Premier Flooring Retailer | TISE Edition | 2025

CAN I USE A STEAM CLEANER ON MY Natural Stone Floors?

Frederick M. Hueston www.stoneforensics.com

T here are many wrong ways to clean natural stone, which is why we recommend leaving heavy cleaning to an experienced stone restoration professional. As you will see in the following article from Fred M. Hueston, Chief Technical Director for SurpHaces and natural stone troubleshooting expert, steam cleaning can be problematic... I am often asked, “Can I use a steam cleaner on my natural stone floors?” Steam cleaning is a very effective way to remove soil and contaminants without harsh chemicals. However, on marble, granite, and other natural stone, steam cleaning can be harmful. Spalling Steam cleaning can cause a condition known as spalling. Since most stone is porous, the high temperature of steam cleaning can cause pressure within the stone, which can lead to pitting and/ or flaking of the surface of the stone. Sealer Removal Natural stone sealers inhibit staining. Impregnating sealers penetrate the surface of the stone. Color enhancing impregnating sealers intensify the colors in natural stone. Topical sealers form a strippable or permanent coating that covers the surface of stone. If natural stone is sealed, steam As natural stone is fabricated, transported, and installed, stress on the material can cause cracks to form. Stone may also be cracked after installation because of accidental damage or environmental stresses. If natural stone has any cracks, the heat and pressure from a steam cleaner can cause the cracks to expand and open up, making the cracks more obvious and problematic. Grout Damage cleaning can remove the sealer. Accelerated Crack Damage Grout can also be negatively impacted by continued use of steam cleaning if used regularly. Damage may include discoloration and the grout cracking and falling apart. Steam cleaning may also remove sealers that were applied to the grout. Iron Oxidation If the composition of your natural stone includes iron, steam cleaning poses a risk of discoloration. Moisture reacts with the iron, creating rust-like stains on and in the stone. Iron oxidation discoloration can be extremely difficult or even impossible to remove.

010 Premier Flooring Retailer TISE | 2025

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