The HempRock is a proprietary hempcrete siding system developed by Joel Earle Bennett — a fire-resistant, mold-eliminating, generationally durable exterior and interior wall application that can be applied directly onto existing structures. In a state where wildfire insurance cancellations have displaced over 100,000 homeowners, where black mold destroys homes from the inside, and where people are running out of wood to build with, The HempRock is not just a product — it is an answer.
The HempRock emerged from a critical realization: while traditional hempcrete is a phenomenal building material, it is cast-in-place and largely restricted to new, custom builds. Meanwhile, millions of existing structures remain vulnerable to modern climate pressures.
The HempRock is different. It is a spray-on, retrofittable hempcrete siding application. It can be applied to interior or exterior surfaces, transforming existing buildings without tearing down walls.
California and much of the West are in crisis. With massive wildfire risks, homeowners are facing catastrophic insurance cancellations. Legacy materials are failing: wood siding burns, vinyl melts and releases toxic smoke, and traditional stucco traps moisture, fueling black mold.
The only rational response is to make the structure itself resistant to fire. The HempRock provides an immediate, scalable answer to this crisis.
The core formulation is a precise blending of the woody center of the hemp plant (hurd), specific cementitious binders, and natural color powders (oxides).
The true innovation lies in the proprietary measurements, the exact sequence of mixing, and the specialized pneumatic spray-application technique that allows the material to adhere directly to existing structural surfaces seamlessly.
Because traditional stucco and siding trap moisture, many retrofit projects begin with black mold remediation. The HempRock system includes a powerful pre-treatment protocol utilizing a CO₂ dry ice blasting system.
This unit fires nitrogen ice pellets at surfaces, which instantly evaporate on contact. It eradicates black mold deeply and immediately, without introducing harsh chemicals, excess moisture, or leaving any residue behind.
Hempcrete is inherently non-combustible. Finishing an existing wall with HempRock dramatically reduces ignition risk from ember cast and radiant heat.
The material is highly breathable and naturally antimicrobial, actively regulating moisture within the wall cavity and preventing the conditions that allow mold to thrive.
Unlike wood siding that rots and warps, or vinyl that becomes brittle and melts, a HempRock envelope is designed to be passed forward across generations.
The superior insulation properties of the hemp hurd matrix stabilize internal temperatures, reducing the baseline energy required for monthly heating and cooling.
Hemp is one of the fastest-regenerating crops on earth. The HempRock mix actively sequesters carbon, turning the home's envelope into a climate-positive asset.
Through the integration of natural oxide pigments, the application can be custom-colored and textured, resulting in an elegant, organic, stone-like appearance.
Properties situated in High Fire-Hazard Severity Zones (HFSZ) that are facing uninsurable status or require critical asset hardening to maintain coverage.
Ranches, ecovillages, and retreat centers prioritizing values-aligned, bio-based materials that integrate with surrounding ecosystems.
High-square-footage hospitality spaces where structural durability, acoustic dampening, and story-driven architectural aesthetics add distinct value.
Contractors and developers facing increasingly strict, sustainability-mandated building codes who require proven, fire-resistive alternatives.
The HempRock is not developed in isolation. It is actively integrated into the Regen Campus Model—a living laboratory where regenerative practices across 11 domains (including agriculture, architecture, energy, and water) are woven into a single producing ecosystem.
Our pilot application takes place at the home of Johnny "Appleking" Pomeroy, a regenerative land pioneer. His property serves as the Northern California flagship of the Regen Campus model.
Prove the product via full-scale interior and exterior applications on an existing structural footprint.
Codify the process, application timeline, and core crew workflow required to price and execute all future jobs accurately.
Produce a definitive photographic and video documentation portfolio, transitioning the product out of theory and into a tangible, proven reality.
Review the comprehensive vision, market positioning, and scalable impact of The HempRock.
Founder & Artisan Finisher
Joel is the inventor of The HempRock system and the holder of its proprietary mix formulation. He brings hands-on construction and materials knowledge, the developed process methodology, and a deep commitment to making durable, fire-resistant housing accessible to the communities that need it most.
Founding Partner & Land Steward
Owner of the pilot property and one of Northern California's most respected regenerative land practitioners. Founder of 3 Suns Farm, bringing deep community credibility and the physical prototype site.
Business Dev & Creative Tech
Bringing 20+ years of media and creative technology experience combined with regenerative stewardship. The strategic architect of the narrative, documentation lead, and connector to the broader Regen Campus.