Product Knowledge

Raised planter edging on roof falls, how does it work?

With the increased desire for intensive green roofs on high-rise buildings, this has seen an explosion of creative green areas with some very clever designs and furniture.

Due to the need of water drainage on roof tops, many concrete roof slabs are laid to fall with anything from 1:80 to 1:40. Anything below 10 degrees is classed as a ‘flat roof’ even if not literally. BS6229 has recommendations on this very subject.

Also, as the function of the floors below sometime takes precedence over the roof space above, there is often multi-levels and stepped areas in the structural slab.

Many of theses areas would have paving and/or decking which can be installed on pedestals and rail systems, which are designed to take up the various levels, and works well. The end result is achieved, that of a level area. But what if we need planting areas for trees, shrubs, etc where you have the bulk and weight of soil? Lifting these areas to deck level means less depth of soil, so reducing your options of planting, and the issue of point loading raises its head? Can we successfully have raised planter edging on these challenging roof tops?

The simple answer is, yes we can. The Velox Rapid Edge system is perfectly suited to this.

Option 1

This option shows suitable aggregate infill, laid to take up the variations in the structural slab providing a level plain. This is a simple yet clever method of dealing with falls whilst reducing fire risk and spread through limiting the size of the void between paving and substrate. Type of aggregate is project specific.

Aggregate infill is a simple yet clever method of dealing with falls whilst reducing fire risk and spread through limiting the size of the void between paving and substrate.

Option 2

This is where the Velox system takes up the variations in the structural slab whilst maintaining a top edge parallel to FFL. Whilst this option offers a simplified on site process, additional time is required during the design process.

Conclusion

As we know, not all roof slabs are design and constructed as a single plane; where required BS6229 has recommendations for structural slabs to be laid to a fall. Also, roof / podium slab can often have multi-levels due to requirements on the level below.

However, does this system work in these areas? Yes, due the flexibility of the system,

Velox Rapid Edge™ is perfectly at home in most circumstances. If you have a question please give us a call and speak to the specification team 01642 373400 or email specification@logic-bespoke.com

Logic Manufactured Bespoke, Pennine House, Hurricane Court, Stockton-on-Tees, TS18 3TL

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