When a roof starts to deteriorate, a full replacement is not always necessary.

Roof over-cladding offers a faster and more cost-effective alternative by fixing new insulated roofing sheets directly over the existing roof.

This popular alternative to full roof replacement is ideal for commercial and industrial buildings who need fast results with minimal downtime.

At Cardinal Steels, our insulated metal roofing sheets are suitable for over-cladding, providing a durable and efficient way to upgrade an ageing roof.

 

How Does Roof Over-Cladding Work?

 

Roof over-cladding fixes new metal sheets above the existing roof.

The old roof structure stays in place, which speeds up installation and limits downtime.

 

Here’s how it works:

Inspection

• The existing roof, purlins and supports are checked for corrosion, rot or structural failure.
• The structure must safely carry the added weight of the new sheets.

 

Preparation

• Dust, debris and loose materials are removed.
• Surfaces are levelled where needed to ensure stable fixing points.

 

Installation of New Purlins

• Additional purlins may be fitted to increase load capacity.
• These create secure fixing lines for the new cladding.

 

Laying The New Roof Sheets

• Insulated metal sheets are placed over the old roof and lapped to prevent water leaks.
• Sheets are fixed to the purlins using appropriate fasteners.

 

Final Inspection

• Alignment, fixings and sheet condition are checked.
• Gutters and drainage routes are cleared to ensure correct water flow.

 

Why is Roof Over-Cladding a Smart Choice?

 

Roof over-cladding offers several measurable advantages compared with full roof replacement.

• Cost Effective: Roof over-cladding avoids labour and disposal costs associated with full replacement, reducing overall material usage making it suitable for large commercial buildings.
• Quick Installation: Over-cladding projects can be completed in days rather than weeks, minimising down time for businesses.
• Durable and Reliable: The modern metal insulated roofing sheets provide long-term weather protection, stopping leaks and protecting the underlying structure from further damage.
• Environmentally Friendly: Less waste is sent to landfill sites and the life of the existing roof is extended.

 

What Buildings are Suitable for Roof Over-Cladding?

 

Understanding what structures are ideal candidates for roof over-cladding is essential for ensuring safety, longevity and compliance with modern building standards.

A building is typically well suited to roof over-cladding if:

• The existing roof structure is still stable and free from major structural damage
• The purlins and rafters are strong enough to carry the additional weight
• The roof is not severely corroded or sagging
• The goal is to reduce downtime and avoid the cost of a complete roof replacement.

 

Conclusion

 

Overall, roof over-cladding is considered a smart, practical alternative to a full roof replacement.

From industrial units and agricultural buildings to workshops and garages, various properties can benefit from this approach.

At Cardinal Steels our insulated roofing sheets combine strength, weather resistance, longevity and advanced thermal performance to give your roof the upgrade it needs.

Contact us today to kickstart your roofing project.