Diss Roofers covers commercial roofing work in Elmswell and the surrounding area, taking jobs from the first survey all the way through to final sign-off.
Call any time. Calls are answered day and night and passed straight to our roofers.
Commercial roofing is not the same as turning up, stripping off some old tiles and nailing on new ones. On a business premises there are occupied spaces below, trading to protect, and often specific access constraints. Getting the sequence right from the beginning determines whether the job runs smoothly or causes unnecessary disruption. Here is what a properly managed commercial roofing job looks like at each stage.
Before any price can be given and before any work is planned, the roof needs to be seen properly. A survey on a commercial flat roof means getting onto the surface, walking the whole area, and looking at the condition of the covering, the upstands, the drainage outlets, the parapet copings and any penetrations such as pipework, vents or rooflights.
On a felt system, we look for blistering, cracking, delamination between layers, and standing water that indicates drainage problems or deflection in the deck. On a profiled steel sheet roof, the fixings, laps and ridge and eaves details all need checking. A good survey takes time. A rushed look from ground level, or a quick walk over one section of the roof, will miss things that add cost later.
Where there is suspicion of widespread water ingress or saturated insulation that is not visible to the eye, electronic leak detection or infrared thermography can be used to identify wet areas without stripping the whole roof back. These are specialist tools that are worth using on larger or more complex roofs before committing to a scope of work.
Once the survey is complete, a clear scope of work is put together. This sets out exactly what is to be stripped off, what is to be repaired or replaced, and what system will be installed. A good specification names the materials by type and, where relevant, by manufacturer, so there is no ambiguity about what you are getting.
On a flat roof replacement, the specification will state whether it is a warm roof or inverted roof build-up, the insulation type and thickness, the membrane system (such as built-up felt or EPDM), and how upstands, outlets and details will be treated. On a steel sheet job it will confirm the profile, sheet gauge, coating and the liner and spacer rail specification.
This is also the stage at which access is planned. Large commercial roofs often require scaffold, mobile elevated work platforms, or edge protection systems. The access method affects both cost and programme, and it needs to be agreed before work starts - not decided on the day.
On a flat roof replacement, the existing covering and insulation come off first. This is the stage at which the actual condition of the deck beneath is confirmed. Decks on older commercial buildings are often in worse condition than the survey suggests - rotten timber, corroded steel decking, or sections that have been covered over with previous layers without the underlying problem being fixed.
Any deck defects found at this stage must be repaired before the new covering goes on. Laying a new membrane over a compromised deck is false economy - the deck will continue to deteriorate beneath and eventually the covering will fail early. A reputable roofer will flag deck defects as they are exposed and agree any variation to the original scope before proceeding, rather than simply covering it up.
The stripping-off process also generates a significant volume of waste material. On a commercial roof this means skip hire or a similar waste removal plan. This should be included in the quotation - check that it is, because waste disposal adds real cost if it is left out of the initial figure.
With the deck repaired and cleaned, the new system goes down. On a warm-roof flat system the sequence is: vapour control layer to the deck, insulation boards mechanically fixed or bonded, then the waterproofing membrane over the top.
On a built-up felt system the membrane layers are bonded in sequence, with the final capsheet typically mineral-faced for UV protection. Details - upstands, drainage outlets, rooflights and penetrations - are completed as the work progresses, not left to the end. Rushing the details is where most flat roof failures begin.
On an EPDM single-ply job the large rubber sheets are unrolled, positioned, and either adhered to the insulation or mechanically fixed at the perimeter. Seams between sheets are bonded using contact adhesive and tape, and the finished surface is continuous with no exposed laps. Outlets and upstands are dressed using pre-formed EPDM details or liquid-applied flashing tape.
On a profiled steel sheet replacement the liner sheets go in first, followed by the spacer rail and insulation, then the outer profile sheet on top. Fixings are driven at the correct centres and fitted with neoprene washers that form a watertight seal around each fixing point. Ridges, hips and eaves are finished with matching cappings and sealed where required by the system.
Before the job is signed off, the completed roof should be inspected in full. All outlets should be confirmed clear and discharging freely. Upstand heights should be checked - current good practice requires a minimum of 150mm from the finished roof surface to any lap or termination. All perimeter details, cappings and flashings should be checked for security and continuity.
On a larger or more complex job, a post-installation inspection report is useful to have as a record. It confirms what system was installed, the specification used, and the condition of the roof at completion. This is worth asking for as part of the contract, particularly if the building is leased or managed on behalf of others.
A commercial roofing job leaves the site as it found it below. Offcuts, packaging, old membrane, and any scaffold or access equipment is removed. Drainage channels and outlets around the building are checked and cleared of any debris generated during the work.
Handover means you have a clear record of what was installed, and any product technical sheets or maintenance guidance that relates to the new system. Some covering systems - particularly single-ply membranes - have specific maintenance requirements such as annual cleaning of the surface and checking of bonded seams. Knowing this up front means the roof performs as intended over its full service life.
Commercial roofing costs depend heavily on roof size, access, system specified and deck condition found on strip-off. As a general guide:
These are indicative ranges. A proper survey is always required before a realistic figure can be given, because deck condition, access arrangements and detail complexity all affect the final cost.
Not every commercial roofing job is a full replacement. A repair is the right call when the problem is genuinely isolated - a split upstand flashing, a blocked outlet causing ponding, a single corroded fixing on a steel roof. Carrying out a targeted repair on a roof that is otherwise in sound condition makes financial sense.
The decision changes when the roof is old and showing widespread failure. On a built-up felt system that is more than 15-20 years old with multiple blisters, cracked upstands and areas of delamination, patch repairs are likely to cost more over the next five years than a single replacement carried out now. A survey will tell you which side of that line the roof is on.
If you have a commercial roof that needs a survey, or you are planning a replacement and want to understand the process and costs before committing, call us to book a site visit and we will walk you through it.
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Call any time. Calls are answered day and night and passed straight to our roofers.
