Calduran Kalkzandsteen

What Calduran Kalkzandsteen does

Calduran Kalkzandsteen B.V. is a Dutch manufacturer of sand-lime (calcium silicate) structural wall products serving residential and commercial construction in the Netherlands, Belgium and Germany. The product portfolio spans small-format masonry units (lijmblokken, vellingblokken, metselblokken, kimblokken, metselstenen), large-format Caldubo and Hoogbouw elements (100x65cm, up to 44 N/mm² compressive strength enabling 8–12 floor buildings), and a full mortar line (Calduran Lijmmortel summer/winter variants, Metselfix, Kimfix, Reparatiemortel), with the Doorwerksysteem enabling year-round construction. Production runs from two facilities in Harderwijk and Hoogersmilde, with ~200 employees, roots tracing to 1905 (Roelfsema's Albino factory), and current legal entity formed in 2004 via merger of Roelfsema, Anker and Harderwijk under CRH Plc ownership.\n\nThe company operates a sales-led, indirect distribution model: dedicated account managers issue project-specific quotations based on architectural and structural drawings, and small-format products are invoiced exclusively through building materials wholesalers in NL/BE/DE, while large element projects are quoted directly to the customer's preferred dealer. Revenue combines hardware sales (stones, blocks, elements, mortars, lifting equipment, anchors) with embedded professional services (Uitgekiend wall pre-drawing, Lateiservice lintel design, PlanXchange, BIM/Revit libraries, on-site Service & Support, and Techniek & Advies). The Caliber Casco sub-brand bundles the full system into a turnkey structural shell offer. Differentiated technical documentation, certifications (KOMO IKB1081, CE, NL BSB, ISO 9001/14001, EN 771-2, BRL 1004, EPDs) and embedded specification support create switching costs once a project is drawn around the system.

Name

Calduran Kalkzandsteen

Legal name

Calduran Kalkzandsteen B.V.

Website

https://calduran.nl

Company type

Private

Founded year

2004

Operating status

Operating

Headcount range

101–250 employees

Short description

Calduran Kalkzandsteen B.V. is a Dutch manufacturer of sand-lime (calcium silicate) brick and element wall systems, producing from two plants in Harderwijk and Hoogersmilde for residential and commercial builders in the Netherlands, Belgium and Germany via building materials wholesalers.

Ownership category

akta.pro rank

Headquarters

HQ city

Harderwijk

HQ country

Netherlands

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Building Materials Sales: Primary revenue stream from manufacturing and selling sand-lime stone products including stones, blocks, adhesive blocks, velling blocks, masonry blocks, sill blocks, and masonry stones. Products are sold via the building materials wholesale trade with standard commercial terms.
2. Mortar and Auxiliary Materials: Sale of complementary products including adhesive mortar, repair mortar, masonry fix, and sill fix products. Sold alongside main products via the same distribution channel.
3. Technical Advisory Services: Technical consulting, drawing of wall layouts, and construction site guidance provided as part of the wall system service package.
4. Custom Engineering Services: Custom services including Uitgekiend (wall pre-drawing with material packages), Lateiservice (lintel calculation and drawing), and PlanXchange for project-specific solutions.

Pricing tiers

Go-to-market motion1 record

Distribution channels2 records

Marketing channels5 records

Core offering

Calduran Kalkzandsteen manufactures calcium silicate (sand-lime) brick and element products — including lijmblokken (glue blocks), vellingblokken (velling blocks), metselblokken (masonry blocks), kimblokken (sill blocks), metselstenen (masonry stones), large-format Caldubo and Hoogbouw elements, and specialized Calduran adhesive mortars — for load-bearing and non-load-bearing walls in residential and commercial construction. Products are sold exclusively through the building materials wholesale trade in the Netherlands, Belgium, and Germany, and are accompanied by technical advisory, wall pre-drawing (Uitgekiend), lintel design (Lateiservice), and on-site construction guidance services.

