Annual maintenance risk
42
Moderate
Commercial roof tool
Roof lifespan & maintenance deficit
Estimate how age, covering, and roof area can compress remaining service life—and what delayed defect detection may cost on South Coast commercial stock.
12 years
New
20 yrs
40+ yrs
800 m²
100 m²
2,500 m²
5,000 m²
Indicated remaining life
18 yrs
vs ~35 yr design life for metal sheet
Neglect deficit
£12,400
Indicative exposure if latent defects shorten life unchecked
Reading
Standing water and seam fatigue typically emerge in this age band—worth a diagnostic flight before patch programmes escalate.
Indicative model only—not a structural survey, insurance valuation, or warranty. Real condition depends on detailing, exposure, and maintenance history. Solent Aero inspections find what is actually on the covering.
How to read the score
Designed for commercial landlords planning maintenance—not DIY replacement quotes.
UK commercial coverings fail differently: asphalt membranes dislike prolonged ponding; metal sheets suffer fastener and end-lap corrosion; composite systems hide joint movement; slate and tile lose integrity at ridges, valleys, and abutments first. Age alone never tells the full story—but age × material × area is enough to show when a silent defect load starts pulling replacement forward.
The maintenance risk score rises as the roof moves through its design life and as area increases (more seams, more drainage complexity). The neglect deficit translates lost service years into an indicative capital exposure using typical UK replacement cost bands. Use it to prioritise inspections—not to tender works.
Solent Aero flies the covering, finds defects for you, and issues a report you can hand to contractors or insurers—from £249 for standard buildings, with larger commercial stock quoted.