Isovlas

What Isovlas does

Isovlas is a Dutch manufacturer of biobased building insulation made from European-grown flax fibres, headquartered in Oisterwijk with 51-100 employees. The company produces a portfolio of flexible and rigid insulation boards (PL and PN lines), interior and exterior renovation systems (Reno TG Elegant, Reno Interieur, Reno Exterieur), and prefabricated roof and facade elements (VRD, sound-absorbing variants, patented CLT roof elements, and flat roof elements), with custom-sized (Maatwerk) engineering, 3D drawings, and turnkey delivery offered to large project customers. The technical platform rests on patented processes that combine natural moisture regulation, thermal performance (R-value 3-5 m²K/W, lambda ~0.035 W/mK), sound absorption (65-75%), and EI60 fire resistance, validated against Cradle to Cradle, EPD, ISDE 2026 (with biobased bonus), and Nationale Milieudatabase Category 1 standards.

The company operates a dual go-to-market: an authorised dealer network of 255+ locations serving SMB contractors and private homeowners, and a regional field sales team (West, Zuid, Oost, Midden-Nederland, Zuidoost-Nederland) handling enterprise accounts directly. Revenue is generated primarily through one-time product sales of branded insulation, supplemented by custom engineering and project services for major contractors (Heijmans, BAM, VolkerWessels, Dura Vermeer) and housing corporations (De Woonmensen, Gemeente Koggenland, WonenBreburg). Key reference projects include the 181-home Matendonk (Apeldoorn) retrofit and the 167-home Koggenland renovation, alongside strategic moves into the prefab and modular construction segment via a VKP timber factory partnership. Isovlas is privately held by owner Rogier van Mensvoort since 2015.

Name

Isovlas

Legal name

Isovlas

Website

https://isovlas.nl

Company type

Private

Founded year

1995

Operating status

Operating

Headcount range

51–100 employees

Short description

Isovlas manufactures biobased building insulation from European flax fibres, selling flexible and rigid panels, renovation systems, and prefabricated roof elements through a 255+ dealer network and direct enterprise sales to Dutch contractors, housing corporations, and prefab builders.

Ownership category

akta.pro rank

Product category

Biobased Building Insulation Materials

NAICS

Prefabricated Wood Building Manufacturing (321992), Roofing, Siding, and Insulation Material Merchant Wholesalers (42333)

SIC

Millwood, Veneer, Plywood, & Structural Wood Members (2430), Prefabricated Wood Bldgs & Components (2452)

akta.pro primary industry

Thermal & Acoustic Insulation Textiles (Insulation Felts/Soundproofing) (IMAOADAL)

akta.pro secondary industries

Cellulose (Recycled Fiber) Insulation (IMADAGAC), Roof Insulation & Cover Boards (IMADAFAN)

Keywords

• Biobased building insulation
• Flax fiber insulation
• Natural insulation materials
• Renovation insulation panels
• Prefabricated roof elements

Headquarters

HQ city

Oisterwijk

HQ country

Netherlands

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Flax insulation product sales: Isovlas generates revenue primarily through the sale of biobased insulation products made from flax fibres. Product categories include: PL Bouwisolatie (flexible insulation boards), PN Bouwisolatie (higher density, higher insulation value), Reno TG Elegant (rigid insulated panels for interior renovation), Reno Interieur (flexible interior renovation panels), Reno Exterieur (exterior renovation system), and VRD Dakelement (damp-open roof elements). Products are sold via an authorised dealer network and directly to large contractors and housing corporations.
2. Custom engineering and full-service project solutions: Isovlas provides engineering, 3D drawing, and custom manufacturing services as part of its full-service offering for complex projects. This includes option to supply technical drawings, leg plans, and custom-sized elements for large construction projects. Revenue from engineering services supplements product sales for major project accounts such as Heijmans, BAM, and VolkerWessels.

Pricing tiers

Go-to-market motion3 records

Distribution channels3 records

Marketing channels10 records

Core offering

Isovlas manufactures and sells biobased building insulation products made from flax fibres, including flexible insulation boards (PL, PN), interior and exterior renovation panels (Reno TG Elegant, Reno Interieur, Reno Exterieur), and prefabricated damp-open roof and facade elements (VRD, CLT, flat roof, system prefab). The company offers custom-sized engineering and full-service project support for new construction and renovation, distributed through authorised dealers and direct enterprise sales across the Netherlands.

Product overview

Isovlas is a manufacturer of biobased insulation products made from flax fibers. The portfolio is organized across three main categories: (1) Construction Insulation — Isovlas PL and PN flexible insulation boards for walls, floors, and roofs in timber frame and cavity wall applications; (2) Renovation Systems — the Reno line including Reno TG Elegant (interior post-insulation with finished surface), Reno Interieur (interior post-insulation for unused attics), and Reno Exterieur (exterior post-insulation with multiple variants for different roof types); and (3) Roof and Facade Elements — prefabricated damp-open roof elements (VRD), sound-absorbing roof elements, patented CLT roof elements, flat roof elements, and system-built prefab components. Custom sizing and full turnkey project support (engineering, 3D drawings, layout plans) is available as an added service across all product categories.

