Stair treads are constructed using an open steel grating from the flooring range with a nosing bar / sight bar welded to the front edge and drilled end plates to allow for bolting to stair stringers.
Lionweld Kennedy stair treads have been designed to help our customer comply with BS4592-0:2006+A1:2012, utilising our safegrid LK 35mm BP grating and LK 20mm BP gratings.
Mesh Size Requirements
Where metal treads or landings are used for fire escapes, the gratings shall not allow passage 20mm diameter ball.
The minimum stair clear width shall be 1000mm unless supplied for hospitals which shall have a minimum clear width of 1200mm.
The British Standard advises a minimum going of 250mm plus a 16mm overlap which means the minimum tread width should be 266mm. The below table gives Lionweld Kennedy standard stair tread widths for each tread type.
|Nominal Standard Tread Widths|
|LK 20mm BP - 3mm Bars||277mm||306mm|
|LK 20mm BP - 5mm Bars||277mm||306mm|
|LK 35mm BP - 3mm Bars||-||306mm|
|LK 35mm BP - 5mm Bars||277mm||306mm|
|LK Utility Grating - 3 & 5mm Bars||277mm||-|
|* Do not Comply with BS4592 but do comply with BS EN ISO 14122|
|**Other sizes available on request|
Tread nosing is a vital component of a stair tread because it provides multiple characteristics to the tread. These include: –
Lionweld Kennedy offer three nosing types
The below table gives a selection of treads and the maximum tread length. Loading criteria is available for other tread sizes by contacting our technical team on 01642 233297 or email email@example.com.
|Maximum Tread Length|
|Grating Type||Bar size||Nosing Type||Max Tread Length|
|LK 20mm BP||25x3||Liongrip||1200mm|
|LK 20mm BP||25x5||Liongrip||1200mm|
|LK 20mm BP||40x5||Liongrip||1505mm|
|LK 20mm BP||25x3||Durbar||825mm|
|LK 20mm BP||25x5||Durbar||955mm|
|LK 20mm BP||40x5||Durbar||1400mm|
|LK 20mm BP||25x3||Yellow Gritted||1200mm|
|LK 20mm BP||25x5||Yellow Gritted||1210mm|
|LK 20mm BP||40x5||Yellow Gritted||1545mm|
|LK 35mm BP||25x3||Liongrip||1200mm|
|LK 35mm BP||25x5||Liongrip||1200mm|
|LK 35mm BP||40x5||Liongrip||1295mm|
|LK 35mm BP||25x3||Durbar||620mm|
|LK 35mm BP||25x5||Durbar||770mm|
|LK 35mm BP||40x5||Durbar||1200mm|
|LK 35mm BP||25x3||Yellow Gritted||1200mm|
|LK 35mm BP||25x5||Yellow Gritted||1200mm|
|LK 35mm BP||40x5||yellow Gritted||1335mm|
Stairtreads are fitted with drilled end plates to allow them to be bolted to the supporting stringer. The drilled hole positions have been standardised across the whole range of treads, however alternative drillings are available on request.
The end plate drilling consists of one fixed and one slotted hole to allow flexibility during installation. The below sketch shows the standard end plate details.
Following the government mandate on BIM level 2 requirements throughout the supply chain for all government funded projects, Lionweld Kennedy have built on our existing processes to become fully BIM level 2 compliant. Our internal processes are aligned with the requirements of PAS1192-2:2013 to ensure full BIM compliance and ensure we are prepared for fully collaborative working practices in line with specific client requirements. Using our primary BIM authoring software Tekla Structures, which is aligned to our in house manufacturing processes we have developed our comprehensive BIM object library available for download.