It is surprising that reclaimed timber is not offered in a stress graded condition. Grading rules for recycled timber are available on our website and can be downloaded free of charge via this link https://www.woodsolutions.com.au/system/files/Recycled_Products_Structuralproducts_0.pdf. Span tables can also be downloaded once the grade is known. It will be necessary to know the species of timber before it can be graded, but presumably suppliers can provide this information.

Whether timber would achieve a 1-hour fire rating depends on the size and density of the species of timber. Our Technical Design Guide #06, titled Timber-Framed Construction – Sacrificial Timber Construction Joint, explains how to use timber's charring properties.

Depending on the type of hardwood, H3 treatment might not be needed. A marine environment is not particularly hazardous for dense hardwoods, but care is needed in specifying fasteners since a salty atmosphere is highly corrosive to metals. Durability Class 1 hardwoods such as ironbark, spotted gum, blackbutt etc. would achieve a probable life of up to 40 years out of ground contact according to Australian Standard 5604:2022, Timber - Natural durability ratings. In fact the heartwood of such species is difficult to treat effectively.