Differentiator

Problem solved

Functional benefit

Products and services

• Isovlas PL Bouwisolatie Flexible insulation board made from flax fibres, primarily used in light timber frame construction (HSB) and post-insulation for walls, roofs, and floors. Standard dimensions 60x120cm, available in thicknesses 40–180mm. Supplied as stock product through the dealer network.
• Isovlas PN Bouwisolatie Higher-density flax insulation board offering higher insulation values (lambda value) at relatively thinner profiles compared to PL. Suitable for cavity wall insulation and compact constructions. Produced on request.
• Isovlas Reno TG Elegant Interior post-insulation panel combining flexible flax insulation on a hard, smooth, impact-resistant backing plate with a white factory-finished surface. Designed for high-quality interior renovation of pitched roofs from the inside, featuring tongue-and-groove joint system with concealed fixing. Suitable for habitable attic spaces with fixed stairs.
• Isovlas Reno Interieur Interior post-insulation panel with flexible flax insulation on a hard, flexible, impact-resistant backing plate with white visible side. Applied between T- and L-profiles for unoccupied attics with a loft ladder.
• Isovlas Reno Exterieur Exterior post-insulation system for existing pitched roofs applied from the outside, eliminating the need to replace the entire roof structure. Damp-open, moisture-regulating system available in multiple variants: Reno Exterieur Flex (for complex roofs), Reno Exterieur Light (for detached homes), Reno Exterieur XL Soft (extra-wide panels), and Reno Exterieur XL Plus (for serial housing construction on pre-insulated roofs).
• VRD Dakelement dampopen Damp-open roof element for pitched roofs, combining structural and insulating function in a prefabricated component.
• Geluidsabsorberende dakelementen Sound-absorbing roof elements designed to reduce noise transmission, providing acoustic comfort (sound absorption coefficient 0.65–0.75) in addition to thermal insulation.
• Gepatenteerd CLT Dakelement Patented roof element incorporating Cross-Laminated Timber (CLT) structural layer combined with flax insulation for a solid, sustainable roof solution for timber prefab construction.
• Platdakelementen Prefabricated flat roof elements designed for efficient installation on flat roof constructions, combining structural support with insulation.
• Systeembouw (prefab) Prefabricated system construction elements for serial and modular building, incorporating Isovlas flax insulation in engineered building systems.
• Isovlas Maatwerk Isolatie (Custom Insulation Service) Custom-sized insulation solutions tailored to specific project dimensions for walls, facades, and roofs. Elements are produced to exact measurements and delivered in installation sequence with a clear layout plan, offering turnkey project support including engineering, 3D drawings, and production.

Quantifiable outcome

• ISDE 2026 example: 50m² roof insulation = €1,062.50 total subsidy (€812.50 base + €225 biobased bonus)
• +6 more outcomes

Named customers12 records

Segments5 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature7 records

Partnerships

Eleven partnerships are on record, tiered core and minor.

• Dura VermeercoreStrategic or Co-development Partner · 18 September 2025Isovlas and Dura Vermeer formed a strategic partnership to demonstrate that biobased insulation works at scale in Dutch construction. The collaboration focuses on both newbuild and renovation projects, with Dura Vermeer and Isovlas jointly communicating about circularity, energy efficiency, and healthy indoor environments. Featured in ING Netherlands article on sustainable supply chain transformation. The partnership is mutual and positions both companies as leaders in sustainable construction transformation.
• KnaufcoreStrategic or Co-development PartnerIsovlas collaborated with Knauf to conduct fire resistance testing of flax insulation in complete wall and roof assemblies. This partnership resulted in the EI60 fire classification for Isovlas products — a critical certification for use in Dutch residential and utility construction. The testing was conducted by an independent laboratory and verified by Knauf's technical team.
• VKP (Timmerfabriek VKP)coreStrategic or Co-development PartnerVKP is a timber factory (timmerfabriek) that processes Isovlas flax insulation into prefabricated HSB (houtskeletbouw) elements. VKP represents Isovlas in the prefab/modular construction sector, demonstrating that natural insulation fits within industrial production environments. VKP has stated that the lambda value (~0.035) allows staying within standard wall thicknesses, and that flax insulation does not irritate skin or cause dust, making it pleasant to work with.
• De WoonmensencoreImplementation/ SI/ Consulting PartnerDe Woonmensen is a housing corporation that partnered with Isovlas for the Matendonk renovation project in Apeldoorn. 181 homes from 1975 were retrofitted with Isovlas zolderisolatie (attic insulation), with approximately half of all roofs insulated with Isovlas. The project is referenced as a key example of biobased renovation at scale, demonstrating compliance with sustainability goals and high resident satisfaction.
• Hemink GroepminorImplementation/ SI/ Consulting PartnerHemink Groep is a construction company and partner in the Matendonk (Apeldoorn) renovation project. Hemink confirmed that biobased insulation is now considered a fully fledged technical technique and that Isovlas performs well in practice.
• Takkenkamp Vastgoed VerduurzamersminorImplementation/ SI/ Consulting PartnerTakkenkamp is a real estate renovation specialist and project partner in the Matendonk project. Confirmed Isovlas as a serious, technically sound renovation solution suitable for large-scale implementation.
• Gemeente Koggenland (municipal housing company)coreImplementation/ SI/ Consulting PartnerThe municipal housing company of Koggenland is executing a large-scale renovation of 167 homes across 8 villages, specifying Isovlas Reno TG Elegant as the primary insulation solution. Target is all homes reaching energy label A by 2027. The project is co-led with Van Wijnen Heerhugowaard as main contractor.
• Van Wijnen HeerhugowaardcoreImplementation/ SI/ Consulting PartnerVan Wijnen Heerhugowaard is the main contractor for the Koggenland project (167 homes). Van Wijnen uses Isovlas Reno TG Elegant as the specified insulation material and manages phased renovation across 8 villages, with target completion Q4 2026. Van Wijnen uses its proprietary 'verduurzamingskompas' (sustainability compass) tool to plan energy renovation per dwelling.
• WonenBreburgminorImplementation/ SI/ Consulting PartnerWonenBreburg is a housing corporation for which Isovlas performed attic insulation in Breda in collaboration with Van Son Onderhoud en Renovaties. Project completed with minimal resident disruption and improved energy efficiency.
• ING NederlandminorGTM or Marketing PartnerING Nederland featured Isovlas and Dura Vermeer in an article about sustainable supply chain transformation, highlighting the role of biobased materials in CO₂ reduction and circular construction. This editorial coverage serves as third-party validation and marketing credibility for Isovlas.
• Building BalanceminorStrategic or Co-development PartnerBuilding Balance is a sustainable construction platform that published an article featuring VKP and Isovlas, highlighting the benefits of flax insulation in prefabricated timber construction. The article supports Isovlas's positioning in the prefab/modular construction market.

