Hi Pam, I am sure the old barn boards are likely safe to use to make garden beds, if the boards are thinner like boards for fencing or siding, the raised beds may not hold up as long as thicker 2 inch boards. Either way, it sounds like you have some nice material to play around with and to make some nice raised beds or planters. Hope that helps and good luck!

Hello Eileen, while I am not entirely familiar with the materials used in the seam roofing, corrugated metal or galvanized steel would be ideal. And if so, I think it would be a great material to use for the siding of your raised beds. Good luck!

Hello Mr. Drew, we have found that raised planters don’t quite do as well as raised beds placed on the ground itself. We have an article on How to Build a Raised Garden Bed on Concrete, Patio, or Hard Surface but it doesn’t include legs and it will likely get your deck dirty due to water runoff. If you want to keep a clean deck you will likely want to find a tray/saucer that can fit underneath the planter box as you will have runoff due to watering or when it rains. Check out these raised bed kits from Gardener’s if you want a few more ideas or possibly want one ready made. Hope that helps and good luck!

Hi Rosie, using your Trex boards for raised garden beds sounds like a great way to reuse old materials to give them a second life. Good luck on building your raised beds and redoing your deck!