Source · category
Flooring
Also: floor covering, floor coverings
The largest continuous surface in a room, and therefore the source with the greatest area. Resin-bonded boards, adhesives, backings and finishes release formaldehyde and volatile organic compounds; textile floors also hold dust, allergens and semi-volatile compounds and release them when disturbed.
Why it matters indoors
Flooring covers the whole footprint of a room, so even a low emission rate per square metre becomes a meaningful concentration once it is multiplied by twenty square metres and divided by the room’s ventilation. That arithmetic is what makes flooring different from a single piece of furniture, and it is the reason emission classes for floor products are expressed per square metre — the tool at emission rate to concentration does the step from the label to the room.
What flooring emits
Two families of emission, depending on how the floor is built. Resin-bonded products — laminate, engineered wood, some parquet — release formaldehyde from the adhesive in the core, and volatile organic compounds from finishes and from the wood itself. Resilient and adhesive-laid floors add plasticisers and solvent residues, which are heavier and end up in dust rather than in air. Reviews of emission data for building materials and furnishings put flooring and its adhesives among the highest-emitting product groups in a finished interior.
Textile floors behave differently
A carpet emits little after the first weeks, but it is a reservoir: dust, allergens, semi-volatile compounds and shoe-borne material settle into the pile and are released again when the floor is walked on or vacuumed. Whether that is a net loss or a net gain for the air in the room is genuinely disputed in the literature, and the answer depends on cleaning frequency and on who is in the room. This is set out on the carpets page.
What decides how much
Age, temperature and ventilation, in that order. Emission decays over weeks to months after installation and rises with temperature and humidity, so a floor laid in a warm, closed room in summer will produce its peak concentration in the first days. Installation matters as much as the product: glued, floating, and mechanically fixed floors put different amounts of adhesive into the room for the same board.
Choosing
Emission class describes the board under chamber conditions, not the room — the loading, ventilation and temperature of the actual space decide the concentration. Ask for the area-specific emission rate on the technical sheet rather than the class alone, ventilate deliberately for the first weeks after installation, and treat the adhesive as part of the product.
What the studies report
| Linked to | Effect | Population | Study design | Source | Checked |
|---|---|---|---|---|---|
| Radon | mean 327 | office workers · basement workroom with parquet flooring | case study of radon in workrooms of a thermally retrofitted public building in Serbia: one-month continuous measurement with a digital detector in 10 workrooms during the 2018/19 heating season and charcoal canister measurements in all basement workrooms in spring 2021, grouped by flooring type | F-0628 Gulan Radon levels and indoor air quality after application of the… (2023) | machine |
| Radon | mean 227 | office workers · basement workroom with ceramic tiles | case study of radon in workrooms of a thermally retrofitted public building in Serbia: one-month continuous measurement with a digital detector in 10 workrooms during the 2018/19 heating season and charcoal canister measurements in all basement workrooms in spring 2021, grouped by flooring type | F-0629 Gulan Radon levels and indoor air quality after application of the… (2023) | machine |
Each row is one Finding — a sentence as printed in one study, recorded with its page in the Coridum Knowledge Base. Follow the Finding number for the exact wording and the citation. Checked says who verified the row: machine means every automatic check passed and the surrounding text was read; person means someone read the sentence in the document. Rows are re-checked by a person over time. The studies are curated in the Coridum Knowledge Base; the reading of them together is a Claim, shown separately.
Identifiers
- MeSH
- D005430
In the literature
- Laminate flooring and indoor air emissions - 2010 document (2010). CKB 0126
- A review of volatile organics emission data for building materials and furnishings… (1997). doi:10.4224/20338000 CKB 0114
- Built environment and indoor air quality - The case of volatile organic compounds… (2021). doi:10.3934/environsci.2021010 CKB 0178
- Haines et al. Ten questions concerning the implications of carpet on indoor chemistry and microbiology Sarah R. Hainesa, Rachel I. Adamsb, Brandon E. Boorc, Thomas A. Brutond, John Downeye, Andrea R. Ferrof, Elliott Gallg, Brett J. Greenh, Bridget Hegartyi, Elliott Hornerj, David E. (2019). Building and environment. doi:10.1016/j.buildenv.2019.106589 CKB 0031
Studies in the Coridum Knowledge Base in which this term is used. The definition follows standard usage in WHO, ISO and textbook sources; it is not quoted from these papers.
CKB = document number in the Coridum Knowledge Base, our curated library of peer-reviewed studies. Follow the DOI for the original paper.
Cite this page
Coridum Research. Flooring. Coridum Knowledge G-0094, 16 September 2026. https://coridum.com/k/G-0094/