Isolco

What Isolco does

Isolco B.V. is a Dutch family-owned supplier of sustainable building envelope solutions, founded in 1983 in Maarheeze, Netherlands, and operating in the Benelux (Netherlands, Belgium, Luxembourg). The company supplies steel roofing and facade systems under the Sterprofiel brand (including felsdak/seamed roof variants), steel gutter systems under the Stergoot brand (carrying DUBOkeur certification and a Greencoat bio-based coating made from Swedish rapeseed oil), and foam insulation products under the Sterfoam brand. Until May 2024, Isolco also distributed wood wool cement acoustic panels (Troldtekt/Stertekt) with a stated 70-year lifespan and Cradle-to-Cradle Gold certification, but on May 22, 2024, those activities — including the entire Stertekt range and team — were transferred to long-term partner Troldtekt B.V. as part of a formal divestiture, narrowing Isolco's focus to steel roofs, seamed roofs, and gutter systems.

The company runs a sales-led, relationship-driven go-to-market model in which product specialists act as expert advisors providing custom project support, including acoustic measurements, reverberation calculations, and specification support for NTA 8800 and NEN 1068 projects, rather than transacting through e-commerce or distributor channels. Customers are primarily architects, contractors (aannemers), finishers (afbouwers), and traders/merchants in the Benelux. Revenue is generated through one-time project-based sales of building materials plus an embedded professional advisory layer, with all pricing quote-based and no publicly disclosed price list; certifications emphasized include DUBOkeur (NIBE), Cradle-to-Cradle Gold, FSC, and PEF. The firm is a true family business — founded by Wim Bax, taken over in 2010 by sons Ronald Bax (production) and Jurgen Bax (sales) — and operates with a small team of 11–50 employees from its headquarters at Den Engelsman 5, 6026 RB Maarheeze.

Name

Isolco

Legal name

Isolco BV

Website

https://isolco.nl

Company type

Private

Founded year

1983

Operating status

Operating

Headcount range

11–50 employees

Short description

Isolco B.V. is a Dutch family-owned supplier of sustainable steel roofing, seamed roof (felsdak), and steel gutter systems, serving architects, contractors, and finishers across the Benelux. Following a May 2024 restructuring, the company divested its wood wool cement panel business to focus on steel building envelope solutions.

Ownership category

akta.pro rank

Product category

Building Materials

NAICS

Sheet Metal Work Manufacturing (332322), Roofing, Siding, and Insulation Material Merchant Wholesalers (42333)

SIC

Metal Doors, Sash, Frames, Moldings & Trim (3442)

akta.pro primary industry

Metal Cladding, Soffits & Trim (Non-Panel Components) (IMADACAM)

Keywords

• Steel roofing systems
• Steel gutter systems
• Building insulation materials
• Construction cladding solutions
• Sustainable construction materials

Headquarters

HQ city

Maarheeze

HQ country

Netherlands

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Building Materials Sales: Isolco generates revenue through the sale of construction materials including steel roof/facade systems (Sterprofiel, felsdak), steel gutter systems (Stergoot), wood wool cement panels (Troldtekt/Stertekt), and combipanels. Products are sold directly to architects, contractors, and finishers via product specialists who provide custom project advice.
2. Expertise & Advisory Services: Isolco provides custom project advice as a key value differentiator. Products include acoustic measurement services, reverberation calculations, and specification support for NTA 8800 and NEN 1068 projects.

Pricing tiers

Go-to-market motion1 record

Distribution channels2 records

Marketing channels3 records

Core offering

Isolco supplies sustainable construction materials for the Benelux building market, including Sterprofiel steel roof and facade profile systems (felsdak, topline, coverline), Stergoot steel gutter systems with DUBOkeur (NIBE) certification and Greencoat bio-based coating, and Sterfoam foam insulation products. Since May 22, 2024, the company has focused exclusively on steel roofing, seamed roofs, and gutter systems after transferring its wood wool cement activities to Troldtekt Benelux B.V. Products are sold directly to architects, contractors, and finishers through product specialists who provide custom project advisory services.

