Central Pomerania boasts of almost about 50 extant objects covered with roof slate. The largest group, composed of 15 objects, includes churches built during the nineteenth century. Second place as regards the number of preserved roofs covered with roof slate belongs to residential buildings in Słupsk, Białogard, Koszalin, and Bytow. Roof slate was applied also in many rural residences and cottages erected during the second half of the nineteenth century and at the beginning of the twentieth century. A distinct concentration of such objects occurs along the sea coast, in the counties of Kołobrzeg, Sławno and Słupsk. Presumably, the material in question was supplied by sea routes. In turn, the period of its employment — 187 0 -1 9 2 0 — indicates railway transport.