Pedestals for Wood Decks

How to build a traditional wood plank deck over pedestal supported wood bearers

Pedestal systems enable you to construct a traditional wood plank deck with less work and lower cost on rooftops, plazas, terraces and garage roofs. No expensive or complex substructure of steel beams or other crisscrossing bearers is required. Adjustable height pedestals are simply placed at defined intervals across the surface and wood bearers are screwed to the heads of the pedestals. Then the wood planks are attached to the bearers in the traditional manner using screws, nails or clips.

The broad based, stable, adjustable decking joist supports avoid damaging waterproof membranes, permit easy accessibility for maintenance or repairs to the membrane and concealed services below, allow air to circulate freely under the deck and water to flow easily to drains.

The special heads on the joist support pedestals can accommodate practically any type of wood joist whilst the self-leveling heads can compensate for sloping surfaces up to 5% in any direction.


Constructing a wood deck with the Eterno pedestal system saves a significant amount of time and materials compared with building a traditional substructure.

Firstly place a row of pedestals  along the outer edge of one side of the deck area, typically at 24″ intervals.  Adjust the height of each pedestal by screwing the central column up or down to the approx. height required.  Place a wood bearer on the pedestal heads and secure it in place at both ends by inserting screws through the vertical face of the pedestal head and into the bearer.

Check for level and adjust the height of the other pedestals along the bearer by screwing the pedestal base clockwise or anticlockwise (a head lock prevents the central column from rotating).  When all the heads are positioned firmly under the bearer, insert screws to secure the remaining pedestal heads to the bearers.

Place a second row of pedestals parallel to the first, separated at a distance governed by the wood species and thickness of planks being used and any relevant codes.  Attach bearers to the pedestals as described in the step above.

Lay a wood beam across the two rows of pedestals and check for level.

Proceed in a similar manner across the deck area ensuring that the final row of pedestals on the opposite side is laid as close to the wall as possible.

Attach your wood planks to the bearers using your preferred fixing method – screws, nails or clips.

See the video below for further guidance in constructing a traditional wood plank deck with the Eterno decking joist support pedestals. system.