Don’t worry, use the 5mm rubber shim in conjunction with cross spacers.
A good example of TD supports holding up the joist frame on a refurb decking project…
Check out our new case studies
Detailing a whole range of products https://www.wallbarn.com/projects-case-studies/
Green stop – Wallbarn M-Tray modular sedum green roof on a London bus stop
A good example of TD support pads holding decking joists
Wallbarn Protecto-board has ISO 14001 accreditation
Our factory has just been awarded the ISO 14001 certification for its effective environmental management system. Bituminous Protecto-board is manufactured in accordance with the ISO 14001 standard.
See here for more details on the product – https://www.wallbarn.com/products/roof-structural-protection/protecto-board-bituminous-membranes/