Stains on blue stone baseboards are a common problem, especially when installed with adhesive mortar.
Stains on baseboards in bluestone are usually caused by moisture problems and/or improper installation.
In this article, we explain why stains appear in Belgian bluestone, how to prevent them and solutions for treating existing stains.
Stains on baseboards in bluestone are usually caused by moisture absorption. When the stone absorbs moisture unevenly, dark areas become visible.
Typical features:
This problem occurs especially when installed with adhesive mortar in dots.
Spot bonding does not create a complete bond between the stone and the substrate. As a result, moisture remains trapped behind the stone, the stone dries unevenly and visible staining occurs.
Bluestone is a natural material that reacts sensitively to moisture differences, adding to this effect.
Correct installation is essential to avoid stains in natural stone. In addition, choosing the right adhesive also plays an important role.
Full-surface bonding ensures even adhesion over the entire surface. In addition, use an adhesive specifically for bluestone.
It is also important to build the substrate correctly and provide water-proofing measures to prevent rising damp.
In fact, in many cases, mechanical fastening is the best solution, as this method significantly reduces the risk of moisture problems.
When stains are already present, there are some possible solutions.
One can try to make the surface more homogeneous with appropriate products such as color thinners or silicone oil. Impregnation can also help reduce further moisture absorption.
Keep in mind that a completely even result cannot always be guaranteed. It is therefore advisable to test on a small area first.
Do you doubt the proper placement of blue stone plinths? Correct placement prevents problems and ensures a durable and aesthetic result.
Feel free to contact us for customized advice.
Source
Buildwise - Infofiche 84
https://www.buildwise.be/nl/publicaties/infofiches/84/infofiche-84
Yes, staining can occur especially with improper installation or moisture problems.
Sometimes they diminish in dry weather, but rarely disappear completely without treatment.
Full-surface bonding or mechanical fastening.
