Reusable Concrete Wall Mould for Low-Cost Island Construction
A PVC-based wall form designed to be produced locally instead of importing ICF blocks — a cost-driven brief where the honest answer was to change the approach.
A client in the Caribbean wanted young professionals to be able to afford a house. His ICF blocks were stuck in China — shipping cost and vessel availability had made an imported building system unworkable.
The problem
The design constraint was economic before it was technical:
- Whatever replaced the imported block had to be producible locally, or the same shipping problem returns.
- Cost could not be passed on. Every design decision that added price defeated the purpose of the project.
- Concrete has to be poured either way, so the system’s value is entirely in how easily the form can be produced, handled and reused.
- Candidate materials were PVC and PP, with CNC processing as the likely production route.
The approach
- Interlocking form geometry so sections align and stack without separate connectors — every extra component is a cost the client could not carry.
- Sections shaped for the process, keeping profiles simple enough to be produced and machined locally rather than needing complex tooling.
- Reuse designed in. A form that survives many pours changes the unit economics far more than shaving material from a single-use part.
- The uncomfortable advice given early. When one proposed route was the most expensive option on the table, the client was told plainly — before it was designed, not after.
The result
Two design iterations of a reusable wall form system, with the trade-off between in-house production ease and unit cost made explicit at each step.
Where this applies
Construction products and tooling where the real specification is a price per unit. The design that wins is the one whose production route the client can actually access.
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