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B. Marshall LLC is a family-owned home improvement contractor known for refinishing old aluminum and vinyl siding instead of replacing it. Its crews also make seamless aluminum gutters and downspouts on site at each home, install new roofs and spray foam roofing, and handle deck repairs and new deck construction. The business dates to 1927 and has been passed down through four generations of the Marshall family.

Emergency service is available, with separate contacts for Maryland and the Phoenix area. The company is licensed in five states and serves Maryland, Virginia, the Washington metro area, Pennsylvania and the East Valley around Phoenix, Arizona. The head office is in Columbia, Maryland, and there is an Arizona office in Mesa. Weekday hours run through the early evening, with shorter Saturday hours and Sundays closed.