The next generation in timber sub-frames. A solution for rooftops, balconies, waterproof membranes & low height decks.

Introducing LOWDECK - a new range of engineered timber bearers and joists specially designed for use in low height decking.

Treated to H4 Hazard rating making it suitable for ground contact use, LOWDECK uses Koppers Micro® Timber Treatment Technology, to protect from fungal decay, termites & insect attack and supported by a treatment warranty of 50 years. Engineered GL8 structural grade strength (roughly F7 equivalent) and double sealed with a high-quality oil-based primer to provide further protection.

LOWDECK is an affordable, easy to work with alternative to steel or aluminium. It’s the perfect match for Millboard - which unlike other decking products requires no minimum clearance or ventilation.

LOWDECK is also a smart upgrade from regular H3 Treated pine joists for better building projects. For ultra-low decks installed over concrete slabs or waterproof membranes, plastic packers or Millboard’s range of Joist Cradles and Self-Leveling Pedestals can be used to level out the deck and bring the joists or bearers off the ground, allowing for drainage & improved service life.

Why is LOWDECK needed?

Regular H3 Treated pine bearers and joists are bread and butter for deck sub-structures - But the H3 Hazard Rating is intended for above ground use only and assumes sufficient clearance and design to allow for ventilation. This is to minimise the risk of the frame rotting out and the decking above it cupping and warping etc. Below 400mm height issues with ventilation and moisture can impact the service life and appearance of the deck. Lower again under 150mm H3 timber should not be used.

“Framing timbers on the ground or lower than 150 mm should be termite resistant and in-ground durability Class 1 or treated to H4 or better.”

(Source: Technical Design Guide - FWPA - Domestic Timber Deck Design)

It’s becoming more common for finished height thresholds to be very low - with many outdoor patio and slab areas on new builds, concrete balconys and rooftops leaving little height for the decking & substructure. For these areas LOWDECK provides the solution.


We'll make your dream deck a reality.

Call us on
0414 382 411
for info or an on-site consultation.

Or send us a message.