We've got this "canopy", a number of joists/beams over an outdoor space, which mainly supports wisteria. see photos
It's appx 15yrs old now and the wood is in a poor state.
Dimensions 4.2m x 50mm x75mm
I'm thinking composite or even metal might be a better bet. Failing that are some woods better than others (given that they will be treated)?
As you can tell I'm a dummy. Thanks, Steve