The material used to replace the exterior wood looks like wood even though it's made of cement. These synthetic boards are much more stable than wood because they're not as affected by moisture and temperature. The stability of the exterior siding and trim translates to a direct benefit to the Owner: the paint will adhere to the boards longer so the Owner won't have to paint the exterior of the house as often. Another favorite benefit of the Owner is that the exterior is now "squirrel proof".