Scale indicators7 records

Recent moves6 records

Expansion highlights6 records

Broad incumbents

• Kingspan Group: Irish global manufacturer of high-performance insulation (PIR/PUR panels) and building envelope solutions. Competes with Isovlas in the same Dutch construction market, particularly for roof and facade elements where Kingspan's insulated panels are widely specified by tier-1 contractors like Heijmans and BAM.
• Rockwool: Global leader in stone wool insulation for residential, commercial, and industrial applications. Serves the same Dutch housing corporation and contractor customers as Isovlas but at massive scale; represents the incumbent competitive threat that biobased insulation must displace on cost and sustainability grounds.
• Saint-Gobain Isover: Global mineral wool insulation brand and primary competitor across all insulation categories in the Dutch market. Has begun launching biobased product lines, positioning itself as a competitive threat to niche players like Isovlas by combining scale advantages with sustainability credentials.

Direct peers

• Pavatex (Soprema group): Swiss manufacturer of wood-fibre insulation boards (now part of Soprema). Direct peer in fibre-based building insulation with comparable thermal/acoustic performance claims, vapour-permeable construction philosophy, and similar customer base across European timber-frame builders.
• HempFlax: Dutch processor of industrial hemp into insulation mats, building materials, and animal bedding. Direct peer in the natural-fibre insulation category, sharing the same biobased positioning, European agricultural supply chain, and emphasis on moisture regulation and sustainability credentials.
• Steico: German manufacturer of wood-fibre insulation boards, flexible insulation, and structural timber products. Closest direct peer to Isovlas in biobased building insulation, with comparable products (flexible batts, rigid boards, prefabricated elements) and similar target markets across European housing corporations and timber-frame construction.
• Thermafleece: UK-based manufacturer of insulation from British sheep's wool. Closely comparable natural-fibre insulation specialist with overlapping product format (flexible insulation batts), vapour-permeable positioning, and emphasis on healthy/breathable construction for residential renovation.
• Gutex (Homann GmbH): German wood-fibre insulation manufacturer producing flexible batts, rigid boards, and roof/facade elements. Directly comparable to Isovlas in product category (biobased fibre insulation), target customer segments (contractors, prefab builders, housing corporations), and distribution approach (dealer networks across DACH region).

Emerging players

• Unger-Diffutherm: German manufacturer of wood-fibre insulation systems for facades and interior walls. Specializes in wood-fibre external insulation finishing systems (ETICS), offering comparable biobased performance and target segments (renovation, social housing) but with a narrower focus than Isovlas's multi-product portfolio.
• Isolena (Wöll GmbH): Austrian manufacturer of sheep's wool insulation products. Comparable biobased insulation specialist with similar thermal/acoustic performance claims and emphasis on healthy indoor environments, serving German-speaking markets that represent a logical geographic expansion path for Isovlas.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/Isovlas
• YouTubeyoutube.com/user/IsovlasBV
• Facebookfacebook.com/Isovlas
• LinkedInlinkedin.com/company/isovlas

Compliance4 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles5 records

Funding overview

Funding rounds

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 Isovlas