Product overview

Isolco provides sustainable building solutions including steel roof/facade systems (Sterprofiel), steel gutter systems (Stergoot), and foam insulation products (Sterfoam). The company previously offered wood wool cement acoustic panels under the Troldtekt/Stertekt brands, but transferred these activities to Troldtekt B.V. on May 22, 2024. Isolco focuses on long-lasting, maintenance-free steel roofing, seamed roofs (felsdak), and gutter systems with DUBO certification.

Differentiator

Problem solved

Functional benefit

Brands

• Stergoot: Steel gutter system with DUBO-keur certification, environmentally friendly with bio-based Greencoat coating.
• Sterprofiel
• Sterfoam

Products and services

• Sterprofiel Steel roof and facade profile system including felsdak (seamed roof), topline, and coverline variants, providing durable, low-maintenance steel roof and wall cladding solutions for construction projects in the Benelux region.
• Stergoot
• Sterfoam
• Combipanels Self-produced combination panels combining thermal insulation and acoustic properties, manufactured in the Netherlands at Isolco's Maarheeze facility since 2006.

Quantifiable outcome

• Wood wool cement panels have a lifespan of up to 70 years
• +2 more outcomes

Named customers5 records

Segments4 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Two partnerships are on record, tiered core.

• Troldtekt B.V.coreStrategic or Co-development Partner · 22 May 2024Troldtekt is Isolco's long-term partner and main supplier of wood wool cement acoustic panels. On May 22, 2024, Troldtekt B.V. formally took over all wood wool activities from Isolco B.V., including the entire Stertekt product range. The entire Isolco/Stertekt team transferred to the new company Troldtekt Benelux B.V. Isolco continues as a focused company on steel roofs, seamed roofs, and gutter systems. For wood wool solutions, customers are referred to Troldtekt B.V.
• Stertekt BVcoreOthersSister company of Isolco, also led by the Bax family. Stertekt produces and sells wood wool cement panels. As of May 22, 2024, the wood wool activities of both Isolco and Stertekt were transferred to Troldtekt Benelux B.V.

Scale indicators3 records

Recent moves6 records

Expansion highlights4 records

Broad incumbents

• Rockwool International: Danish manufacturer of mineral wool insulation and acoustic ceiling solutions. Directly comparable to the Troldtekt/Stertekt wood wool cement panel range Isolco historically distributed, and competes in the same Benelux specification-driven acoustic ceiling market.
• Kingspan Group: Irish-headquartered global leader in insulated panels, roofing, and building envelope systems. Overlaps with Isolco in steel-faced insulated roofing and facade panels as well as foam-based insulation (akin to Sterfoam), but at vastly larger scale and across multiple continents.
• Wienerberger: Austrian-headquartered manufacturer of clay bricks, roof tiles, and building envelope solutions. Comparable as a long-established European building materials specialist serving architects and contractors with durable facade and roofing systems.
• BMI Group: European roofing and waterproofing systems provider owned by Standard Industries. Competes in pitched-roof steel systems and complementary roofing accessories, addressing similar architects and contractors across Benelux and broader Europe.
• Recticel: Belgian manufacturer of rigid PIR/PUR foam insulation panels and acoustic products. Comparable to Isolco's Sterfoam insulation line and to its former Combipanel offering combining thermal and acoustic performance, serving overlapping Benelux construction customers.
• Tata Steel Construction Products: European steel building envelope business (Colorcoat, steel cladding systems, roofing profiles). Overlaps with Isolco's coated steel roofing and facade product lines and serves similar architect/contractor channels in Western Europe.
• ArcelorMittal Construction: Steelmaker's construction products division producing profiled steel cladding, roofing sheets, and structural building components. Competes with Isolco's Sterprofiel steel facade and roof panel offering at larger industrial scale across Europe.

Direct peers

• Lindab: Swedish/Danish manufacturer and supplier of steel roof, wall, and rainwater systems. Lindab directly supplies the Sterprofiel and felsdak product range carried by Isolco, making it both a supplier partner and the closest like-for-like peer in metal building envelope products for the Benelux market.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• Xx.com/isolcobv

Compliance4 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles3 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 Isolco