Fencing & Decking

Choose a kit with  higher levels of titanium dioxide in the top layer. This prevents decay over the long-term.
Make sure the fence is  tightly fastened together and posts are accurately placed. If you are assembling your vinyl fence yourself, spend extra time measuring.

ASTM F964-94◊ refers to a voluntary quality standard for vinyl fencing manufacturers. Ask whether the manufacturer follows this standard.

Ask whether the manufacturer uses co-extrusion (bonding two layers) or mono-◊ extrusion (one-layer). Although mono-extrusion does not exclude high quality, co-extruders are likely to make longer-lasting fences.
It’s also a good idea to ask about the details of the vinyl fencing. Here are a few ◊ traits to look for:
Stainless steel gate hardware.

Aluminum or galvanized steel inserts for weak or extra-long panels.
Substantial, heavy rails and posts and notched rail-fastening systems.
Thick walls on parts and reinforced sections if you anticipate extra  stress on the fence (such as horses leaning against it).

Your vinyl fence should require little or no long-term maintenance, aside from ◊ occasional cleaning. An orange-based cleaner such as GOJO works well.