Product overview

Calduran Kalkzandsteen is a market leader in the Netherlands producing and supplying calcium silicate brick wall systems to the construction industry. The product portfolio is organized around a unified wall system architecture consisting of: (1) Core products - calcium silicate bricks in various formats (lijmblokken, vellingblokken, metselblokken, kimblokken, metselstenen), large-format elements (Caldubo Elementen, Hoogbouwelementen) for rapid construction achieving 80-120 m² per day, and specialized mortars (Calduran Lijmmortel, Metselfix, Kimfix, Reparatiemortel) for bonding; (2) Supporting products including auxiliary materials (hulpmateriaal) and lifting equipment (hijsmaterieel); (3) Value-added services including Calduran Uitgekiend (pre-drawn wall design), PlanXchange (planning), Doorwerksysteem (cold weather construction), Lateiservice (lintel design), Service & Support (on-site guidance), Techniek & Advies (technical advisory), and Bestekservice (specifications); (4) BIM services providing Revit libraries for digital design. The Caliber Casco sub-brand offers complete structural shell solutions combining all components. Products are supplied via building materials distributors with FSC-certified pallets and are certified to EN 771-2, BRL 1004, with CE and KOMO marks.

Differentiator

Problem solved

Functional benefit

Products and services

• Calcium Silicate Brick Products (Stenen & Blokken)

Quantifiable outcome

• Construction speed of 80-120 m² per day with two-person gluing crew using large elements
• +4 more outcomes

Named customers3 records

Segments4 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

One partnership is on record.

• CRH PlccoreStrategic or Co-development PartnerCRH is the parent company of Calduran Kalkzandsteen. CRH is a publicly listed multinational (IEX) with operations in 36 countries. The partnership provides Calduran with the backing and resources of a major international building materials group while maintaining local market leadership in the Netherlands.

Scale indicators5 records

Recent moves7 records

Expansion highlights5 records

Broad incumbents

• CRH plc: CRH is Calduran's parent and one of the largest building materials groups globally (36 countries). Other CRH subsidiaries (aggregates, ready-mix, concrete products) are adjacent rather than direct calcium-silicate competitors, but the parent controls strategic capital allocation for Calduran.
• Wienerberger AG: Wienerberger is the world's largest producer of clay bricks and a major wall-systems supplier in Europe. It overlaps with Calduran on residential wall systems but via a different material (clay rather than calcium silicate) and a much broader product portfolio.
• Saint-Gobain S.A. Saint-Gobain's Weber, Isover, and plasterboard businesses serve the Dutch construction market with wall-envelope systems. It does not directly produce calcium silicate but competes at the wall-system specification level for residential and commercial projects.
• Heidelberg Materials AG: Heidelberg Materials is a global cement and aggregates group with European wall-system exposure via Calcestruzzi and other subsidiaries. It overlaps with Calduran only indirectly but competes for the same Dutch contractor budget on wall and foundation packages.
• Holcim Ltd: Holcim is a global cement, aggregates, and concrete-products major that competes broadly in residential wall and envelope systems through ready-mix concrete, precast, and lightweight solutions. It addresses the same Dutch construction customer base with a wider, cement-led portfolio.

Direct peers

• Calenberger Kalksandsteinwerk GmbH & Co. KG: Calenberger is a German producer of sand-lime bricks and elements with a comparable product portfolio (KS blocks, elements, system mortars). It is a direct competitor to Calduran in the German-speaking part of Calduran's geographic footprint.
• Emsland-Kalksandsteinwerk GmbH & Co. KG: Emsland is one of the leading German sand-lime brick manufacturers with multi-plant capacity, directly comparable to Calduran in product mix (KS blocks, elements, lintels) and in serving the Benelux/NRW construction market.
• Xella International GmbH: Xella is the largest European manufacturer of calcium silicate units (under the Silka brand) and autoclaved aerated concrete (Ytong, Hebel). It is the closest direct competitor to Calduran in calcium silicate wall systems across Western Europe, including Benelux and Germany.
• Baustoffwerke Havelland GmbH & Co. KG: Havelland operates sand-lime brick plants in eastern Germany producing KS blocks and elements, competing directly with Calduran for cross-border German demand and on similar system-mortar-based wall solutions.

Emerging players

• Kingspan Group plc: Kingspan is a leading insulated-panel and building-envelope manufacturer. Its insulated wall and façade systems compete with sand-lime wall packages in mid-rise Dutch construction on speed and thermal-performance grounds.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

• Xx.com/caldurancrh

Compliance10 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles10 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 Calduran Kalkzandsteen