Cracks: Cracks and holes in your siding will allow moisture and pests to get in. You should always make sure that the underlying problem is fixed before you repair the siding; otherwise the problem may crop up again later.

Height considerations: If your home has multiple storeys (levels), your contractor may need to have special equipment to get to the taller areas of your home. Remember, siding can be heavy and awkward to work with, so they may not be able to carry this stuff up ladders.

Find the source: It will help your Service Professional if you can pinpoint the nature of the problem before repairs begin. For example, look for obvious clues, such as overgrown tree roots or damaged gutters that let water drain out. Also check the slope of the surrounding landscape to see if it needs to be regraded to direct water away from the foundation.

-- Tips courtesy of HomeAdvisor.com