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Answers from contractors near Silver Spring, MD

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?
Oct 18, 2014
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
Home electrical wiring: what are some safety tips for doing a home electric job?
Feb 19, 2014
Use a tester to verify the power is off before starting repair. Use pliers with insulated handles. Wrap electrical tape around switch or outlet screws before installing into box. Make sure all devises ... read more

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