Bury St Edmunds Roofers handles commercial roofing in Sudbury from the first survey through to the final clean-up, covering flat roof systems, single-ply membranes, built-up felt and profiled metal for offices, warehouses and retail premises.
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Many businesses commissioning roofing work for the first time are not sure what to expect or what to look out for at each stage. A professional job follows a clear sequence, and understanding that sequence helps you judge whether the contractor in front of you is approaching the work correctly.
Below is an honest account of each stage, from the initial survey through to handover, with notes on what a proper job involves and what questions are worth asking along the way.
A proper commercial roof survey is not a quick look from the car park. For a flat roof, the surveyor needs to be on the roof surface, checking the covering in detail. On a felt system that means checking laps, surface condition, blister formation and any previous repair patches. On single-ply or EPDM, seam integrity and detailing at upstands, outlets and penetrations need close inspection. On metal roofing, the focus is on fixings, laps, ridge and eaves details, and flashing conditions.
The survey should also look at the outlets and drainage to see whether ponding is occurring, and at the underside of the deck where accessible, to check for signs of moisture ingress or structural movement. A surveyor who spends ten minutes on the roof before quoting a full replacement has not done a survey - they have made an assumption.
The outcome of the survey should be a clear description of what is wrong, why it has failed, and what the correct remediation involves. That information is what a fair and accurate price is based on.
Once the survey is complete, the specification should be written up clearly. For a flat roof, this means stating the system being installed, the number of layers, the insulation specification (including thickness and type), how the membrane is being fixed or bonded, and how details at outlets, upstands and penetrations are being handled.
Vague quotations that say only "supply and fix new flat roof covering" give you no basis for comparing quotes or checking that the work has been done correctly once it is complete. Ask for the specification to be written out in enough detail that you could hand it to another contractor for a like-for-like comparison.
For a standard commercial flat roof replacement in the UK, typical costs run from around £70-£100 per square metre for built-up felt, £85-£130 per square metre for EPDM rubber, and £100-£155 per square metre for single-ply membrane systems. Metal roofing costs depend heavily on the profile and specification but broadly range from £50-£90 per square metre for standard profiles. These figures are indicative: an accurate price requires a proper survey of the specific building and cannot be given without one.
Commercial roofing work almost always requires scaffolding or a mobile elevated work platform. For smaller flat roofs on single-storey buildings, tower scaffolding may be sufficient; for larger or higher buildings, a full scaffold is usually needed. The setup and takedown of access equipment is a material cost on any commercial job, and it should be itemised in the quote rather than buried in a single total.
For occupied premises in Sudbury, the programme of works matters. Stripping an existing roof covering exposes the building to weather, so the sequence of strip and re-cover needs to be managed section by section where a single-day completion is not possible. Ask the contractor what their approach is to overnight weatherproofing if the job will run over more than one day.
Materials are typically delivered before work starts. On commercial sites there should be a clear plan for where materials are stored, how waste is managed, and how the site is kept safe for other occupants or members of the public.
Once the old covering is stripped, the deck is inspected in detail. This is the stage where the full extent of any water damage becomes visible. Timber decks may have areas of rot that need to be cut out and replaced before the new covering goes on. Steel decking may show surface corrosion or deformation at fixing points. Any deck repairs should be completed before the new system is installed, not skipped in order to save time.
If the insulation is being replaced, now is also when the vapour control layer is checked or installed. On heated commercial buildings, a correctly positioned vapour control layer is essential to prevent interstitial condensation within the roof build-up. Skipping it or positioning it incorrectly is a common installation error on commercial roofs that causes progressive insulation saturation over time, reducing thermal performance and eventually damaging the deck.
The falls of the roof should also be assessed at this stage. If the existing deck has inadequate falls and ponding has been a problem, tapered insulation boards can be used to create positive drainage without altering the structural deck. This is a design decision that should have been made at specification stage, not improvised on the day.
Installation method depends on the system specified.
For built-up felt, layers are bonded sequentially using hot bitumen or cold adhesive, with each lap carefully bonded and rolled. The cap sheet is laid last and the surface checked for voids or unbonded areas before flashings are dressed in.
For EPDM, the membrane is rolled out, trimmed to size, and bonded to the prepared deck using contact adhesive. Seams between sheets are bonded using seam tape or adhesive and rolled firmly. All penetrations and upstands are detailed using separate membrane pieces, bonded and integrated into the field membrane. The bond at these detail points is where leaks most commonly occur on EPDM systems, and they need to be done carefully.
For single-ply membrane systems, sheets are either mechanically fixed to the deck through the insulation layer, or fully adhered. Seams are hot-air welded using calibrated equipment. A probe test should be run along every seam after welding to check for any areas where the weld did not take.
For profiled metal roofing, sheets are fixed to purlins with self-drilling screws and correctly rated neoprene washers. Laps between sheets follow the manufacturer's minimum specification, and ridge, eaves and verge flashings are fitted and sealed. Fixings are installed at the correct centres: under-fixed metal roofs are vulnerable to wind uplift.
The flat sections of a commercial roof are rarely where leaks start. The majority of failures occur at junctions: where the roof covering meets a wall, a parapet, a rooflight, a pipe penetration or plant equipment. Flashings must be correctly lapped, bonded or mechanically fixed, and sealed where they terminate against masonry or coping stones.
Outlets should be cleaned, checked and fitted with new dome covers or leaf guards where needed. The membrane or felt should be dressed into the outlet collar properly so there is no gap at the junction. Poor outlet detailing is a common source of localised leaks that are difficult to trace from inside the building.
Before the scaffold comes down, the completed roof should be inspected in detail. On single-ply systems this includes a probe check of all seams. On felt and EPDM systems it means checking all laps, flashings and penetration details by hand. Any areas that need correction should be addressed before access is removed.
Documentation for a commercial job should include a record of the system installed, the materials used and any deck repairs carried out. For larger projects this may also include photographic records of key stages. This information is useful if the building is sold or if a warranty claim against the material manufacturer is ever needed.
All waste from a commercial roofing job - stripped felt, old insulation, fixings and off-cuts - should be removed from site by the contractor. The area around the building should be left clean. Any skips or waste containers should be removed within an agreed timescale.
At handover, you should receive a clear description of what was done and any recommendations for ongoing maintenance - primarily keeping outlets clear of debris. Most commercial roofs benefit from an annual check of outlets and a visual inspection every few years; a good contractor will tell you this rather than wait for the next call-out.
Working from our base in Bury St Edmunds, we carry out commercial roofing for businesses in Sudbury and the wider Suffolk area. Whether you need a full roof replacement, a targeted repair, cladding and guttering work, or roofing carpentry following water damage, we follow the process described on this page - no shortcuts. Call us to arrange a survey of your commercial property and get a detailed, honest assessment of what the work involves.
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Call any time. Calls are answered day and night and passed straight to our roofers.
