Unfortunately there are no CAD files for our Technical Design Guide #46. The worked examples are “general conceptual designs” as explained in the Introduction, and are provided to show how to calculate using various design inputs, rather than for use in real life scenarios where actual design drawings would be needed.

It's very difficult to say exactly how long it would take for your floor bearer to lose half its cross-section to wood rot. Although the bearer is hardwood, different types of hardwood have different levels of resistance to fungal decay. Some species are more resistant than others. We can say it would take more than days or weeks, and at least some months, possibly up to a year. Wood rot progresses more slowly when wood is wet intermittently in the open air, as opposed to wetting from a constant source of moisture in an enclosed situation, as in your sub-floor space.

WoodSolutions has not commissioned fire tests specifically on CLT but it's possible some of our reports could provide relevant data, depending on which fire properties you need, eg. Critical Radiant Flux, Group Number etc. Otherwise some Australian CLT producers have produced fire data, for example XLam here: https://xlam.co/wp-content/uploads/2024/10/004-XLam-Fire-Design-Guide-V2-August-2023.pdf.

We would be cautious about gluing timber decking to a steel PFC channel. Timber needs to be able to respond to changes in moisture content, as are likely in external decking, by moving slightly ie. swelling on taking up moisture and shrinking on drying. Any fixing system that restrains this movement is likely to lead to splitting of the timber. Perhaps an adhesive company can advise you of a product that allows such movement to take place. Major adhesive companies provide technical support for their products and you will find contact details on company websites.

The only OSB supplier we know of in WA is Bunnings. Their website shows that they stock a range of OSB products, perhaps not in every store but if not immediately available they should be able to order it in for you. Bunnings supply to Trade customers as well as retail.

The diagrams in Appendix A of our Technical Design Guide 37R are not tested systems, nor extracts from the BCA. They are test procedures to establish Resistance to the Incipient Spread of Fire (RISF), that is, they are to assist in setting up the tests.