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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
What kind of insulation is needed in the attic of my 2-story brick town house so that the 2nd floor bedrooms are as cool as the basement and 1st floor?
Aug 15, 2014
Insulation is insulation regardless of type.  Whatever the R-Value per inch of the specific material is, times the number of inches, will equal the total R-Value.  We are looking for R-49 to be Energy ... read more

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