Blog

Not long ago in Washington D.C. (USA), a large fire broke out in a restaurant during its ongoing remodel. Located along the Chesapeake and Ohio Canal in the bustling neighborhood of Georgetown, the fire left heavy soot (about 20-30 mils) on a variety of different substrates inside the building, including brick, concrete, stone, and wood.

Lighthouses, once critical for safe international shipping and commerce have essentially been replaced with modern navigational tools such as radio beacons and GPS. Many lighthouses remain functional with working lanterns, used as a backup tool for mariners in instances where other navigational systems have failed. 

When structural fires occur, they leave behind many hours of cleanup even if the fire doesn’t cause much structural damage. After fires, areas with affected masonry surfaces like concrete must be checked by a structural engineer to ensure entry is safe. Once the area is cleared, the restoration process can begin.

When fires occur, the immediate focus should be on preserving the health and safety of those in danger. Fire departments do amazing work saving lives and preventing fire spread throughout buildings and into nearby structures. Despite firefighters’ efforts, buildings often require robust cleaning of smoke, fire, and water damage in the aftermath.

The Milwaukee Federal Building and U.S. Courthouse is one of the most recognizable buildings in the historic downtown district of Milwaukee, Wisconsin. Completed in 1899, the Richardsonian Romanesque structure was designated as a Milwaukee City Landmark in 1972 and listed in the National Register of Historic Places the following year.

The historic restoration of Boston's Longfellow Bridge is now complete! The large-scale granite restoration project included onsite blasting by United Stone, as well as dismantling the bridge’s iconic Rockport granite “salt and pepper” towers piece-by-piece, and then transporting them to nearby workyards in Charlestown via barge for offsite restoration. The now pristine towers were reassembled using a mix of modern and historic construction technology. Skilled masons at United Stone were able to clean ornate granite carvings as well as the large granite blocks using the same equipment and media.

Marble Restoration is a task frequently faced by masonry and historic restoration contractors. Marble has been used in buildings and structures for millennia dating as far back as the ancient Greeks in the 7th century BCE. Marble mining remains a global industry with quarries spanning across six continents. As marble has been used for centuries as a building material, many buildings and structures around the world contain marble that is showing its age with discoloration and staining.

OSHA's Final Rule to protect workers from silica is now in effect. Companies that clean, restore, or prepare concrete and stone now have a greater job site responsibility related to respirable crystalline silica that becomes airborne during this process. In their Final Rule, OSHA has reduced the permissible exposure limit (PEL) for respirable crystalline silica to 50 micrograms per cubic meter of air, averaged over an 8-hour shift. To lower airborne silica created by construction processes, OSHA is requiring companies to add engineering controls to concrete, stone and other masonry cleaning and repair processes.

Projects involving granite substrates are a contractor’s most common kind of masonry restoration. Granite is a beautiful, durable stone  used on the interior and exterior of buildings, structures, and monuments.It has a Mohs hardness ratings between six and seven and therefore capable of withstanding the demands of everyday life.

The world of restoration is filled with a variety of materials. Since the dawn of time, humans have been using stone as a building medium. Unfortunately, no rock is the same. All vary in density, weight, hardness and thickness. From granite to marble, differences in composition must be a consideration when undertaking a stone restoration project.