Technical Guidance
Rainscreen cladding systems rely on a coordinated build-up of components to deliver performance, durability and compliance. Each layer within the façade system plays a specific role, from structural support through to moisture management and fire protection.
Understanding how these elements work together is essential for contractors and specifiers to ensure correct system design, installation and long-term performance.
A typical rainscreen build-up includes:
Each component must be correctly specified and integrated to achieve compliant and effective façade performance.
A rainscreen build-up refers to the full layered construction of a ventilated façade system, including all materials between the external cladding and the structural wall.
These systems are designed to manage moisture, support ventilation and protect the building envelope, while also accommodating structural movement and meeting fire performance requirements.
The external layer provides the first line of defence against weather and defines the building’s appearance. Materials may include fibre cement, HPL and specialist façade panels.
The sub-frame system provides structural support for the cladding panels and transfers loads back to the primary structure. It also allows for adjustment, alignment and movement within the façade.
👉 (Link “rainscreen sub-frame system” → Rainscreen Sub-Frame & Fixings page)
Insulation is installed behind the cladding system to improve thermal performance and energy efficiency. It also contributes to acoustic performance depending on the specification.
👉 (Link “insulation” → Insulation page)
Breather membranes are installed over the structural wall or sheathing board to protect against moisture ingress while allowing vapour to escape.
Fire performance is managed through the correct specification and installation of cavity barriers and fire stopping systems within the façade build-up.
Each layer within the rainscreen build-up performs a specific function, but the system only works effectively when all components are properly integrated.
Failure to coordinate these elements can lead to performance issues or non-compliance.
FGF supplies complete façade system components including cladding panels, sub-frame systems, insulation, membranes and fire protection materials.
👉 (Link “Make an enquiry” → Make an Enquiry page)
All components must be compatible, particularly where multiple systems interact within the façade.
Correct placement of cavity barriers and selection of materials is essential for compliance with UK regulations.
Ventilation and drainage within the cavity must be maintained to ensure long-term durability.
Sub-frame systems must accommodate wind loads, movement and installation tolerances.
Rainscreen systems are commonly used across:
Their flexibility makes them suitable for a wide range of building types and façade designs.
Understanding rainscreen build-ups is essential for ensuring façade systems perform as intended. By coordinating cladding, sub-frame systems, insulation, membranes and fire protection, contractors and specifiers can deliver compliant, durable and efficient building envelopes.
If you need support with rainscreen system design, product selection or compatibility:
👉 (Link “Make an enquiry” → Make an Enquiry page)
What is included in a rainscreen build-up?
A typical build-up includes cladding panels, a sub-frame system, insulation, a breather membrane and the structural wall.
Why is a ventilated cavity important?
It allows moisture to drain and evaporate, helping to protect the building structure and reduce condensation risk.
Do all rainscreen systems require insulation?
Insulation is typically included to meet thermal performance requirements, although specifications vary by project.
How is fire performance managed in rainscreen systems?
Through the correct specification and installation of cavity barriers and fire stopping systems.
Can FGF supply complete façade systems?
Yes. FGF supplies all key components required for rainscreen build-ups, supported by technical guidance.