[A930Rocket]

Where is the house located and when was it built? IIRC code requires guard rails to be a minimum of 42” and that looks much lower in the picture.

If I’m not mistaken, PVC would deteriorate from UV light, overtime. Maybe there’s a UV rated PVC?

What about aluminum parts? Unless you’re near the coast, they should hold up well and have the same fittings as galvanized, pipe, etc..

Otherwise, you could go with galvanized pipe and screw the flanges on top of the wall every so many feet, at the corners and against the house. Use silicone sealant under under the flanges.

All you’re trying to do, is keep somebody from tripping and falling over the wall. Normally, you would have pickets no more than 4 inches apart, but in this case it’s keeping people from tripping over, not falling through.

My $.02