Roof Decking Pavers

Topic Summary

Decking materials for roofs consist of concrete pavers and roof paving slabs.  Concrete pavers are most commonly used in pedestrian and vehicular applications.  Pavers can take on various shapes but do not exceed a 4:1 length to thickness ratio.  The thickness of concrete pavers ranges from 1 1/2" for areas where the weight of the pavers is critical to 3 1/8" for areas with vehicular use.  Roof decks of below grade buildings, for example, use concrete pavers to support vehicular traffic.

Roof paving slabs, on the other hand, can range in size from 10" x 10"  to 36" x 36".  Their thickness typically ranges from 1 1/2" to 2", and they are intended for pedestrian applications only.  As the name implies, roof paving slabs are concrete based which makes them ideal for use as roof ballast.  When roof paving slabs are larger than 12" x 12", they should be installed on pedestals with a 1/8" gap between each slab to allow for drainage.  Roof paving slabs can also be set in sand over a drainage mat and mortar setting bed.  As with any modification to a roofing system, it is critical to verify with the roofing manufacturer the compatibility between roofing pavers and supports and the roofing system, in order to maintain all warranties; it is also necessary to verify with the structural engineer that the supporting structure can handle the added load.

Advantages of Pedestal-Set Paving Units

• Provides a level surface
• Conceals the roof slope and roof drains
• Quick installation
• Removal of paving units allows access to waterproofing system and roof drains
• Provides a space to conceal electrical conduit and mechanical piping
• Provides protection to the roof waterproofing system from deterioration, foot traffic, equipment, and environmental stresses

Images | Diagrams

Videos

Whitepapers