Internal stonework would normally be maintenance free, although if dust accumulates this may require a light soft brushing and a wash down using clean water and a sponge. An alkaline detergent can be added and a fine abrasive may be used to remove stubborn stains.
Metal fixtures attached to stonework can cause staining due to either run-off or corrosion from the metal itself. For fixing letters or similar light weight objects stainless steel or plastic fixings should be used if required.
Heavier items should only be attached to stonework after a structural appraisal of the fixings required and the ability of the stonework to accept them, care should be taken to ensure any additional loads have been taken into account. It is generally advised that heavy items should never be attached to stone cladding.
Care should be taken to make sure that the sealant does not affect the appearance or longevity of the stone.
We do not recommend the use of sealants but in certain situations where this may be necessary (kitchen floor for example), you should consult with the sealant manufacturer for the most suitable application.
Expert guidance should be sought from reputable companies such as Lithofin for advice on sealing natural limestone.
Silicone water repellents are popular as DIY wall coatings, but must be selected carefully to ensure compatibility between the water repellent and the stonework. In old structures they should not be used on decayed or friable masonry or where salts could accumulate behind the surface.
When treating a surface such as cladding the clean appearance may last longer but there are risks involved. By sealing a section of the area or its entirety, differential weathering will occur leading to potential streaks and increased water flow down the face of the wall, this can cause penetration problems at a lower level.
Any water or moisture content trapped within the stone during sealing can cause blow out when exposed to freeze thaw action over a period of time.
Portland Stone Firms will accept no liability for an incorrect sealant used on our products.