#overtec

Cement production alone is responsible for roughly 7% of global CO₂ emissions - more than the entire global aviation industry combined. As governments, investors, and certification bodies tighten requirements around embodied carbon, the choice of building material has moved from a background technical decision to a front-and-center sustainability strategy.

The good news: concrete isn't going away, and it doesn't need to. But sustainable building materials can meaningfully reduce the concrete footprint of a project by replacing specific components - like parapets, balustrades, and shaft elements - with lower-emission alternatives, without compromising performance.

The Case for Measuring Emissions at the Product Level

One of the biggest obstacles to sustainable construction isn't a lack of alternatives - it's a lack of comparability. Without standardized emissions data, it's difficult for architects, developers, and certification bodies to make informed material choices.

This is where the Environmental Product Declaration (EPD) becomes essential. An EPD documents the environmental impact of a specific product across its lifecycle - from raw material extraction through manufacturing, transport, and end-of-life. Having this data available for every product variant allows for direct, apples-to-apples comparisons between conventional and alternative building components.

Wood-Fiber Composite: What It Actually Is

Despite the name, engineered wood-fiber composite panels are neither pure wood nor pure concrete - they're a hybrid material sometimes described as "wood-concrete." The material consists of:

Fine wood particles, which act as reinforcement and provide workability and elasticity

Cement, which provides weather resistance and high compressive strength

Water and hydration additives, which bind the mixture together

This mixture is pressed at high pressure (around 300 bar) and then dried, producing a dense, dimensionally stable panel. The combination gives the material several practical advantages over either wood or concrete alone:

Fire resistant - suitable for demanding fire safety classifications

Frost resistant - stable in freeze-thaw cycles common in temperate climates

Weather resistant - holds up to prolonged exposure without degrading

Mold resistant - reduces long-term maintenance concerns

No insect infestation - unlike solid timber products

The technical baseline properties of this material class are defined in EN 13986:2004+A1:2015, though actual tested performance values are typically well above the code minimums.

Quantifying the Emissions Reduction

When compared directly to conventionally cast concrete elements performing the same structural role - such as a parapet or balustrade - wood-fiber composite systems have demonstrated emissions reductions of over 60% in like-for-like product comparisons. This reduction comes from two compounding factors:

Less material by volume. Because the composite achieves equivalent structural performance at a fraction of the thickness of concrete, far less raw material is required per linear meter of construction.

Lower embodied carbon per unit of material. The manufacturing process for wood-fiber composite panels is significantly less carbon-intensive than cement production and concrete curing at the volumes required for equivalent conventional elements.

The Indirect Emissions Savings Are Even Larger

The direct product-level emissions comparison is only part of the picture. Because wood-fiber composite elements are dramatically lighter than concrete equivalents, they trigger a cascade of indirect material savings elsewhere in the building:

Lighter support structures. Reduced dead load means ISO baskets and structural brackets can be sized smaller.

Thinner slab edges. Cantilevered balcony slabs can use reduced ceiling thickness at the edge, since they're not carrying the weight of an oversized concrete parapet or balustrade.

Fewer support elements. In some cases, additional support columns or brackets can be eliminated entirely.

None of these secondary savings show up in a simple product-to-product emissions comparison, but they compound to make the real-world sustainability benefit even larger than the headline number suggests.

Sustainability and Certification: DGNB, KfW, and Beyond

Green building certification systems like DGNB (Germany), and financing programs like KfW efficiency standards, increasingly require detailed carbon accounting at both the building and component level. Choosing materials with published EPD data - rather than generic industry averages - gives project teams a documented, defensible basis for certification submissions.

This also matters for developers targeting ESG-conscious investors, since transparent, product-level emissions data is increasingly expected as part of due diligence on new construction projects.

Making the Business Case: Sustainability and Efficiency Together

A common misconception is that sustainable building materials come at a cost premium with no offsetting benefit. In practice, wood-fiber composite systems often deliver value on multiple fronts simultaneously:

Lower embodied carbon, supporting certification and ESG goals

Reduced material costs per linear meter due to the slimmer profile

Faster installation, since prefabricated elements require less on-site labor

More usable floor and terrace area, as covered in our dedicated posts on parapets and balustrades

Frequently Asked Questions

Is wood-fiber composite as durable as concrete? Yes, when properly engineered and certified. The cement content in the composite provides comparable weather resistance and compressive strength, while the wood fiber component adds elasticity that concrete lacks, reducing the risk of cracking.

Can EPD data be obtained for every product variant? Reputable manufacturers publish EPD data broken down by specific product variant and thickness, allowing for precise emissions calculations tailored to a specific project's bill of materials.

Does using sustainable materials slow down construction? Generally the opposite - prefabricated sustainable building materials typically reduce on-site labor and construction time compared to wet-trade methods like poured concrete.

Conclusion

Sustainable building materials are no longer a niche consideration reserved for flagship green buildings - they're becoming a baseline expectation across the construction industry. Wood-fiber composite systems demonstrate that sustainability and performance aren't in tension: by rethinking specific high-impact components like parapets and balustrades, developers can cut emissions substantially while also gaining usable space and construction speed.