I think the key is figuring out if your mom will actually see any benefit from the advantages that composite materials offer.
I’m a huge fan of this stuff because if the deck is designed and built properly, it solves a whole host of problems that plague wooden decks. But you have to build it right and you have to be in a position where you’ll actually realize the benefits.
I talked my parents out of using it for their new deck. Why? Because they won’t see a return for the added cost. They’re in thier 70s and therefore it’s very unlikely that they will be in their present house long enough to see a return on the added cost.
There’s no such thing as the generic “composite decking”. Most manufacturers have specific design and installation methods for their specific material. They also have specific fasteners and construction methods.
From what I’ve heard, most people that have problems with composite have shot themselves in the foot by not following the manufacturer’s design and installation guide. Stringers too far apart, not following size and load guidelines for the deck design, not predrilling, not using the recommended fastener system or fasteners, not following the fastening method, etc, etc.
First you have to determine if it makes sense.
Grouse