Tassie Oak uneven reddish blemishes

We are not familiar with the problem you describe. It should be possible to sand Tas oak (even 'aggressively') without causing colour change. Tas oak normally varies in colour from straw, to pink, to reddish brown as illustrated here https://thetimberline.com.au/pages/tasmanian-oak. The timber in your image looks very dark so perhaps sanding it has generated enough heat to darken the wood. We can't suggest a remedy, other than turning the treads over, so the darkened wood is on the underside. Sorry we can't be more help.

Timber Brick Wall detail

We only have a limited number of certified construction details, and these form the basis of our Technical Design Guides. For reasons of legal liability we limit our advice to these details, rather than becoming involved in specific projects. We suggest you consult a Building Certifier or fire engineer, who will be able to give you formal building approval. Contact details for fire engineers can be found on various websites.

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