Product Knowledge

Roof Podium Build-up Type

Roof Podium Build-up Introduction 

Podium spaces and roof gardens are becoming increasingly popular thanks to their positive impact on the environment and benefits to building users.  Technically anything is possible on roof gardens with the quality of green roof infrastructure being designed and manufactured by companies in the industry.   

However, podium and roof garden spaces remain especially challenging to design and build due the number of demands placed on the build-up.  For example, the build-up needs to be waterproof yet have provision for rainwater runoff.  It must be lightweight yet strong.  It needs to be aesthetically pleasing in what otherwise would be an ugly area of exposed concrete and steel. 

How to approach build-up design 

The best way to approach a roof build-up design is to work from downwards.  That is, establish what will be placed on the build-up such as planters, seating or even water features and then work out what will be needed to support this. 

Many roof gardens will incorporate planter areas and paving areas as the primary components.  With regards to the build-up, the obvious next step is the establish where these areas will be.  The build-up beneath a planter is substantially different from the build-up beneath the paving. 

A good approach is always to consult with the individual component manufacturers closely during design.  There are companies who offer the full build-up including pedestals and planter edge systems, but this approach often struggles when it comes to option choice.  Due to the variety of needs at roof level, each component needs its own specialist manufacturer to provide the necessary range of options, something that is very difficult to be achieved by a full build-up company. 

Planter Roof Podium Build-up 

For planter areas, we recommend the following build-up when using Logic’s Velox Rapid Edge Planter System: 

1, On top of the concrete slab/insulation, place Bauder DSE 40 Drainage Board or similar  

2, Where the planter steel edge will sit, fill the drainage crate with Bauder Mineral Drain for additional strength 

3, Place a Bauder Filter Fleece mat on top of all areas of the drainage board 

3, The planter can be placed directly on top of the filter fleece. 

The filter fleece is a filtration layer that prevents substrates from washing into the drainage layer. 

Paving Roof Podium Build-up 

There are 2 approaches for the paving area build-up. 

Approach 1 – Drainage Crate Method 

1, On top of the concrete slab/insulation, place Bauder DSE 40 Drainage Board or similar  

2, Infill the drainage board with Bauder Mineral Drain 

3, Place a 20mm layer of sand on top of the drainage board, and the paving on top of the sand 

Approach 2 – Pedestal Method 

1, Use a Ryno pedestal system or similar in lieu of the drainage board, mineral drain, filter fleece and sand layer 

Conclusion 

Approach 1, or the Drainage Crate method will always be more cost effective than pedestals.  However, for certain applications drainage crate is not suitable for paved areas, for example on an uneven roof surface.  Therefore, a pedestal system would be more suitable. 

It is possible for a pedestal system to support a planter, however in most cases it is not suitable due to the increased cost and weight. 

https://www.nhbc.co.uk/binaries/content/assets/nhbc/tech-guidance/basement-guidance-note-no-2—podium-decks.pdf

https://www.bauder.co.uk/technical-centre/downloads/system-brochures/green-roof-systems.pdf

Logic Manufactured Bespoke, Telford Rd, Middlesbrough, TS3 8BL

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