Using Aluminum or Vinyl Flashing to Protect Garden Arbors
When I first built my arbor, I didn't think to use flashing to protect the top flat part of the arbor from water. Eventhough I used pressure treated wood, over time the paint on top of the arbor support boards flaked off and water soaked into the wood causing the side paint to also flaked off.
To fix this, I took aluminum flashing, and vinyl flashing on another arbor, and with a hand seamer made an attractive top for the arbor boards. I didn't realize how easy it was to use the hand seamer to make straight seams. Once I made the tops, I screwed them in with stainless steel screws and silicon caulk.
I used the plastic flashing instead of aluminum where the arbor boards were narrow (1.5 inches). I had to hand cut the strips with a razor knife and metal ruler which was tedious.