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Answers from contractors near N. Bethesda, 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?
Over a period of time, shingles may develop dark brown or black streaks that are sometimes mistaken for soot, dirt, moss or tree droppings.  In actuality, this discoloration may be caused by algae gro ... read more
We have a cracked stone patio and are considering other surfaces, including pavers. What do you think?
Jun 3, 2014
Mark Miles, Pavers have become extremely popular over the years. Please make sure the pavers are on a wet set concrete so you have the longevity you desire. A dry set can cause cracking with settlemen ... read more

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