Historic Building Riveted Steel Laser Cleaning

At the energy levels used for historic masonry, the laser removes soiling and biological growth without spalling, micro-cracking, or surface erosion. Historic and ornamental stonework is cleaned starting at the lowest effective energy level, with real-time adjustments as cleaning progresses. The cleaned surface shows no tooling marks — just clean stone.

At the energy levels used for historic masonry, the laser removes soiling and biological growth without spalling, micro-cracking, or surface erosion. Historic and ornamental stonework is cleaned starting at the lowest effective energy level, with real-time adjustments as cleaning progresses. The cleaned surface shows no tooling marks — just clean stone.

Laser cleaning removes rust and paint from historic riveted steel without removing parent metal — sandblasting removes 25–75 µm of parent metal per pass, which is unacceptable on century-old structural members where wall thickness is non-replaceable. Laser methods produce no abrasive waste requiring EPA 40 CFR Part 261 hazardous waste disposal, unlike lead-paint sandblast debris from pre-1978 structures. SSPC-SP 3 power-tool equivalent cleanliness is achievable without surface loss.

Laser cleaning removes rust, old paint, and 80 to 100 years of corrosion from historic riveted steel in one to two passes, without touching the steel underneath. Rivet heads, connection plates, and decorative ironwork come out clean with original geometry intact. The same job done by sandblasting would require lead-paint containment and remove base metal that cannot be replaced on historic structural members.