Cellecta HEXATHERM XMD 66mm Inverted Roof Upstand Board

66mm Cellecta HEXATHERM XMD boards are a high-performance inverted roofing solution that combine the excellent thermal efficiency of HEXATHERM extruded polystyrene (XPS) insulation with a durable, high-impact resistant facing board. This engineered construction provides long-lasting protection for vertical roof upstands, where exposure to weather, moisture and mechanical damage is most severe.

Specifically developed for inverted roof systems, 66mm Cellecta XMD boards help safeguard critical roof perimeter details, including parapet walls and edge upstands, ensuring the long-term performance and stability of the overall roofing structure.

The closed-cell XPS core delivers consistent thermal insulation and high resistance to water absorption, while the reinforced facing layer enhances durability against impact and site handling damage. Together, these properties make 66mm XMD boards a reliable choice for both commercial and residential flat roofing applications.

Key Benefits

• High-performance XPS insulation core for reliable thermal efficiency
• Impact-resistant facing board for enhanced durability
• Designed for inverted roof vertical upstand applications
• Excellent resistance to moisture and weather exposure
• Helps protect parapet walls and roof perimeter details
• Suitable for new build and refurbishment projects
• Supports long-term roof system performance and stability

Product Specifications

1. Brand: Cellecta HEXATHERM XMD
2. Thickness: 66mm
3. Insulation Core Thickness: 60mm XPS
4. Facing Board Thickness: 6mm
5. Board Size: 1200mm x 2400mm
6. Coverage per Board: 2.88m²
7. Boards per Pallet: 15
8. Coverage per Pallet: 43.20m²
9. Density: 30kg/m³
10. Thermal Conductivity (λ): 0.033 W/mK
11. Compressive Strength: 300 kPa
12. Strength at 2% Compression: 125 kPa
13. Long Term Water Absorption: 0.7%

Application

66mm HEXATHERM XMD vertical upstand boards are designed for use in inverted flat roofing systems where additional protection is required at exposed vertical detailing. They are commonly installed at: 1. Roof parapet walls 1. Vertical roof upstands 1. Roof perimeter edges 1. Inverted flat roof perimeters 1. Commercial and residential roofing systems

The system is ideal for areas exposed to harsh weather conditions, impact risk and long-term moisture exposure, helping maintain insulation performance and structural protection at critical junctions.

Installation Overview

Cellecta 66mm XMD boards are designed for straightforward installation within inverted roofing systems. The boards should be accurately cut and fitted tightly against vertical upstands to ensure continuous insulation coverage and minimise thermal bridging.

They are typically installed in conjunction with the waterproofing system and other roof build-up layers, forming part of a complete inverted roof specification. Once installed, they contribute to improved thermal efficiency, enhanced durability and long-term protection of roof edge details.

Installation should always follow project-specific detailing and manufacturer guidance to ensure full system performance.