Zentia is in administration. Your project specifies Zentia. Here's what happens next.

What has happened

Zentia Ltd, the UK manufacturer of mineral fibre ceiling tile and grid systems formerly trading as Armstrong Ceilings UK, entered administration in 2026. The Ultima, Sierra and Dune tile ranges and the Prelude grid system, which have been specified across UK commercial interiors for decades under first the Armstrong and then the Zentia brand, are affected by the administration process.

For projects with Zentia named on the drawings, whether in a live tender, a live construction programme or a refurbishment specification not yet out to price, this creates a practical question. What does the specifier, the main contractor or the procurement lead do when the manufacturer of a specified product has entered administration?

The answer, in almost every case, is the phrase your specification already contains. Equal or approved.

What "equal or approved" actually means

Equal or approved is standard UK specification language. It appears in the vast majority of tender documents and architectural specifications for a reason. It gives the delivery team the ability to substitute a specified product with an equivalent one, provided the substitute meets the original performance criteria and is approved by the specifier before installation.

The phrase is not a loophole. It is a procedural route. It works like this.

The main contractor, or in most cases the specialist installer, identifies a product that matches the original specification on every metric that mattered to the designer. Acoustic absorption performance. Light reflectance. Fire rating. Edge detail. Grid compatibility. Humidity tolerance. Visual finish. The alternative is submitted to the specifier, usually with technical data sheets and a comparison table, and the specifier either approves the substitution or requests further information.

The substitution is documented. The project record shows what was originally specified, what was substituted, and why. That documentation matters at handover and at any later date if the ceiling is repaired, extended or replaced.

The three principal alternatives to Zentia in the UK

Three manufacturers cover the mineral fibre ceiling tile specification points that Zentia previously served in the UK market. Each has product ranges that map to Zentia Ultima, Sierra and Dune at broadly equivalent specification levels.

Rockfon manufactures stone wool ceiling tiles across acoustic, hygienic and design-led ranges. Rockfon tiles are non-mineral-fibre by construction but sit at equivalent acoustic and light reflectance specification points to the Zentia range. Substitution against Zentia specifications is standard practice. Rockfon manufactures in Europe with UK stockholding.

Ecophon manufactures glass wool acoustic ceiling systems, again at equivalent specification points to the Zentia mineral fibre range. Ecophon is particularly well-established in healthcare and education specifications where acoustic performance and infection-control finish are both required. UK availability is via a mature national distribution network.

Knauf Ceiling Solutions manufactures mineral fibre ceiling tiles across product ranges that historically shared engineering DNA with the Zentia (Armstrong UK) range, following the earlier Armstrong World Industries structure. Knauf ranges map cleanly against Ultima, Sierra and Dune equivalents for substitution purposes.

Substituting between these three, and against Zentia specifications, is a well-trodden procedural exercise. What matters is that the substitution documentation is done properly and that the installer is technically competent on the substitute product.

What the specification substitution looks like in practice

On a live project, the equal or approved process runs roughly as follows.

The specifier's original tile is identified from the ceiling schedule or the reflected ceiling plan. Its performance criteria are extracted from the technical data sheet: acoustic Class, absorption coefficient, light reflectance percentage, fire rating, edge detail, tile size, humidity resistance rating and hygienic surface treatment where applicable.

A candidate substitute is selected from the alternative manufacturers, matched against those criteria. Where the substitute is stronger on any metric, it is accepted. Where it is weaker on any metric, the designer decides whether the weakness is acceptable within the design brief, or whether an alternative candidate is needed.

The substitute is submitted to the specifier with the comparison table and the manufacturer's technical documentation. Approval is confirmed in writing and attached to the project record. Installation then proceeds using the substitute product and the substitute manufacturer's installation guidance.

For a competent commercial ceiling installer, this process is routine.

What Eastledge does when Zentia is on the drawings

Eastledge has installed the Zentia (and historic Armstrong UK) mineral fibre ranges across UK commercial interiors since 1986. Ultima at Glenair Mansfield. Sierra Bioguard at Nottingham Trent University Clifton Campus. Dune at Charnock Hall School in Sheffield and across the Kia dealership at Burton-on-Trent. The Zentia specification base is familiar territory for our supervisors and fixers.

Following the administration, we can source equal or approved systems from Rockfon, Ecophon and Knauf Ceiling Solutions and install them against the original Zentia performance criteria on projects across the UK. We coordinate the substitution documentation with the specifier and the main contractor as part of the normal pre-installation submittal process. We install to the substitute manufacturer's current technical guidance on every project.

If your project has Zentia named on the drawings and you need a route through to installation, send the ceiling schedule, the reflected ceiling plan or the specification and we will come back with a comparison table and a clear next step within one working day.

Further reading

Read more about our approach to the Zentia and equal or approved specification process on the Zentia installer page. Product pages for the three principal alternatives are here: Rockfon, Ecophon and Knauf Ceiling Solutions. For a wider view of how we run commercial ceiling programmes, see the suspended ceiling installation service or contact us about a live project.