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
How do I waterproof my basement without getting a sump pump. Water comes in during strong rain at one side of the wall where there is brick chimney outdoors,
Having spent the last 24 years inspecting and waterproofing basements both responses so far are pretty good. The one thing I would add is you need to determine where the water is penetrating. If the w ... read more