Author: FGF Technical
A rainscreen sub-frame system forms the structural framework that supports external cladding panels on modern ventilated façades. Although largely hidden once construction is complete, the sub-frame is one of the most important elements of a rainscreen façade, transferring loads safely back to the building while creating the ventilation cavity that allows the façade to perform effectively.
Typically comprising adjustable brackets, aluminium rails and specialist fixings, sub-frame systems are used across commercial, residential, healthcare and education projects throughout the UK.
Selecting the correct support system is essential for structural performance, thermal efficiency and the long-term durability of the façade.
A rainscreen sub-frame is the structural support system fixed to the primary structure of a building before external cladding panels are installed.
It creates a stable framework that:
Once installed, the rainscreen panels are fixed to the sub-frame, creating the completed façade system.
Although systems vary between manufacturers, most rainscreen support systems comprise several key components.
Adjustable brackets fixed back to the building structure, providing support for the aluminium rail system while accommodating varying cavity depths.
Vertical or horizontal rails fixed to the brackets to create the structural framework supporting the façade panels.
Many systems incorporate thermal isolators or thermal break pads to help reduce heat transfer through the support brackets.
Specialist fixings secure the brackets and rails to the building structure while maintaining the structural performance of the façade.
The sub-frame does much more than simply support cladding panels.
Correctly designed systems help:
Because every building is different, support systems are typically designed specifically for each project.
Sub-frame systems are widely specified across many sectors, including:
They are compatible with a wide range of cladding materials, including fibre cement, HPL, aluminium composite, terracotta, porcelain and metal panels.
Several factors influence the design of a rainscreen support system.
These include:
Structural calculations should always be carried out in accordance with the manufacturer's design guidance and project requirements.
FGF supplies rainscreen support systems from leading manufacturers together with technical guidance for projects throughout the UK.
Our expertise includes:
Working closely with manufacturers and façade contractors, FGF helps ensure the correct support system is specified for every project.
Whether you're designing a new rainscreen façade or specifying support systems for a refurbishment project, FGF can provide technical guidance and nationwide supply.
Contact our team to discuss your project requirements.