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CHAS Advanced · NFRC · Reset ComplianceThe brief.
Tees, Esk and Wear Valley NHS appointed Evenii to resolve water ingress at Eastfield Clinic in Scarborough. The existing flat roof covering had become porous and was no longer providing a reliable watertight line over the clinical estate below.
The clinic is an occupied healthcare facility. The brief was to restore the waterproofing performance of the roof with minimal disruption to clinical operations, to programme the works around the clinic's use of the building, and to deliver the works on time and within an agreed budget.
Scarborough sits within Evenii's North Yorkshire service area, and the works were programmed as routine regional public-sector roofing rather than a one-off specialist commission.
02 — Diagnosis and decisionDiagnosis and the decision to use a liquid-applied system.
The existing flat roof covering was assessed and confirmed as porous. Water was tracking through the covering, the perimeter details and the upstands, with knock-on risk to the clinical fabric and finishes inside the building. Patch repair on a porous covering was not a credible long-term answer.
Evenii recommended a Triflex liquid-applied roofing system installed over the existing covering. That route addressed the water ingress directly, kept the existing roof structure and falls in place, and avoided the disruption, cost and programme of a full strip and renew on an occupied NHS clinic.
A liquid-applied system was also the right fit for the geometry. The existing roof carried the usual mix of upstands, perimeter edges, penetrations and details that a sheet membrane struggles to follow cleanly. Triflex was selected because it could form a continuous waterproofing line across the field of the roof and dress every detail without relying on dressed-in laps.
03 — Specification and materialsSpecification and materials.
The specification was a Triflex liquid-applied roofing system installed over the prepared existing covering. The system was selected for its compatibility with the existing substrate, its ability to follow complex details and upstands and its long-term service life on healthcare roofs.
Surface preparation was a defined work item, not an assumption. The existing porous covering was cleaned, primed and prepared to manufacturer requirements so the Triflex system could bond properly and perform to specification. Details, upstands and penetrations were specified to be dressed and waterproofed as part of the same continuous line.
The roof structure and falls were left as built. There was no requirement to alter the deck, the insulation arrangement or the drainage falls to deliver the agreed waterproofing performance — a deliberate decision to keep the works proportionate to the defect and the budget.
04 — Site delivery around an active clinicSite delivery around an active clinic.
Eastfield Clinic remained operational throughout the programme. Access, scaffold, materials handling and the sequence of works were planned around the clinic's use of the building, with safe pedestrian routes maintained and clear coordination with the NHS site team.
Weather protection was planned into the programme. A liquid-applied system needs the right substrate, temperature and weather window to install correctly, and the works were sequenced so the existing covering was not opened up beyond what could be made watertight inside the same shift.
Communication with the client team was treated as a deliverable in its own right. The NHS facilities team had visibility of the programme, access arrangements and any reactive items, so the clinic could continue to operate and the works could progress without surprises.
05 — OutcomeOutcome.
The roof was handed back watertight. The Triflex liquid-applied system resolved the water ingress, restored a continuous waterproofing line across the field and the details, and extended the service life of the roof without altering the existing structure or falls.
The works were completed on time and within the agreed budget. The clinic continued to operate throughout the programme and the NHS estates team received a refurbished roof on a covering that had previously been a recurring maintenance and disruption risk.
For NHS estates, local authority property teams and public-sector facilities managers considering Evenii for flat roof waterproofing in North Yorkshire, this project is a useful reference point — a defined defect, a proportionate Triflex specification and a delivered outcome on an occupied healthcare building.
