Plain Roof tiles
Plain tiles are small and rectangular in format and have always been 265mm x 165mm (or in fact 10 1/2 " x 61/2 ") in overall size, requiring 60 tiles per square metre. They perform by overlapping densely up to three tiles deep to achieve a watertight layer. It is this functional requirement that creates their distinctive appearance, adding a sense of detail and texture to the roof. This character is enhanced by the effect of cambers longitudinally and across the width. Clay plain tiles can be machine made or handmade, the latter creating the classic rustic appearance. Traditional Plain tiles create highly desirable roofscapes and have been in production to a standard size since 1666 when the Great Fire of London led to the creation of the first product standards. Wienerberger and Sandtoft manufacture both clay and concrete machine made and handmade plain roof tiles and have also introduced to the market an innovative interlocking plain tile which greatly reduces material and labour costs, and weighs 50% less per square metre.