Stains on blue stone facade baseboards are a common problem, especially when they are installed using adhesive mortar.
Stains on blue stone foundation plinths are usually caused by moisture problems and/or improper installation.
In this article, we explain why stains form on Belgian blue stone, how you can prevent them, and what solutions are available for treating existing stains.
Stains on blue stone facade plinths are usually caused by moisture absorption. When the stone absorbs moisture unevenly, dark areas become visible.
Typical characteristics:
This problem occurs mainly when installing tiles using adhesive mortar applied in dots.
With spot bonding, there is no complete bond between the stone and the substrate. As a result, moisture becomes trapped behind the stone, causing it to dry unevenly and resulting in visible stains.
Blue stone is a natural material that is sensitive to changes in humidity, which makes this effect even more noticeable.
Proper installation is essential to prevent stains on natural stone. In addition, choosing the right adhesive also plays an important role.
Full-surface bonding ensures that the bond is uniform across the entire surface. In addition, use an adhesive that is specifically suitable for blue stone.
It is also important to construct the subfloor properly and to include waterproofing measures to prevent rising damp.
In many cases, mechanical fastening is actually the best solution, because this method significantly reduces the risk of moisture-related problems.
If stains are already present, there are a few possible solutions.
You can try to make the surface more uniform by using specialized products such as color enhancers or silicone oil. Impregnation can also help limit further moisture absorption.
Please note that a completely even finish cannot always be guaranteed. It is therefore recommended that you first test the product on a small area.
Are you unsure about the correct placement of blue stone facade baseboards? Proper installation prevents problems and ensures a durable and aesthetically pleasing result.
Please feel free to contact us for personalized advice.
Source
Buildwise – Fact Sheet 84
https://www.buildwise.be/nl/publicaties/infofiches/84/infofiche-84
Yes, stains can occur, especially if the product is installed incorrectly or if there are moisture problems.
Sometimes they subside in dry weather, but they rarely go away completely without treatment.
Full-surface bonding or mechanical fastening.