How To: Build a Rot-Proof Raised Garden Bed 

I have just begun reviewing some of your videos (via a student's request and their questions)...thank you for the efforts on many I have seen thus far...will comment soon on some of them...Please understand that the perspectives shared below are not "armchair" but are validated with over 40 years of only traditional woodworking, craft, and teaching of vernacular indigenous life skills... Accoya is not available to many (most!) people around the globe, so is a little disingenuous to actually be viable for most homeowners...I have to also point out that this is such a "new concept" that just like most industrialized materials (which are overtly killing this planet) the carbon footprint and viability of this material are yet to be proven or established... 25-year warranties are often more about advertising hype than actual practicality or whether a manufacturer will honor them without the client jumping through unsurmountable legal obstacles. Because your "raised bed" is in constant earth contact, I can speak with some authority (and knowledge) that your end product will be..." out of scope"...for any warranty service and exceeds applied use for the product and/or will be a challenge to have the warranty honored... As to the fabrication process, again you have chosen an "industrial approach" rather than a traditional (joinery) approach for such a project. I use (and teach) a traditional and sustainable approach to such garden infrastructure using locally sustainably sources wood materials (usually under $1 per board foot) and the life span is typically over 30 years or greater. From my perspective, these are the methods that should be promoted...if...???...the goal is durability and sustainability in means method and materials. I'm glad to expand on this if you or the readers are interested (?) other than that, I wish you all the luck in the world with this lasting 25 years and in good service to you. It will be an interesting experiment to see how long it lasts... It would be helpful for those watching if you outline the actual manhours that when into this, and the honest material costs for all the material you have gathered together so a viable comparison between what you have built and what I have suggested above... Thanks for posting and sharing your project...!!!