding hire. A secondary model is outright sale of panel sets to larger contractors. Revenue per mould set (8–12 panels) is ৳2,000–4,000 per week on rent or ৳80,000–120,000 outright. An NGO contract for 500 housing units generates a six-month rental revenue stream from a modest depot inventory. Training services (certified rammed-earth builder courses, ৳5,000–8,000/person) add margin and create a skilled labour network that drives more formwork demand.

Economics

Move the sliders to model your own formwork hire business. Defaults are order-of-magnitude estimates — pressure-testing them is part of what a founder pitches us.

What ZEPH would back

A founder with a construction or civil-engineering background who has already built at least one rammed-earth structure and has a relationship with an NGO housing programme or a Char Development and Settlement Project (CDSP) contractor. We want the first depot to be self-funding within 18 months before we back a rollout.

Impact

A formwork hire depot that keeps 20 sets at 60% utilisation enables ≈50 rammed-earth housing units/year by contractor clients, displacing approximately 750,000 fired bricks and avoiding roughly 225 tCO₂e/yr. Training revenue multiplies this further by creating a skilled workforce that sustains demand for the equipment. Because rammed earth uses local soil rather than imported clinker, each housing unit keeps approximately US$40 in-country; a 20-set depot indirectly saves ≈US$2,000/year in FX at default utilisation — a figure that scales linearly with fleet size.