People sometimes wonder why their house needs to be painted so often. One of the reasons why you might be painting more than you need to is that you aren’t laying down a fresh coat of paint on a clean surface.
Layers of environmental deposits can build up on your home and be virtually undetectable to the naked eye, especially on the upper stories. Yet, when you paint over it, you are bonding onto a surface that is not firmly attached to the siding. Instead, it is something that can easily degrade from wind, water, or even sunlight. So your new coat of paint fails when the unstable layer underneath it falls off.
Extend the life of your new coat of paint by investing in some decent exterior house washing before you break out the spray rig and the rollers. It really makes a difference.