Floorspan hollowcore concrete planks are suitable for use in both masonry and steel frame buildings.
The minimum bearings requirements for hollowcore planks onto masonry walls is 100mm.
The minimum bearing requirements for planks into/onto steelwork is 75mm.
Planks can bear on to the supporting structure at the front or side so robust detail requirements can be met.
One of the most common applications of a slab is to bear onto a 100mm wide wall, as pictured.
When your floor layout is designed, we can make provisions for service voids, cut-outs and notching to suit the building envelope.
Where large openings are required, we can provide bespoke steel trimmers which trim out the opening and maintain structural integrity.
These are clearly marked on the design drawing we provide.
If the structure is masonry, there is often a requirement for slabs to share a wall.
In this situation, the wall is normally 190-200mm wide. A 140mm wide bearing wall can be accommodated with special measures. Please discuss with one of our experienced designers.
When side bearing is required, the gap between the underside of the plank and the top of the blockwork wall, should be filled with mortar before building above the planks.
This helps with air tightness and reduces the transmission of sound.
A bearing of 75mm in to or on to a steel support is preferable. Less bearing can be accommodated in specific situations.
When bearing into shelf angles, the ends of the planks can be chamfered to aid installation.
The void between the chamfered plank and steel should then be filled with concrete by the main contractor to create a solid floor.
Where the planks are spanning parallel with a steel beam, the void between the plank and the steel should be filled with concrete.
Doing this means that optimal sound separation and fire safety is achieved.
Floorspan can provide open cores and other specialist features if required, to meet any disproportionate collapse requirements set out by the project engineer.
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