Planning a Public-Sector Roof Refurbishment

Introduction

Public-sector roof refurbishment usually happens on buildings that stay in use: schools, hospitals and clinics, offices, courts, libraries, depots and housing. Alongside the technical work, there is normally a governance layer, business cases, procurement rules, reporting and an audit trail that has to stand up afterwards.

Budget matters, but the lowest tender is not always the lowest final cost. What tends to determine the outcome is how well the scope, the building constraints and the documentation requirements are understood before the scheme is priced.

Procurement routes and what they change

Public-sector roofing work is commonly procured through one of a few routes:

• Direct award or quotation for smaller reactive and repair work
• A mini-competition or further competition under an existing framework
• An open or restricted tender for larger capital schemes

The route affects timescales, the evidence a bidder has to submit and how much room there is for pre-tender technical discussion. It does not change the underlying requirement: a scope that reflects the actual condition of the roof, and a price based on that scope.

Why condition evidence comes first

Where a scheme is priced from a general description rather than survey evidence, the risk moves into the contract as variations. Useful evidence before pricing normally includes:

• The existing build-up, confirmed by opening up or core sampling where appropriate
• Whether trapped moisture is present in the insulation or deck
• The condition of the deck, fixings, laps and details
• Drainage performance and outlet capacity
• Fragility of rooflights and any existing access or fall protection
• Asbestos information for the roof and adjacent fabric

A roof survey is the usual way to establish this. For an occupied public building it also establishes the constraints that shape the programme.

Delivering on an occupied public building

Most public-sector roof projects have to be planned around the operation of the building. The items that most often shape the programme are:

• Separation of the works from building users, including access, scaffold and loading routes
• Noise, dust, odour and fume controls, particularly near teaching, clinical or residential areas
• Phasing so that critical rooms, wards or exam spaces remain usable
• Safeguarding requirements, including DBS checks for operatives where the client requires them
• CDM 2015 duties, with the Principal Contractor role held by whoever is appointed to it
• Out-of-hours or holiday-period working where daytime working is not workable

These need to be designed into the method statements and the programme, not resolved on site.

Documentation and audit trail

Public-sector clients generally need to be able to evidence how the work was procured, delivered and signed off. Typical requirements include:

• Pre-construction information and a construction-phase plan
• Site-specific risk assessments and method statements
• Evidence of operative competence and relevant training
• Material delivery records and waste transfer documentation
• Inspection and test plans with sign-off at key stages
• As-built information, guarantee documentation and O&M data at handover

Where this is agreed early, handover is straightforward. Where it is raised at the end, it delays sign-off even when the physical work is sound.

The problem with pricing on description alone

Where a competition is decided almost entirely on price, and the scope is loosely described, bids tend to converge on the cheapest defensible interpretation of the work. The gaps then surface as variations once the roof is opened up.

Clients who want cost certainty usually get closer to it by:

• Establishing condition before the scheme is priced
• Describing the scope, exclusions and provisional items explicitly
• Asking bidders how they have allowed for trapped moisture, deck repair and fragile rooflights
• Weighting delivery and programme criteria alongside price

Guarantees and what they actually cover

Guarantee arrangements differ by system and by manufacturer, and the terms depend on the survey findings, the specification and the installation. Product guarantees, workmanship warranties and insurance-backed guarantees are not interchangeable, so it is worth confirming at tender stage:

• What is covered, for how long, and by whom
• Whether cover applies over the existing construction or only to a stripped deck
• What inspection or maintenance regime is required to keep it valid

Our article on commercial roof guarantees sets out the differences in more detail.

What to establish before the scheme is priced

Before a public-sector roof scheme goes out to tender or mini-competition, it helps to have settled:

• The condition evidence and the resulting scope
• The operational constraints of the building and the workable programme windows
• The documentation, reporting and social-value information the client requires
• Which items are fixed and which are provisional
• Where the risk on unknowns is intended to sit

Conclusion

A public-sector roof refurbishment tends to go well when the condition of the roof is established first, the constraints of an occupied building are designed into the programme, and the documentation requirements are agreed at the start rather than at handover.

Pricing a scheme with those things unresolved moves cost and risk into the construction phase. Establishing them first is what makes a tender comparable and a final account predictable.

If you are planning a public-sector roof project, TRS offers a free initial roof survey as a starting point for condition evidence and scope. TRS is a roofing contractor rather than an independent consultancy, so any recommendation should be read on that basis.

Get in touch to arrange a visit.