Cork roof coating for roofs worth keeping.

Is your roof worn out, or just tired?

Many roofs that look finished are still structurally sound underneath. A tired coating, rust bloom on fixings or a history of patch repairs does not always mean full replacement.

The people who contact me about roofs usually want to stop paying for the same repairs every year and get it sorted properly, without the cost and disruption of stripping and re-roofing. That is a reasonable aim, and a coating can be the right answer when the roof deserves it. When it doesn't, I will tell you.

Can cork coating help a hot, noisy metal roof?

It can help, but I won't promise a figure without looking at your building. Metal roofs on workshops, industrial units and agricultural buildings heat up fast in summer sun and drum loudly in heavy rain, which makes them hard places to work.

Cork slows heat moving through it and a light-coloured finish reflects more sunlight, which is why the manufacturer recommends light colours for thermal applications. The coating also adds a softer layer on top of the metal, which can take the edge off rain noise. How much difference you notice depends on:

• the roof build-up and any insulation already under it
• the coating specification and colour
• how much direct sun the roof gets
• whether heat is really coming through the roof, or through walls, rooflights, glazing or machinery inside

In winter any added thermal resistance slows heat loss a little. The coating does not produce heat, and the overall result depends on the whole building. If someone promises you a set temperature drop or energy saving without evidence for your roof, ask them where the number came from.

What do you check before recommending a roof coating?

I start with how the building is used and when it becomes uncomfortable, then I look closely at the roof itself. A coating only lasts if the surface and details underneath are sound.

• the condition of sheets or the roof surface, including corrosion and any soft or damaged areas
• existing coatings and whether they are well bonded
• laps, joints, ridges and flashings
• fixings, washers and any rust around them
• gutters, valleys and places where water sits after rain
• safe access, including edge protection and whether any part of the roof is fragile

Failed details and underlying defects are repaired as part of the specification. If I suspect a fibre cement roof may contain asbestos, it needs an asbestos survey first, and the work follows the approach on my asbestos encapsulation page.

Is coating cheaper than replacing the roof?

Often it costs less upfront and causes less disruption, but the right choice depends on the roof. Here is how I compare the two with clients.

I explain the expected service life, maintenance and the warranty that applies, so you can decide with the full picture rather than just the price.

What signs suggest a roof could suit a cork coating?

A roof is a good candidate when the structure and sheets are sound but the surface is tired. Typical signs include:

• an old coating that is chalky, faded or starting to peel
• surface rust around fixings or laps, without holes through the sheet
• repeated small patch repairs in the same areas
• a building that gets uncomfortably hot under the roof in summer
• loud drumming in heavy rain that makes phone calls or work difficult

Signs that point towards repair or replacement first are sagging, holes rusted through, cracked or broken sheets, and wet insulation or rotten timbers underneath. Coating will not fix any of those.

How long does a cork roof coating last?

Applied correctly over a well prepared roof, a cork coating is designed to last many years with simple maintenance. The warranty depends on the product and the roof, so it is written into your quote rather than promised in advance.

Maintenance is mostly common sense: keep gutters and valleys clear, look over the roof after storms, and deal with any mechanical damage early. Your aftercare plan lists what to check and when.

I am a SprayCork UK approved applicator. I follow the supplier's specification closely and set every stage out in writing.

Which roofs do you coat?

I offer it for workshops, small industrial and commercial units, agricultural buildings, garages and outbuildings around Walsall, Sutton Coldfield, Cannock, Lichfield and the wider West Midlands. I am a SprayCork UK approved applicator and apply the system to the supplier's specification. If you would like to see how a job runs, read how it works. For walls and render, see the spray cork overview and external cork coating.