PX Cavity Rail System
The Rear-ventilated Rain Screen facade
PX40, PX20 & PXR are a ventilated rainscreen cladding with a cavity rail system for fibre cement or HPL cladding panels. It allows for panels to be mounted and provides an expressed joint finish. All systems offer a combination of visual appeal and practicality, making it a suitable choice for contemporary buildings seeking effective cladding solutions.
The PX system incorporates an anodised aluminium rail support system to achieve a certain cavity depth, either 20mm or 40mm. This cavity allows for ventilation and drainage, preventing moisture buildup and improving the overall thermal performance of the building. The system is specially designed for a quick and easy install on standard NZS 3604 timber framing.
Functional and Aesthetic
Cladding panels are attached to the support rails with the concealed adhesive fixing system, creating a clean and high aesthetic finish. Select from prefinished panels offered in a large range of colours and surface textures, only requiring low maintenance, or a plain panel ready for the site applied paint finish of your choice. The system offers architects design flexibility and freedom, as the panels can be customized in terms of size, layout, colour and finish, creating unique facades for the specific project.
The system can be used anywhere in New Zealand including coastal locations and up to extreme wind pressures. Making it suitable for a vast range of building types; residential, education and commercial buildings.
Overall, the rainscreen system provides a cost effective, durable and visually appealing solution for cladding buildings, offering both functional and aesthetic advantages.
Features & Benefits
Rain-screen Cladding with natural bottom to top ventilation
Suitable for buildings over 10m, in conjunction with a PS1
Complies with C/AS2 5.8 External Wall Cladding
Adhesive fixed Cladding have no LRV colour restrictions
Maintenance free when used with a Prefinished Cladding Panel
Easy to Install
Designed to install on standard NZS 3604 timber framing
No double framing required at vertical expressed joints
Anodized Aluminium support rails and components provide 50 year service life
15 year system warranty
PX Support System Options
There are 3 PX Cavity Rail Support System options; PX40, PX20 & PXR.
The options vary slightly in cavity depth, drainage, ventilation and adhesive application.
For guidance on which option to use, a clear comparison of the options can be seen below.
Although there are 3 options, the finished façade looks the same for all 3.
The PX substructure can then match with 3 different cladding products.
See further below for panel options.
40mm Cavity Depth
Drained and
Bottom to Top Ventilated
Suitable for buildings at any height
Recommend for Commercial or
any projects requiring a deeper cavity depth
May require site-specific PS1
due to building height
standard 20mm cavity
Unrestricted Building Height
May require site-specific PS1
Flexible horizontal joints without
extra framing
Easy and Quick Install
Mainly Vertical rails
20mm Cavity Depth
Drained and
Bottom to Top Ventilated
Suitable for buildings up to 25m
Recommend for Residential,
Light Commercial Buildings &
Ministry of Education (MoE) projects
May require site-specific PS1
due to building height
Pros & Considerations
standard 20mm cavity
Suitable for up to 25m
May require site-specific PS1
Flexible horizontal joints without
extra framing
Easy and Quick Install
Mainly Vertical rails
20mm Cavity Depth
Drained at every
Horizontal Joint
Suitable for buildings below 10m
Recommend for Residential,
Light Commercial Buildings
BRANZ Appraisal No. 1252
Limited to bulding height below 10m
standard 20mm cavity
Restricted to 10m
Compliance with BRANZ Appraisal
More components and framing for horizontal rails required
Longer install time compared to other 2 systems - requires horizontal rails and small components
