OSBLOCK is a modular wall system made of two layers of rigid foam wrapped around a solid engineered wood core. Each 8-foot block interlocks with mortises and tenons, then tightens with a screwless clip, which keeps courses straight and speeds assembly. The block arrives with exterior strapping and an interior wiring cavity already in place, so framing, insulation, service routing, and furring happen in one step.
The design creates a continuous insulation layer that removes thermal bridges, the weak spots where heat slips through a wall. The company rates the wall at an effective R-32, which is suitable for cold climates and passive-house-style goals. Independent coverage has highlighted the same point, calling it an “inside out” wall with instant high insulation and no thermal bridges.
On site, crews handle fewer operations with fewer tools. Blocks interlock, lock by a quarter-turn clip, and form straight structural walls that can carry upper floors and roof loads. The interior side is ready for drywall, and the exterior takes the usual air barrier and siding. These features cut errors and reduce manpower compared with stick framing or prefabricated panels.
Waste is kept low. When a block is cut, the offcut starts the next course, which reduces dumpster loads and keeps job sites tidy. Factory automation, standardized parts, and packaged accessories support that approach.
For homeowners and builders, OSBLOCK positions itself as a learnable system. The firm offers training, an installer network, online resources, and project examples, and recent public funding signals ongoing expansion of the manufacturing line in Quebec.
A thermal bridge is any spot where the insulation layer is broken, letting heat pass more easily, and R-value is a measure of how well a wall resists heat flow.
OSBLOCK is a proprietary building system. Performance figures and claims come from the manufacturer and secondary press coverage. Local codes, structural engineering, and climate details should be checked for each project.
Treehugger, “OSBlock is an interesting inside-out building system,” 11 March 2019
Explains the system as foam plus OSB core, notes instant R-32 walls and the benefit of no thermal bridges, and frames it as an alternative to conventional framing and ICF approaches.
Government of Canada, “Government of Canada supports growth of OSBLOCK,” 2025
Announces federal support for OSBLOCK to integrate difficult-to-recycle materials into housing products and expand production capacity in Quebec. Indicates public backing and scaling.
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