Everything you want
to know. Upfront.

An interlocking concrete block engineered to stack without mortar. The male-female geometry locks horizontally and vertically. Pre-routed channels carry plumbing, electrical, and data. Each block weighs about 6 lbs so a single person can handle one without lifts.

Traditional CMU needs mortar (skilled masons), rebar grids, and concrete infill — 3 separate skilled trades and ~3 weeks for a single-family shell. Lok-N-Blok snaps together: 2 people, 2 days of training, one week to shell.

Higher compressive strength, 250 mph wind rating (vs ~150 for standard CMU), no mortar joints (which are the weakest point in any concrete wall). Installs 2× faster with unskilled labor.

Lok-N-Blok supports Class A wall-assembly paths where specified. Final fire language depends on the approved assembly, including drywall or finish schedules required by the jurisdiction.

Concrete doesn't host termites, feed mold, or rot. The fundamental problems with wood-frame construction simply don't exist.

Yes. Integral color (not paint) in gray, sand, white, and custom blends. You can also stucco, paint, or side over it — nothing about the finish changes once walls are up.

Not for typical residential. Structural connections come from the interlock geometry plus anchor bolts at foundation and roof tie-downs. Commercial and multi-story projects use supplemental reinforcement per stamped engineering.

The block has R-14 baseline. Add integrated foam inserts for R-28, or exterior continuous insulation for R-40+. Meets every US climate zone.

Any licensed GC or ambitious owner-builder with basic carpentry skills. Our 2-day certification covers foundation prep, first-course alignment, corner geometry, door/window bucks, and roof tie-down. Crews we've certified are now installing ~4 homes/month.

Shell (exterior walls, roof tie-down, dried in): 5–9 days for a 2,000 sq ft single-family. Full close-out with MEP + finishes: 8–12 weeks vs 16–24 for equivalent stick-framed construction.

Yes for ADUs, tiny homes, and single-story builds. We recommend a certified installer for multi-story or any project your AHJ will inspect carefully. The 2-day training is cheap insurance.

Rubber mallet, level, tape, chalk line, impact driver. No framing nailers, concrete mixers, or specialty masonry tools. Everything fits in a pickup.

Factory-routed channels inside each block. Your MEP plan slots in the channels at design time (our AI does this automatically). Rough-in is hours, not days.

Standard framed bucks drop into openings. Our system accommodates any off-the-shelf window/door unit. No special trim carpentry. You can also leave the rough opening when stacking and facially attach the unit using its nailing flange — same as wood-frame construction.

The connection is a post-tensioning system. Steel rods run vertically from the footer or slab through the full wall height to the top plate. Once the wall is dry-stacked, the rods are tensioned — every block is compressed against the rest, every interlock is pulled tight. This is what holds the wall to the foundation and resists uplift.

No specialty corner block needed. The standard block carries integral dovetails on both faces — those same dovetails form the corner geometry. Perpendicular walls interlock through the standard geometry. Full corner detail in the Design Guide at /pro-center.html.

Standard top plate sits on the wall, secured by the post-tensioning system. Standard roof trusses set atop and tie to the top plate — exactly how you already do it on wood-frame and CMU. Conventional methods, conventional tools.

Direct attachment — nail, screw, or glue finish materials to the surface of the block. Higher holding strength than pine lumber. No stud searching: the entire wall is solid attachment surface. Cabinetry no longer needs pre-blocking before sheetrock.

Each block has integral cavities ~1½″ in diameter running both horizontally and vertically through the body. Greenfield or Romex runs through these channels. Brought out anywhere by drilling through the side of the block.

Yes. Designed to cut at 3-inch increments — built-in cut lines mark where to part. For rough openings (windows, doors), you can cut at any point without degrading structural integrity. Standard saw blade cuts cleanly.

Envion® is the proprietary composite material Lok-N-Blok blocks are made from. The base polymer is 100% recycled polypropylene. The compound is heat-resistant, water-resistant, and recyclable end-of-life. If burned (extreme case), it emits only water vapor and CO₂ — no toxic off-gassing or halogens. This is why Lok-N-Blok qualifies as a green building product and is eligible for LEED credit calculation in large architectural and engineering projects.

Yes. Tested by independent lab Wiss Janney Elstner Associates against the International Code Council's acceptance criteria AC447 (mortarless interlocking polymer block walls). Lok-N-Blok meets current National Building Code requirements (IBC / IRC), including all seismic code requirements for zones A through E. Opinion letters available in the Pro Center documents library at /pro-center.html.

