Vinyl siding itself is water resistant just like any plastic product.
Does vinyl rot.
My house needs to either be painted or sided and i would rather side it but a couple of old timers have told me that since i live in a very humid area that moisture will get trapped between the vinyl siding and the wood siding and cause the house to rot undetectably.
Vinyl siding is not nearly as low maintenance or attractive as it first appears.
Unlike wood and masonry vinyl siding presents its own breed of maintenance worries.
And when it s installed properly with a good waterproof membrane will act as a rain screen.
Wood that gets wet can eventually develop rot mildew mold and or leaks.
Because the vinyl itself is unaffected you may not notice water infiltration or the issues that it causes rot mold and mildew until it s too late.
That lifetime vinyl covering can droop and and warp pretty quickly.
Vinyl siding does not keep water from getting behind.
Some vinyl siding companies will cover up damaged wood and side right over existing wood rot.
If vinyl siding is functioning as designed most surface rain water will run right off it.
Make a better choice.
While proper installation should guard against moisture becoming trapped beneath the vinyl siding if this does happen it will accelerate rot promote mold and mildew and invite insect infestations.