Roof Overcladding Explained: Cost, Benefits & Expert Advice
Roof overcladding is the process of installing a brand-new protective roof layer over the existing one. It’s one of the most effective ways to extend the lifespan of industrial and commercial roofs across Scotland and the UK.
Thinking about overcladding your commercial roof?
What is Roof Overcladding?
Here’s a quick breakdown of how it works:
- 1. A bar system is secured through the old roof sheets into the structural purlins.
- 2. Insulation is rolled out between the old and new layers, improving thermal performance and reducing condensation.
- 3. New roof sheets are fixed into the bar system, sealed with mastic, and finished with flashings for long-term weather protection.
Get in touch with Industrial Roofing Scotland today by calling our team on 01592 372573 or filling in the contact form below.
Why Might an Industrial Roof Need Overcladding?
Industrial roofs are constantly exposed to harsh UK weather: heavy rain, strong winds, frost, UV rays, and occasional snow. Over time, even the best roofing systems degrade.
When repairs no longer solve recurring leaks, roof overcladding (aka over-roofing) becomes a cost-effective and sustainable alternative. It not only restores waterproofing but also improves insulation and reduces heat loss.
Learn more about our industrial roofing services.
Benefits of Roof Overcladding for Industrial Buildings.
Here’s a quick breakdown of some key roof overcladding benefits:
- Cost Savings – Typically 20–25% cheaper than full replacement
- Energy Efficiency – Adds insulation, reducing heating bills.
- Durability – Can last 20–40 years when properly installed.
- Low Disruption – Carried out with minor impact on business operations.
- Sustainability – Less waste sent to landfill compared to replacement.
Get in touch with Industrial Roofing Scotland today by calling our team on 01592 372573 or filling in the contact form below.
Roof Overcladding vs Roof Replacement?
When planning roof improvements, businesses often compare overcladding vs replacement. Both options achieve waterproofing, but they differ in cost, aesthetics, and performance.
Cost Differences
- • Overcladding: More affordable, saving 20–25% compared to replacement.
- • Roof Replacement: Higher upfront cost but may offer improved energy ratings and flexibility.
Thermal & Environmental Performance
- • Overcladding adds insulation but is limited by the old roof structure.
- • Replacement allows complete removal of outdated materials, making it easier to meet modern U-value targets.
Appearance & Skylight Design
- • Overcladding generally follows the existing roof layout.
- • Replacement offers more design flexibility, including repositioning skylights for better natural lighting.
Asbestos Concerns
Many industrial roofs built between the 1960s–1980s contain asbestos cement sheets.
- • Overcladding: Covers asbestos but does not remove it.
- • Asbestos roof replacement: Safely removes asbestos, eliminating the hazard.
Thinking about overcladding your commercial roof?
Step-by-Step Process of Roof Overcladding Explained.
- 1. Structural Survey – An engineer checks if the existing roof and purlins can bear additional loads. (See our roof surveys & inspections).
- 2. Preparation – The roof is cleaned, and any weak sections are repaired.
- 3. Fixing Bar System – Metal bars are secured to existing purlins.
- 4. Installing Insulation – Mineral wool or rigid board insulation is laid to improve energy performance.
- 5. Laying New Sheets – Galvanized steel or coated sheets are installed for weatherproofing.
- 6. Sealing & Finishing – Joints are sealed, and flashings are added to prevent water ingress.
- 7. Final Inspection – Quality checks ensure compliance with manufacturer and building regulation standards.
Common Mistakes in Roof Overcladding Projects.
From our industry experience, these mistakes can make or break a project:
- • Skipping Structural Checks – Without engineering assessments, roofs can fail under additional load.
- • Ignoring Manufacturer Guidelines – Incorrect installation voids warranties.
- • Lack of Documentation – Always demand warranties, work schedules, and certification. Reputable contractors will provide them.
Costs of Roof Overcladding in the UK.
The cost of roof overcladding depends on:
- Roof Size (Approx m2)
- Condition of the existing roof.
- Choice of insulation & sheet material.
- Complexity (rooflights, access, height, etc.).
On average, UK industrial roof overcladding costs range between £60–£90 per m², making it more affordable than replacement, which can exceed £70–£100 per m².
Sustainability and Energy Savings.
Roof overcladding isn’t just cost-effective — it’s environmentally responsible. By reusing the existing roof structure, it:
- • Reduces construction waste.
- • Improves insulation and lowers carbon emissions.
- • Extends building lifespan without major demolition.
According to UK Green Building Council, improving insulation and reducing waste are critical steps toward sustainable construction.
Thinking about overcladding your commercial roof?
Expert Tips for a Successful Roof Overcladding Project
- Get an independent structural survey before starting.
- Choose materials from trusted manufacturers with proven performance.
- Ensure the contractor provides warranties for both materials and workmanship.
- Ask for references from previous projects.
Thinking about overcladding your commercial roof?
Conclusion: Is Roof Overcladding Right for You?
If your industrial roof has reached the end of its service life, roof overcladding is often the most cost-effective, low-disruption, and sustainable solution. It delivers:
- A watertight protective layer
- Better insulation and energy efficiency
- Extended roof life of up to 40 years
- Reduced landfill waste compared to replacement
If your roof contains asbestos cement sheets, or you require a complete design overhaul, roof replacement may be the safer, longer-term option.
The key is preparation: carry out a structural survey, follow manufacturer guidelines, and choose a contractor who can provide full documentation and warranties.
Thinking about roof overcladding for your industrial building?
Contact our team today for a free consultation and structural survey.
Simply fill in the form opposite and one of our team will call to disuss your options or you can call us direct on 01592 372573 to log an enquiry.
Roof Overcladding Enquiry
FAQs: Roof Overcladding by Industrial Roofing Scotland
A: Roof overcladding involves installing a new roof layer over the existing one, adding insulation and protection.
A: When installed correctly, it can last 20–40 years.
A: Yes. On average, it costs 20–25% less than full replacement.
A: Yes, but asbestos remains in place. Full asbestos roof replacement is recommended if you want asbestos completely removed.
A: Absolutely — insulation is added between the old and new roof layers, improving thermal performance.
A: Typically between £60–£90 per m², depending on materials and complexity.
