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LANDSCAPING & EXTERNAL WORKS
Expect pedestal weight tolerances of up to two tonnes and height ranges from 26 mm to 675 mm via threaded stems. Good Class A pedestal systems will be compatible with a range of height-adjustable profiled aluminium joists and rails to form a strong substructure frame to create Class A decking or terrace.
The retrospective ban on combustible materials in the external walls of high rise buildings above 18 metres (11 metres in Scotland) has compelled building owners to remove such materials from at-height balconies and replace them with Class A non-combustible products in order to certify buildings safe via the EWS1 Form. For these projects consider speaking with a supplier who can assist in creating a pedestal layout, as it can be difficult to ascertain exactly what lies beneath a wooden or PVC deck until strip-out begins. Having a supply partner that’s able to quickly and accurately estimate and lay out the height and position of pedestals is extremely useful to specifiers.
Usage Will the newly-created or refurbished space be open to the public, subject to high footfall, vehicular movements, and will it be supporting heavy furniture, planters etc? Understanding the usage is important to ensuring that the pedestal system can withstand the required weight tolerance long-term.
Failures can happen when an unsuitable product is installed. We were called in following the partial collapse of raised paving on a public roof area. Lifting slabs around the affected area revealed that the architect’s specification for quality pedestals with independent laboratory certification had been disregarded in favour of a cheaper alternative – injection moulded plastic pedestals with a large proportion
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of chemical fillers. The pedestals became brittle in cold temperatures and shattered. The original specification was not met, therefore the contractor was held liable for the claim.
What to look for? For standard plastic pedestals, a weight tolerance of 680 kg and temperature tolerance of -40°C to +75°C is more than achievable. Heavy duty plastic pedestals can offer a weight tolerance of over 1.5 tonnes each with a breaking point of two tonnes. Standard metal pedestals can withstand two tonnes.
Both plastic and metal pedestals are available in self-balancing systems, allowing installers to deliver super flat finishes even when deck surfaces are uneven (for example felt overlaps, blemishes, ridges etc) or when paving slab thickness varies.
Leading pedestal systems include all this plus self-levelling headpieces, positioning lugs, the ability to change pedestal height post-installation and a variety of heights (from 10 mm to 1 metre plus) to accommodate changes in deck heights, thresholds etc and work around deck obstructions. The substructure system of a platform of aluminium rails fitted to adjustable pedestals, then the tiles or decking fixed to them creates a laterally stable and ultra hard-wearing raft, improving the performance of the paving or decking system and allowing a greater degree of finishing and furnishing options as well as being able to accommodate more foot traffic.
Suppliers who offer a full and compatible substructure (a rail system connected to pedestals for tiles and decking) means that clients know all the individual elements connect effectively and they can source the entire system – pedestals, substructure and tiles/paving/decking – from one source.
Julian Thurbin is director of Wallbarn ADF JUNE 2024
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