'Linostone' is the generic name for a stone coating that has been used extensively in Scotland, especially in Glasgow and Edinburgh and is still used today. It was patented in 1960 and was used originally for the aesthetic improvement of deriorating sandstone buildings and later also for the repair of spalling or friable stone. Originally touted as a waterproof, flexible, breathable solution, it is mainly composed of resin, sand and pigment which is applied to the sandstone as a 2mm thick layer. Invariably cement repairs were carried out prior to its application and are one of its main causes of failure. Once water gets in behind the 'Linostone' it cannot escape, blistering occurs and the sandstone behind quickly deriorates.
The building below had been completely coated in 'Linostone' and we were asked to repair a particularly bad section which was blistering. After taking off the top layer which came away in our hands, we removed the cement repairs behind then scutched back the crumbling sandstone until we reached a sound surface. Colour matched, lime-based Lithomex was then applied, worked up and pointed to give an ashlar finish.
Blistering Linostone is evident on both the client's and the neighbour's walls
The friable stone is removed and prepared for Lithomex
Colour matched Lithomex is applied to the area
The finished Lithomex repairs on the left next to the neighbour's still blistering Linostone
On this complex restoration job, the stone canopy and the supporting two classical style corbels had been repaired badly many times in the past. We carefully removed the old cement and loose damaged stone. A lot of the top moulding, the door lintel and both sides of each corbel were lost, leaving just the front face of the corbels remaining. Even the protruding base of the corbels had broken off and been cement repaired.
After stabilizing and strengthening the corbels with resin, we built up the sides in stages with Lithomex. First we formed the scrolls on each side, then added the circular floral decorations and finally the ornate leaf adornment. The top moulding was reformed, the lintel recoated and finally the feet of the corbels were sculpted.
Below is a slideshow of some of the work involved in this restoration. Firstly there is a series of photos of the damaged stonework and poor cement repairs. Secondly examples of what is left after removal of ‘dead’ stone and cement. Thirdly some photos showing Lithomex work in progress and then finally the finished work.