Limestone and Flagstones
New and old limestone and flagstones show great variation in porosity (such porosity sometimes varies within a single tile). ‘Flags’ are generally large, thick, irregular and rectangular. Limestone tiles tend to be more modular and more refined in appearance. Colours range from beige, white, grey, brown and black. Limestone from Europe, India and the Far East are normally thinner and more regular in size. English Limestones such as Purbeck Stone, Hamstone, Bathstone, Stamford Stone, Lincolnshire Stone and Cotswold Limestone are normally thicker and in some cases vary in thickness from piece to piece. Porosity Test: May vary between 1 minute and 1 hour.