How Specification Drives Embodied Carbon: What Flooring Can Learn from BDP’s Design Carbon Report

BDP’s report, How Design Drives Embodied Carbon, makes a point the construction industry is still struggling to fully absorbed: embodied carbon is not simply “chosen” at the end of a project through product selection. It is designed in early.

The report analyses 44 multi-unit residential projects in Toronto and shows how decisions such as building form, density, window-to-wall ratio and envelope material selection affect upfront embodied carbon. BDP’s central finding is clear: the earlier carbon is considered, the more power the design team has to reduce it.
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The report focuses on the building envelope. But it also creates a question for suppliers of fixtures and finishes: what happens when the same discipline is applied to interior specifications, particularly our interest: flooring?

Flooring is often treated poorly in the design process. It is drawn, scheduled, swapped, value-engineered and reselected as if it were merely a surface finish. But flooring is not just an aesthetic layer. It is a material-intensive, high-use, long-life building component. It affects embodied carbon, maintenance, replacement cycles, cleaning regimes, indoor environmental quality, acoustic performance, slip resistance and procurement risk.

In other words, flooring is not a late-stage decorative decision. It is a carbon decision.

BDP’s report states that the envelope can represent a significant share of embodied carbon. Their point is not just that façades matter. Their deeper point is methodological: designers need carbon visibility before the project has hardened around the wrong assumptions.

That same principle applies directly to M50 floor finishes.

By the time a project reaches procurement, many of the meaningful flooring decisions have already been made or lost. The contractor may already be looking for substitutions that work better for them, not the project. The specification may say “or equal approved” without defining what equal means. The embodied carbon data may be missing. The maintenance burden may be ignored. The replacement cycle may be assumed rather than calculated. The floor may be chosen on capital cost while whole-life performance is quietly pushed out of view.

That is not sustainable specification. It is deferred consequence.

We feel a better approach is to bring flooring into the carbon conversation earlier. At Stage 2, the design team could be asking what kind of floor finish the project actually needs. Is PVC acceptable? Is a lower-carbon alternative required? Does the product have an EPD? What is the service life? How will it be cleaned? How often will it need replacing? What happens to the carbon calculation if the floor is replaced once, twice or three times over the life of the building?

At Stage 3, those questions should become specification criteria. Not loose language, but measurable requirements: declared embodied carbon, verified technical performance, slip rating, fire classification, acoustic performance, cleaning compatibility, durability and installation strategy.

At Stage 4, the specification needs to resist dilution. If a PVC-free rubber floor has been chosen because it supports the project’s carbon, health or maintenance objectives, then substitution should not be allowed unless the alternative can prove genuine equivalence. Not “similar appearance”. Not “cheaper”. Not “available faster”. Equivalent.

This is where rubber flooring deserves serious attention. In healthcare, education, laboratories, transport, civic buildings and commercial interiors, the floor is asked to do a lot. It must be durable, cleanable, safe underfoot and visually controlled. It must withstand traffic without becoming a maintenance liability. It must support the building’s environmental brief rather than undermine it after tender.

For us embodied carbon in flooring is not solved by green marketing. It is solved by manufacturers doing better, working harder and design teams specifying clearly and cleanly.

BDP has shown that design decisions drive embodied carbon in the envelope. The same thinking must now move through the rest of the building. Flooring should be part of that shift.

The next step is not to pretend every product choice is equal. It is to ask sharper questions earlier:

What is the floor made from?
What carbon data supports it?
How long will it last?
How is it maintained?
How often will it be replaced?
What does “equal approved” actually mean?
And does the final installed floor still match the environmental intent of the design?

Until those questions are asked early, flooring will remain vulnerable to the same old pattern: strong sustainability language at concept stage, weaker specification at tender, and compromised product selection on site.

BDP’s report is valuable because it moves embodied carbon upstream. Flooring specification needs to follow.

The floor is not an afterthought. It is one of the most used surfaces in the building. It deserves to be specified with the same carbon seriousness as the envelope, the structure and the services.

That is where better buildings begin: not with better slogans, but with better decisions made before the wrong ones become fixed.

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