What Plastiblok does

Plastiblok, operating under the brand Lok-N-Blok, is a Paducah, Kentucky-based materials company that has developed and begun commercializing a patented interlocking building block system made from its proprietary Envion® composite, a 100% recycled polypropylene formulation. The blocks self-align using integral dovetails and posts/receivers, require no mortar or specialized tools (only a rubber mallet), integrate a vertical post-tensioning system running from footer to top plate, and contain internal cavities for electrical routing. The product has been independently tested by Wiss Janney Elstner Associates under ICC AC447 criteria (meeting IBC/IRC including seismic zones A–E) and by UL laboratories for flame spread and smoke development, and qualifies for LEED calculations due to its recycled/recyclable composition. The company has a registered patent on the interlocking block design and a registered trademark on the Envion® material name.

The company sells directly to consumers (homeowners) and to professional builders/contractors, combining a self-serve website channel with a sales-led motion targeting larger projects; pricing is not publicly disclosed but a cost-comparison tool is offered, and custom color orders require truckload minimums. Customer segments targeted include residential construction (homes, apartments, disaster relief housing, storm shelters), commercial construction (offices, retail, hotels, parking garages), and institutional/government work (schools, medical, military, emergency response). The model home in Paducah began construction in Q1 2023, and the company reports pre-sold materials across multiple southeastern US markets and international commitments in nine countries across the Caribbean, Central, and South America.

The firm operates with a very small team (1–10 employees), is privately held, and discloses only a single early funding round of $250,000 (2014) with no subsequent institutional rounds. Revenue mechanics rely on one-time product sales of physical blocks plus technical/design support via a Pro Center, with no recurring or licensing revenue model identified. The leadership includes Gregory Siener as President, and the company is effectively founder-led after a roughly 26-year product development effort that culminated in a December 2021 product launch.

Name

Plastiblok

Legal name

Lok-N-Blok

Website

https://lok-n-blok.com

Company type

Private

Founded year

1995

Operating status

Operating

Headcount range

1–10 employees

Short description

Plastiblok (DBA Lok-N-Blok) manufactures and sells a patented interlocking building block system made from 100% recycled polypropylene (Envion®), targeting residential, commercial, and institutional construction markets through direct-to-consumer and professional builder sales channels.

Ownership category

akta.pro rank

Product category

Building Materials / Structural Building Components

NAICS

Concrete Block and Brick Manufacturing (327331)

SIC

Concrete, Gypsum & Plaster Products (3270)

akta.pro primary industry

Concrete Masonry Units (CMU) & Segmental Concrete Products (IMADAAAC)

Keywords

• Interlocking building blocks
• Recycled polypropylene blocks
• Mortar-less construction materials
• Green building components
• Structural building blocks

Headquarters

HQ city

Paducah

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Technology or R&D, Operations, Marketing or Sales, Personnel, Infrastructure

Revenue model

1. Building Materials Sales: Lok-N-Blok generates revenue through the sale of their interlocking building block products. The blocks are sold as general-purpose structural blocks (charcoal gray standard) or custom colors (requiring truckload quantity minimum).
2. Technical Documentation and Design Services: Company provides Design Guide and technical documents through their Pro Center, supporting product sales and professional customer engagement.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels5 records

Core offering

Plastiblok manufactures and sells Lok-N-Blok, a patented interlocking building block system made from its proprietary Envion® composite material (100% recycled polypropylene). The blocks self-align via integral dovetails for mortar-less assembly with only a rubber mallet and are positioned as a structural alternative to wood framing and concrete masonry units for residential, commercial, institutional, and disaster-relief construction.

Product overview

Lok-N-Blok is a single unified product system consisting of an innovative interlocking building block made from the company's proprietary Envion composite material (100% recycled polypropylene). The product is designed for both residential and commercial construction applications. Lok-N-Blok blocks interlock using integral dovetails and can be assembled with just a rubber mallet without nails, glue, or mortar. The system offers significant advantages over wood framing (50% time savings) and concrete block walls (80% time savings).

Differentiator

Problem solved

Functional benefit

Brands

• Envion®: Proprietary composite material made from 100% recycled polypropylene used in Lok-N-Blok building blocks. Qualifies as a green building product for LEED certification calculation.

