Fibre-reinforced (FRP) windows are sometimes pitched as an alternative to uPVC. Here's how the two compare.
FRP is strong and dimensionally stable. uPVC achieves its rigidity through multi-chamber design and steel reinforcement. Both can make sound, stable windows when well made.
Both insulate well and resist rot and rust. uPVC is the more established, widely-supported system with a broad range of styles, finishes, and hardware, and a mature supply chain for service.
For most homes, uPVC's maturity — proven performance, wide style and finish options, and easy serviceability — makes it the straightforward choice. FRP is a capable material but a smaller, less-supported ecosystem.
Both are capable, rot- and rust-proof materials. uPVC is the more established system with wider style, finish, and hardware options and easier servicing, which makes it the practical choice for most homes.
Both insulate well. The bigger practical differences are in ecosystem maturity, style range, and serviceability, where uPVC leads.
uPVC, thanks to its mature, widely-supported supply chain for hardware and replacement parts.
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