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Timber decking sub-frames need to be carefully installed, taking into account the irregularities of timber as a natural material. And with the increasingly frequent issue of depth restrictions in decking installations, timber bearer sizes are being reduced to enable the decking surface to be low enough, causing ‘bouncy’ walking surfaces with the additional risk of the timber bearers breaking under stress.
With its vastly superior strength:depth ratio, aluminium substructures can allow a support height as low as 25mm whilst still adhering to the stringent industry loading criteria of 4kN/m² - RynoDeckSupport DS22 Aluminium Low Height Decking Joist Datasheet
Aluminium will not bow between supports/pedestals. And when using a robust, high-quality joist such as the RynoDeckSupport DS72 72mm high Aluminium Joist, the decking supports can be spaced over a metre apart.
Pair this with plastic deck supports and you have a strong, robust deck sub-frame that is tried, tested and confirmed to withstand weight.
Large timber structures, such as decking and its substructure, pose a considerable fire risk. Which is a particularly sizable consideration on the balconies and terraces of high-rise buildings. But it doesn't need to be with aluminium: a non-combustible material that won’t burn.