If you have made the decision to hire a contractor to complete any home improvement project I would recommend they meet the following minimum qualification(s)
Make sure they are licensed in the field ... read more
black spots on the roof. can you tell me what is the cause of this? have lived in this house 12 years and have had no problems. what can you do to clean this?
This type of staining (algae as the other posters have said) will usually only happen on the North facing surface of the roof. Same with condensation on your car glass. Suprisingly, the North facing ... read more