Sub-frame
With a choice of standard galvanised steel sub-frame, designed for caravans and lodges, or low aluminium sub-frame designed for garden or domestic use, Liniar has a maintenance-free sub-frame to suit every decking project.
From the ground up
An absolute must for any decking system is for it to be strong, robust and safe – and Liniar’s choice of galvanised steel or aluminium sub-frames create the ideal maintenance-free base on which to build your
durable and secure
The Liniar sub-frame has been successfully load tested to 500kg/m². Even treated timber, sitting in wet conditions, will soak up moisture from the ground beneath it, as well as from the deck itself. Because they’re hidden underneath deckboards, timber sub-frames are unable to dry out naturally and will instead ‘sweat’ – a process that will increase the rate at which the timber rots. As Liniar sub-frames don’t absorb moisture and won’t rust, you can rest assured your deck will be safe and secure for many years to come.
Galvanised steel sub-frame
Liniar's original galvanised steel sub-frame is 150mm high and designed for use in elevated applications including holiday home decking such as around static caravans.
It consists of just two components – a galvanised steel ‘i’ beam and its connector. The sub-frame is connected into a grid pattern and the deckboards are fitted directly to the joists, meaning any deck built on our steel sub-frame may be extended, moved or repositioned with minimal risk of damage or disruption – unlike timber foundations, which are much more difficult to move.
Aluminium sub-frame (low)
Designed specifically for stand-alone decking projects such as gardens, play areas and more, Liniar’s aluminium sub-frame offers a versatile, maintenance-free alternative to traditional timber sub-frames.
When fixed together in portrait (low) orientation, it provides a 50mm high sub-frame that can be raised or lowered with adjustable feet (not supplied by Liniar).
Aluminium sub-frame (ultra-low)
The versatility of Liniar's aluminium sub-frame is such that when it's fixed together in landscape orientation, it is just 25mm high. This means it can be used in most stand-alone decking areas, so it's perfect for garden decking areas.
All sub-frame heights can be raised or lowered using adjustable feet (not supplied by Liniar) to reach the required level for your decking installation.
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Sub-frame FAQs
What is a sub-frame?
A decking sub-frame is the supporting structure under a deck that provides stability, strength, and drainage. It includes beams, joists, and posts to distribute weight and prevent sagging. This subframe is essential for the deck's overall strength, safety, and capacity to handle expected loads.
Is a sub-frame necessary for my deck?
A fundamental requirement for every decking system is its strength, durability, and safety, so a sub-frame is essential to make sure it is level and safe. Liniar offers a selection of galvanised steel or aluminium sub-frames, which serve as the perfect hassle-free foundation for constructing your uPVC composite deck.
Is there a sub-frame that would work well for my garden project?
Certainly! We suggest considering an aluminium sub-frame for your garden decking project, thanks to its low profile - it can be used for any height of sub-frame from 25mm (ultra low) to 50mm and higher using adjustable feet (not supplied by Liniar).
Is there a sub-frame available that suits my holiday home project?
Vital for any caravan decking system are a sub-frame's strength, durability, and safety. Liniar's galvanised steel sub-frame offers the perfect maintenance-free foundation for the deck that spans around your static caravan or holiday lodge. It has been used on holiday parks across the UK since 1994, giving you the peace of mind that it's built to last!
Do Liniar decking kits include the sub-frame?
When purchasing a Liniar decking kit through an approved stockist, adding a galvanised steel or aluminium sub-frame is an optional extra - please liaise with your Liniar supplier about the sub-frames they offer and install.
Liniar designs and tests products, extrudes the PVCu profiles and delivers them to independent specialist manufacturers and resellers all over the UK. You can find your nearest with a simple postcode search.
It’s easy to get in touch with Liniar. Fill in a quick form and your enquiry will be directed to the correct department. Note our office hours are Monday-Friday, 8:30am to 5pm and we endeavour to respond within 24 hours.
The galvanised steel sub-frame was improved a few years ago with a time-saving nogging, saving installers up to 3 hours' time when fitting a caravan deck!
Product information
- Unlike timber, metal won't rot, ensuring the longevity of your deck
- Steel and aluminium sub-frames comply with fire safety regulations
- Easily connects together in a grid pattern, using two components
- Load-tested - will easily take the weight of a mobility scooter
- Ensures a fully timber-free installation - safe for many years to come
- Galvanised steel sub-frame height = 150mm
- Aluminium sub-frame height - either 50mm or 25mm
- Use with height-adjustable pedestals to ensure a level decking installation
- Can be extended, moved or repositioned with minimal risk of damage
- Suitable for use with both types of Liniar deckboard and/or balustrade