Aluminum lanai and carport frames are gaining ground in Hawaii over wood, which is good news for homeowners tired of repairs but a sign of how costly upkeep has become in the islands.

• Wood outdoor structures need constant staining and sealing, and termites eat them.
• Aluminum framing gives termites nothing to chew on and holds up better in Hawaii's salt and sun.
• Polycarbonate roof panels let light through while blocking nearly all UV rays and cutting the heat underneath.
• The trade-off is a higher upfront cost in exchange for far less maintenance later.

Outlook: Expect more Hawaii homeowners to swap wood for aluminum as termite damage and repair bills keep rising.