Pavers on pedestals over a membrane: bearing, protection and getting back in to repair
The city-hall paving crew has set out its first pedestals. The supplier’s drawing includes a bearing component that is absent from the delivery. The superintendent is asked whether a spare piece of board under each support would be good enough.
Resolve the support and waterproofing interface as part of the complete paver assembly. The cited pedestal guide has distinct bearing, layout, edge and maintenance provisions for its selected products. A pedestal’s rated capacity alone does not establish the receiving roof assembly’s suitability. Confirm the actual protection and bearing arrangement rather than substituting a convenient pad beneath every support.
Confirm the receiving assembly before repetition
- Identify the selected layout. Retain the approved paver, pedestal and substrate references with zone boundaries, heights, drains and thresholds. Have the responsible designer and supplier resolve special conditions. Do not extend one ordinary support detail to cut pieces, high supports or a different edge without confirmation.
- Obtain bearing and protection decisions. Bring the actual layer build-up, support loads and proposed components to the responsible technical assessment. Confirm membrane compatibility and required load distribution. Keep the selected component identity visible; a spare board or copied pad size is not an engineered substitute.
- Coordinate edges and interfaces. Confirm the applicable restraint, gaps, drain access, changes in height and movement-joint arrangement. Assign each receiving condition to a trade. An apparently level finished surface does not prove its perimeter or concealed interfaces are complete.
- Review a representative area. Locate the agreed trial and retain the required checks before the crew repeats it. Record the components, receiving surfaces and relevant exceptions. If a delivery omits an approved part, resolve that gap instead of installing the trial on a different assumption.
- Plan later access through the actual system. Have the supplier and owner team confirm which areas and components may be opened, by whom and with what approved handling arrangement. Mark service locations and restrictions. Do not promise that a paver can always be lifted freely where restraint or other attachments apply.
- Retain the installed and care record. Keep the accepted layout, changes, review evidence and maintenance instructions with the owner’s files. Identify spare components where required and the technical contact for instability or damage. A maintenance photograph should retain its location rather than becoming another unlabelled image.
Common mistakes
- Treating the pedestal rating as approval of the roof build-up.
- Replacing a missing bearing component from convenience.
- Promising unrestricted paver removal without checking the selected system.
Checklist
The support and access package
- Selected paver and support references.
- Qualified bearing and protection decisions.
- Resolved edges, drains and joint interfaces.
- Located first-bay review.
- Confirmed owner access and handling information.
- Installed layout and maintenance history.
Check your understanding
The support has adequate stated capacity, but its receiving insulation and membrane arrangement remain unassessed. Can the first bay proceed on that rating alone?
