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Answers from contractors near Timonium, 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
is it standard to hold a cooling unit up by a belt to prevent it from leaning? this belt slipped and was tighten to again to prevent it from leaking
Sep 9, 2014
A belt doesn't sound like the proper material to hold anything related to air conditioning

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