I'm building a low level deck over concrete with a slight slope. These builders edge pedestals will be just right for getting level joists, https://www.bunnings.com.au/builders-edge-35-60mm-smallfoot-pedestal-feet_p2450074 - I just need to know how many to use.
The joists will be 90x45 F7 H3 pine. Question is should I space them apart using span table measurements for 90x45 pine from AS1684 or do I need to get them closer together (i.e. use more)
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Welcome to the Bunnings Workshop community @Rob7. It's great to have you join us, and many thanks for your question on pedestal feet.
Span tables are exactly what you need to reference. As a ballpark figure, I'd suggest a foot every 900-1000mm would be adequate.
If spaced according to span tables, the feet will be more than capable of supporting the deck's weight.
Please let me know if you have any questions.