Blok® is a patented snap-together composite building block made from Envion® — engineered to meet IBC/IRC building codes. Like the building blocks you played with as a child, but built for real homes and light commercial construction. No mortar. No nails. No glue.
Blok® is a patented snap-together composite building block made from Envion®, a proprietary material resistant to water, mold, insects, UV, fire, and chemicals.
It interlocks with a self-aligning dovetail — so walls go up faster, straighter, and lighter than conventional masonry, with documented installation roughly 2× faster than stick-framing.
Every Blok is identical and interlocking. Walls, corners, and openings assemble from one repeatable unit — no specialty masons, no cure time.
Engineered to meet IBC/IRC building codes for detached dwellings, townhouses, multi-family, and low-rise commercial buildings up to 5 stories.
One engineered unit replaces a stack of trades, materials, and failure points.
Engineered composite geometry carries serious structural load with a wide safety margin.
89.0 kips prism · ASTM C140At ~6.2 lbs a block, one worker handles what used to take two — 90% lighter than conventional CMU.
~6.2 lb · 90% lighter than CMUNon-combustible composite assembly supporting a Class A path — independently fire tested.
2-hour burn rate · UL 723Envion® does not absorb water or feed mold — passing standardized water-penetration testing.
Passes ASTM E331The composite withstands harsh sun, salt air, and microbial exposure without degrading.
Envion® compositeCut, trim, and fit on site with a standard table saw — no proprietary or specialty tools.
Standard table sawThe cellular wall geometry dampens noise — effective acoustic performance for interior walls.
Acoustic dampeningEnvion® is a sustainable composite of 100% recycled polypropylene — and recyclable again at end of life.
100% recycled polypropyleneAn interlocking dovetail design self-aligns every course — walls go up plumb and true.
Self-aligning dovetailFrom a single-family home to a five-story mixed-use building — one block system, validated across residential and light-commercial construction.
Everything below is for engineers, building officials, and developers — the test standards, design limits, full specifications, and material science behind the Blok.
The Blok system is evaluated under nationally recognized test methods and the alternative-materials pathway in the building code.
Simple projects move fast on a simplified path; ambitious projects scale up to five stories under licensed-engineer review.
Prescriptive tables let builders move directly to construction for one- and two-story projects without per-project structural calculations.
Taller buildings are engineered by a licensed structural engineer using the full design methodology.
Generous clear heights support modern residential and light-commercial floor plans.
Vertical tension rods at a maximum spacing of four blocks tie walls together for uplift and lateral resistance.
Performance figures, test references, and material data — the numbers an engineer or building official needs.
Figures reflect current testing and engineering review. Project-specific values are confirmed by the engineer of record. Material data sheets available on request.
The features that make Blok faster to install, stronger to load, and easier to live with — all moulded into a single ~6.2 lb composite unit.
Square studs on the top face seat into the receivers of the course above — every block sets itself.
Male and female dovetails interlock horizontally; walls rise plumb without constant gauging.
Hollow channels carry electrical and plumbing run-outs, dampen sound, and drop unit weight to ~6.2 lb.
Trim, notch, and shape on site with a standard table saw — no proprietary tools.
Vertical cores stack to take continuous tension rods (max every four blocks) — the wall ties itself together for uplift and lateral loads.
Envion® is the material science behind the Blok — a proprietary composite engineered from 100% recycled polypropylene. It's what lets a block weigh ~6.2 lbs and still carry a structural load.
Because it's a sealed composite — not wood, not concrete, not steel — it simply doesn't give the usual building failures anything to work with.
No mortar to mix, no cure time to wait on, no specialty crews to schedule.
Place the first row of Blok on the prepared footing or slab. The dovetail registers each block to the next.
Each block snaps into the one below — self-aligning, so walls rise plumb and true without constant checking.
Vertical tension rods drop through aligned cores at up to four-block spacing and tie the wall together.
Channels carry plumbing and wiring; finishes apply as specified. Walls build roughly 2× faster than stick-frame.
Every project starts with the same ~6.2 lb unit. The system scales by adding more — not by changing what it is.
~6.2 lb · one-person handling · field modifiable.
Single-family dwelling or accessory unit — simplified design path.
Attached residential at neighborhood scale — code-compliant prescriptive path.
Multifamily or low-rise commercial — advanced design by a licensed engineer.
Measured against the two systems it most often replaces.
| Attribute | Lok-N-Blok | Concrete CMU | Wood Framing |
|---|---|---|---|
| Unit weight | ~6.2 lb | ~30–38 lb | Varies |
| Mortar / cure time | None — snap together | Required | N/A |
| Wind rating | Up to 250 mph | Design-dependent | Design-dependent |
| Fire performance | 2-hr · UL 723 | Non-combustible | Combustible |
| Water / mold / termite | Resistant | Mostly resistant | Vulnerable |
| Build speed | ~2× faster than stick-frame | Slowest | Baseline |
| Field modification | Table saw | Saw / wet cut | Table saw |
| End of life | Disassemble & reuse | Demolition | Demolition |
Comparison is directional; conventional-system performance varies widely by design, region, and code path.
Early adopters on the ground are spec'ing Blok on a growing roster of projects.
The first time I watched a crew stack a wall in an afternoon, I stopped budgeting in days and started budgeting in hours.
Lighter than CMU, locked together better than CMU, and the lifecycle is on a different page. We're spec'ing it on three projects.
Blok is engineered in the United States, designed to meet U.S. building codes, and built around an American manufacturing supply chain. The block you stack today is the same block your great-grandchildren can disassemble, refit, and reuse a century from now.
Lok-N-Blok is our contribution to America's next 250 years of construction: lighter on the planet, harder on hurricanes, easier on the people building the country.
Reserve a builder kit, request the full technical package, or talk through a project with our sales team. No deposit to get started.