The versatile and user-friendly subframe support system

The DuoLift™ joist support system was designed to make installation significantly easier and to ensure successful outcomes. Providing substantial height flexibility within four stackable components, DuoLift™ removes the common problem of having to order varying height pedestals for a single area. Height-adjustable from 15mm, DuoLift™ makes accurate height-setting easy, and is self-levelling from 35mm upwards.


DuoLift Joist Cradle 15-60mm

Providing an exceptional height range of 45mm, from 15-60mm, the DuoLift Joist Cradle enables precision height adjustment with 5mm markings on the side and each quarter turn of the adjustment ring representing a 1mm rise or fall. The Joist Cradle allows the installer to adjust the height whilst the joist is in place, locking tabs provide a secure finish once correct height has been determined.




DuoLift Self-Levelling Joint 20mm

Adding 20mm to the height of the supports, the DuoLift Self-levelling Joint provides easy and effective levelling of a subframe up to 5º, ready for decking installation. Suitable for standing directly onto a solid substrate, or for providing a joint for a higher support.




DuoLift Riser 45mm

The Riser component of the DuoLift system increases the height in increments of 45mm. It is capable of sitting directly onto a solid substrate under the Joist Cradle and Self-Levelling Joint or forming part of a higher stack with a foot beneath.





DuoLift Joist Foot 45mm

The DuoLift Foot provides a very stable footing for more elevated subframes, raising the height by 45mm and spreading the load further across the substrate, due to the 220mm base supporting a maximum combined height of 350mm.




DuoLift Acoustic Separation Pad 3mm

Agglomerated cork and recycled rubber pads offer a layer of protection between joist supports and membranes, as well as providing an acoustic benefit.





Simple stackability for height flexibility

Multiple height combinations from four sturdy components. With a selection of components on site, installation delays can be avoided.


DuoLift Height Chart






“An excellent solution. It’s stable, technically advanced and superior in every way.”

– Stephen McAllister, Approved Installer



Where to buy Millboard Decking?

Millboard has a range of distributors and approved installers across the UK – enter your postcode to find one near you. If you need any further help locating a supplier or installer, please get in touch.