system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Since plastic doesn't biodegrade, why aren't more houses built with plastic instead of wood parts?
gpt
Long pieces of plastic which are strong enough to support a house are pretty expensive and heavy; it's easier and cheaper to build a wood frame and then wrap the whole structure in thin layers of waterproof plastic + other waterproof materials to keep everything dry.