Understanding the Pyrite Challenge

Pyrite, a mineral present in some construction materials, becomes problematic when it reacts with moisture and oxygen. Over time, this reaction causes the mineral to expand, leading to floors that lift, slabs that loosen, and joints that crack. While the reaction may slow down eventually, the damage it creates does not disappear on its own.

This was exactly the issue at office headquarters in north county Dublin. The granite floor had become unstable. Slabs were popping out of place, joints were cracking, and dangerous trip hazards were forming. Without immediate action, both safety and aesthetics would continue to decline. PMAC was called in to deliver a reliable solution.

PMAC’S solution to addressing these hazards

To address the problem effectively, PMAC followed a clear and thorough process. First, our team reset the loose granite slabs. By carefully repositioning them, we ensured that the floor became stable once again. Next, we tackled the uneven surfaces by hand grinding. This technique smoothed out any lippage, creating a level and hazard-free surface while maintaining the natural finish of the granite.

Afterwards, sections of the  floor were regrouted. By replacing cracked and damaged grout, we strengthened the joints and stabilised the slabs further. Finally, PMAC installed 150 linear metres of silicone. This flexible and durable material sealed the joints and reduced the risk of future issues caused by minor movement or moisture.

The result was a complete transformation. The hazardous and uneven granite floor became smooth, secure, and safe for everyday use. Staff and visitors could now walk through the space without concern for tripping or instability.

Has the Pyrite really settled?

In buildings affected by pyrite, many assume floor movement slows as the chemical reaction decreases. This happens when pyrite fully reacts with moisture and oxygen, often creating the illusion of stability in older structures.

However, even if visible movement stops, the damage remains. Cracks, weakened foundations, and structural issues can still pose long-term risks. Ignoring these underlying problems can lead to further complications, even years later.

To ensure safety, professional repairs are essential. While pyrite may appear inactive, its lasting impact requires careful attention and proactive solutions.

If pyrite is causing problems in your buildings floors, PMAC has the expertise to restore your floors and protect them for years to come. Contact us today to resolve the issue before it worsens.