- Insulating core bonded between two steel skins
- Single fix on site
- Consistent insulation thickness
- Reduces rain noise
- Made to order
Online Calculator
Follow our step by step calculator to get your steel roofing quote direct from Cardinal Steels
Composite Insulated Panels
A composite panel arrives as one component: a rigid insulating core bonded between an outer and an inner steel skin. It is fixed in a single operation, rather than assembling a liner sheet, spacers, insulation and an outer sheet separately on the roof.
That single difference is what makes composite the usual choice on new build. Fewer operations at height means less time on the roof, and a factory-bonded core means the insulation is the same thickness everywhere rather than however it ended up being laid.
Composite against twin skin
A twin skin system builds the same layers up on site. It is more adaptable where the geometry is awkward and can be assembled around existing structure, but it takes longer and depends on the quality of the installation for its performance.
Composite trades that flexibility for speed and consistency.
What it improves
- Heat loss through the roof
- Condensation on the inner face
- Rain noise, because the bonded core damps the drumming
- Installation time and the number of components on site
Cold bridging
With a continuous bonded core, the significant thermal path through a composite panel is at the fixings and the joints. That is a much smaller problem than a built-up system with gaps in the insulation, but it is not nothing, and it is why panel joints and fixing detail matter. Our guide to stopping cold bridging covers where bridges usually occur.
Existing buildings
Where a building already has a sound covering, overcladding is often the better route than stripping the roof off to fit composite. It keeps the building in use and avoids the waste of a full replacement.
Everything is made to order at our Bromsgrove facility and cut to your exact sizes. Choose from plastisol, polyester paint or plain galvanised finishes in 16 colours, with nationwide delivery within 7 days and a 48-hour express option on request, subject to availability and additional charges.
NEED HELP? GET IN TOUCH
What Coatings Do We Offer?
We always recommend our PVC Plastisol-coated sheets due to their cost-effectiveness and excellent resistance to abrasion and corrosion. Polyester-coated sheets are also a high-quality, versatile option suitable for both box profile and corrugated roofing sheets. However, care must be taken to avoid scratching during handling and installation.

Galvanized
- Shiny/Dull silver colour in finish.
- Available in 0.4mm up to 0.7mm thickness.
- No Guarantee available.

Polyester
- Gloss finish.
- Available in 0.4mm up to 0.7mm thickness.
- Up to 15 years guarantee.

Plastisol
- Gloss finish.
- Available in 0.4mm up to 0.7mm thickness.
- Up to 25 years guarantee.
Tell us the roof area and how the building is heated.