Full flame-spread + smoke-development testing performed at UL's laboratories in Northbrook, IL. Detailed results are in the Design Guide & Technical Manual. Email info@blokusa.com with subject "UL Flame Report" for the full report PDF.

Yes. Because Lok-N-Blok meets all requirements of the National Building Code, it carries the same insurability profile as wood-frame and conventional masonry construction. No special endorsement required for typical residential or commercial coverage. Insurers underwrite it the same way they underwrite any code-conforming structure.

~6.2 lbs. That's about 90% lighter than a conventional 8″ CMU (~38 lbs). One person can pick one up and place it. No lifts, no two-person handling, no jobsite back injuries from masonry weight.

Side-by-side construction-time comparisons: ~50% time savings vs. wood framing and ~80% time savings vs. concrete-block walls. Lok-N-Blok stacks and interlocks dry — the wall is ready for interior and exterior cladding the minute you finish the last course. No mortar cure cycle.

Capacity-design analysis under the AC447 protocol shows Lok-N-Blok is at least 10× stronger than conventional concrete block when measured against design capability. Combined with the post-tensioning system, the wall behaves as a single monolithic element rather than a stack of mortar-jointed units (mortar joints are the weakest point in any concrete wall).

Default charcoal gray comes from integral carbon black added to the Envion® compound for UV stabilization — that's what makes the block sun-stable for outdoor exposure. Custom colors are available in any color you want; the only constraint is a truckload-quantity minimum (custom-color runs are made-to-order). Once walls are up you can also stucco, paint, or side over them — nothing about the finish changes after stacking.

Yes. Designed to work in any climate — hurricane (FL/Gulf), wildfire (CA/CO/AZ), seismic (CA/PNW/AK), arctic (cold-soaked), arid (desert UV), tropical (humidity + termites). Concrete-class performance with a polymer base that doesn't rot, rust, or feed insects.

Designed primarily for structural exterior walls, but nothing prohibits interior use. Single SKU + interlocking geometry simplifies the project bill of materials dramatically. Same block goes everywhere.

The same as with any conventional construction — nails, screws, or adhesives. Lok-N-Blok has higher holding strength than pine lumber, so mechanical fasteners hold tightly. Stucco, brick veneer, vinyl/fiber-cement siding, EIFS — all standard interfaces.

Yes — reserve at /preorder.html. No deposit required. You'll lock early-adopter pricing and a Q1–Q2 2027 production slot.

No. Your reservation locks today's pricing. Public pricing will step up ~15% at launch; you pay the locked rate on your final invoice.

$150K–$220K turnkey for the block system, labor, and core finishes. Add site prep, foundation, and interior finish per your local market. Total build typically 30% below stick-framed equivalent.

We partner with construction lenders familiar with alt-material builds. Check our mortgage calculator for rates, or mention financing interest on the preorder form and we'll connect you.

Every dollar, until the pallet physically ships. Cancel by replying to any email from us — we'll refund within 3 business days.

Normal and expected. Update specs anytime before final quote. We re-scope at no cost. The reservation just holds your production slot.

Not yet. We're on a Reg D pathway with a clear roadmap to IPO. Accredited investors can request the private deck at /investor-access.html after executing an NCNDA.

Yes. See /territory.html for scope tiers (ZIP / Metro / State / International). ~20 territories reserved to date; 50 states open.

Yes, and get paid for it. Join our partnership program at /partnerships.html — 2% of block order value on specified projects.

Leadership: John Lewis (CEO/Owner), Bo Perry (COO), Blake Teears (VP Sales/Owner), Clint Zumer (VP Product Dev), Paul Barry (VP Construction), Kevin Flanagan (CIO), plus equity partners Randy McCoige (Cypress Supply, M/yr) and Tim Bleything (Phoenix Restoration, M+/yr). Owned and operated by Legacy Builders Acquisitions Group LLC. Full bios on /about.html.

8 issued, additional pending. The core claim covers the interlocking block geometry plus the internal channeling system. See our legal center.

Primary facility in Florida. Regional satellite facilities opening with state-tier distributor partners. Export pallets ship from Florida to international licensees.

Blocks are reusable — you can disassemble a Lok-N-Blok wall and rebuild with the same material. End-of-life carbon footprint is a fraction of concrete or wood. Details on our solutions page.

If you're accredited per Reg D, yes. Visit /investor-access.html, execute the NCNDA, and you'll receive the private data room + recent cap table.