This was an old deck in Kloof that we refurbished recently. It had balau deck boards on top of a balau structure. Of the 11 joists that made up the structure only 2 were still in a fair condition. The rest had rotted and we needed to replace them. Please see this article on the pros and cons of using balau as a structure. https://blog.thewoodjoint.co.za/2015/06/21/balau-vs-cca-treated-substructure-in-your-wooden-deck-durban-and-cape-town/
The deck was fairly old (20 years plus). 20 years ago most deck builders used balau as a structure. Over time they have come to realise that a chemically treated pine structure will out last a balau structure because it is chemically treated and therefore it’s behaviour is known. The process of pressure treating is safe and arguably does no more damage to the environment than cutting the purpose grown tree down in the first place.
We ended up lifting all these deck boards, numbering them and replacing them in their same position so that we could use the same screw holes. Rather than sliding new joists in below the deck boards.
The deck boards themselves where quite mottled with black algae but the wood itself was still ok so we pressure cleaned the deck and then oiled it with a penetrating oil. In some pics you can see the difference between coats of oil. The balustrade is all new as the old balustrade had rotted away beyond repair and had been removed by the client.
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