How to replace rotted treated Pine retaining wall?

[DaveR24]

Hi all, my first post.

I built a 3 tiered retaining wall in 2018 with the brown/ red coloured ( ? ACQ ) treated pine sleepers for a native garden. Still looks great but just today I noticed that some of the posts and sleepers are suffering severe fungal rot. 
How can this be after only 7 years? All of the timbers were purchased from Bunnings and I was assured they were suitable for inground use, equivalent to H4.

I’ll probably need to dig out and replace ( with ? Gal posts) those posts worst affected and maybe treat other sections with anti fungal chemicals. 
My questions are 1. Has anyone else seen this level of fungal rot so soon with any type of treated pine? 2. If I use Gal posts , they will look out of place. Any suggestions re alternatives? 3. Is Bunnings willing to supply materials FOC to enable repair?

 

[EricL]

Hello @DaveR24 

Welcome to the Bunnings Workshop community. It's wonderful to have you join us, and thanks for sharing your question about your retaining wall.

Please allow me to contact you through private messaging so that I can provide you with further assistance.

Eric 

[DaveR24]

Just an update, I realised that I had built this tiered retaining wall in June 2020, so the rot started in less than 5 years.