Products and services

• Lok-N-Blok Interlocking Building Block System A patented, self-aligning, mortar-less interlocking building block that uses integral dovetails and posts/receivers to connect with only a rubber mallet or hammer. Made from Envion® composite, it serves as the structural wall system for residential, commercial, institutional, and disaster-relief construction and can be cut at any point for rough openings without degrading structural integrity.
• Envion® Composite Material A proprietary composite material made from 100% recycled polypropylene that yields high structural strength, insulation, water/insect/mold/UV/fire resistance, and qualifies the finished blocks as a green building product for LEED certification. Available in a standard charcoal gray (with carbon black additive for UV resistance) and in custom colors subject to a truckload minimum purchase.

Quantifiable outcome

• Over 50% construction time savings vs wood framing
• +4 more outcomes

Named customers6 records

Segments3 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

Two partnerships are on record, tiered core.

• Wiss Janney Elstner AssociatescoreStrategic or Co-development PartnerIndependent testing laboratory performed tests on Lok-N-Blok under the International Code Council's acceptance criteria AC447. Concluded that Lok-N-Blok meets current National Building Code (IBC/IRC) requirements, including all seismic code requirements for zones A through E. Opinion letters available in Pro Center documentation.
• UL (Underwriters Laboratories)coreStrategic or Co-development PartnerIndependent testing laboratory conducted full range of smoke development and flame spread tests at UL's laboratories in Northbrook, IL. Results detailed in Design Guide and Technical Manual. UL Flame Report available upon email request.

Scale indicators6 records

Recent moves6 records

Expansion highlights6 records

Direct peers

• Renco: Renco manufactures a composite structural building block system made from recycled materials (fiberglass and calcium carbonates) for residential and commercial construction — directly comparable in concept to Lok-N-Blok's recycled-polypropylene interlocking blocks.
• Fox Blocks: Fox Blocks (a brand of Airlite Plastics) produces insulated concrete forms (ICFs) — an alternative structural wall system competing for the same builder/developer channel and code-compliant wall-assembly use cases that Lok-N-Blok targets.
• Nudura: Nudura is a leading ICF wall system manufacturer serving residential and commercial builders with code-approved, faster-construction wall assemblies — directly overlapping Lok-N-Blok's positioning versus wood framing and CMU.
• Quad-Lock Building Systems: Quad-Lock manufactures ICF wall systems marketed on speed of construction, energy efficiency, and code compliance — the same value propositions Lok-N-Blok emphasizes with its interlocking Envion® blocks.
• Bautex Systems: Bautex produces composite wall blocks (molded foam and cementitious composite) marketed as a lighter, faster, code-compliant alternative to CMU — competing head-to-head with Lok-N-Blok for the structural-block replacement opportunity.
• Rastra: Rastra makes structural wall panels from recycled EPS (polystyrene) cement composite — the closest direct analog to Lok-N-Blok's recycled-polypropylene approach, with similar sustainability, code-compliance, and disaster-resilience messaging.
• Logix ICF: Logix ICF (formerly Logix Brands) is a major ICF wall system maker serving residential and light-commercial builders — competing in the same time-savings, code-compliant wall-assembly category that Lok-N-Blok is targeting.

Emerging players

• Plastbau (Plastedil): Plastbau/Plastedil produces stay-in-place plastic formwork panels for walls and slabs, an alternative-method wall system based on polymer materials — adjacent to Lok-N-Blok in material and value proposition, though focused on forming concrete rather than serving as the finished block.
• Plant Prefab: Plant Prefab is a prefabricated housing manufacturer using sustainable materials and factory-built panels — adjacent peer in the alternative-construction, sustainability-driven builder/developer market that Lok-N-Blok also targets.
• Cover (now Hearth): Cover/Hearth designs and installs prefabricated accessory dwelling units and homes, competing for the same residential builder/developer demand for faster, lower-cost, code-compliant construction methods that Lok-N-Blok's blocks are designed to enable.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• Xtwitter.com/LokNBlok
• YouTubeyoutube.com/channel/UCjzL6Hb6PYKRLpO4IxB7QUg
• LinkedInlinkedin.com/company/lok-n-blok

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds1 record

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Plastiblok