Solutions: Multi Foil PhotonAir - New Build & Extension Roof Insulation
| Application | Rafter | Uvalue | Draped | Counter batten |
| Historic & Public buildings roof |
400 | 0.32 | 50mm PIR | |
| 0.60 | No additional | |||
| 600 | 0.30 | 50mm PIR | ||
| 0.59 | No additional | |||
| Contact us for bespoke solutions | ||||
Historic & Public Buildings Roof Insulation
Insulating historic and public buildings requires a sensitive, carefully considered approach. These projects often involve listed properties, heritage assets, schools, civic buildings, or places of worship where maintaining the original character and structural integrity is essential.
PhotonAir multi foil insulation provides a practical and sympathetic solution, delivering enhanced thermal performance while minimising impact on the existing roof structure.
A Sensitive Solution for Heritage Roofs
PhotonAir is an advanced 2‑in‑1 breathable multifoil insulation system that combines high‑performance thermal insulation with the proven reliability of Klober Permo® Air underlay. Installed in the same way as traditional breathable roofing felt, it integrates seamlessly into refurbishment and conservation roofing projects.
PhotonAir incorporates high‑density glass wool to reduce heat transfer, encapsulated between a perforated reflective lower layer and a breathable air membrane. This construction enhances thermal efficiency while allowing moisture to escape, significantly reducing the risk of condensation – a critical consideration in older buildings where trapped moisture can cause long‑term structural damage.
Importantly for heritage projects, PhotonAir can often be installed without altering the external roofline, preserving the visual character of historic and public buildings.
Specification for Historic & Public Buildings Roofs
Historic and public buildings frequently require flexible insulation strategies depending on conservation requirements and target performance levels. Typical configurations include:
400mm Rafter
- Target U‑Value: 0.32 W/m²K – 50mm PIR (counter batten)
- Target U‑Value: 0.60 W/m²K – No additional insulation
600mm Rafter
- Target U‑Value: 0.30 W/m²K – 50mm PIR (counter batten)
- Target U‑Value: 0.59 W/m²K – No additional insulation
These options allow specifiers to balance thermal improvement with the constraints of heritage preservation. In many listed or conservation projects, achieving moderate improvement without intrusive structural changes is often preferable to extensive alteration.
Key Benefits for Historic & Public Buildings
One of the primary challenges in historic roof upgrades is managing moisture while improving insulation. PhotonAir’s breathable construction supports effective vapour management, helping prevent condensation build‑up within traditional roof structures.
Additional benefits include:
- Minimal impact on roof height – can be installed without counter battens in certain specifications
- No separate vapour barrier required, simplifying installation
- Improved thermal performance without compromising architectural character
- Watertight protection during and after installation
- Suitable for refurbishment of schools, civic buildings, heritage properties, and public facilities
Because PhotonAir combines insulation and breathable membrane technology in a single product, it reduces the need for multiple layers. This is particularly valuable where structural depth is limited or where preserving original rafters and internal features is a priority.
Supporting Sustainable Heritage Upgrades
Improving the energy efficiency of historic and public buildings is increasingly important for meeting sustainability targets and reducing operational costs. However, upgrades must respect the building’s architectural significance and long‑term durability.
PhotonAir offers a balanced solution by:
- Enhancing roof thermal performance
- Reducing heat loss through the roof structure
- Managing condensation risk in older buildings
- Maintaining external appearance
- Supporting compliance with modern building standards where applicable
For conservation‑led refurbishments and public sector improvement projects, it provides a practical and responsible approach to roof insulation.
A Practical Choice for Refurbishment and Conservation Projects
Whether upgrading a historic town hall, refurbishing a school roof, or improving the efficiency of a listed property, PhotonAir delivers a modern insulation solution tailored to traditional structures. Its slim, breathable, multi‑layer design helps safeguard both thermal performance and building heritage.
By combining innovation with sensitivity to existing architecture, PhotonAir supports the sustainable future of historic and public buildings – improving comfort and efficiency while preserving character for generations to come.