The easy to use kit to assemble your subframe

Since the launch of DuoSpan and DuoLift, Millboard has looked at how to make installation of our new subframe system as easy as possible. Therefore, we have developed DuoKit to give peace of mind that you have everything you need to assemble your subframe. DuoKit is designed to be used on residential applications due to the joist centres and spans. For commercial applications, you should follow the guidance in our DuoSpan and DuoLift installation guide.

DuoKit is designed to work with the width of our Enhanced Grain decking boards and all colours are available. You can order the boards as an additional purchase and they will be supplied in full lengths with the correct number of fixings needed to use in conjunction with DuoKit.

DuoKit is available for the following deck sizes:

  • 1.2m x 3.6m (KK1236), exact size with boards – 1200 x 3614mm
  • 1.8m x 3.6m (KK1836), exact size with boards – 1804 x 3600mm
  • 2.4m x 2.4m (KK2424), exact size with boards – 2347 x 2400mm
  • 3.6m x 3.6m (KK3636), exact size with boards – 3614 x 3600mm
  • 3.6m x 5.4m (KK5436), exact size with boards – 3614 x 5400mm

For larger sized decks, two kits can be put together.

DuoKit contains the following items:

  • DuoSpan 51mm Joists
  • DuoSpan Joist Inserts
  • DuoSpan 51 90° Angle Brackets (boxes of 10)

DuoKit layout for 1.2m x 3.6m:

DuoKit layout for 1.8m x 3.6m, 2.4m x 2.4m, 3.6m x 3.6m and 3.6m x 5.4m:

Available add-ons to work with DuoKit:

  • DuoLift
  • Millboard Enhanced Grain decking
  • Edging and Fascia
Slip Resistant

Slip resistant

Does Not Rot or Warp

Does not rot or warp like wood

Lost Head Fixing

'Lost head’ fixing

Low Maintenance

Low maintenance

Stain Resistant

Stain resistant

Resistant to Algae

Resistant to algae

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.