#roofing_material__roofingmaterial  building material used in constructing roofs
  supertype:  #building_material  material used for constructing buildings
  subtype:  #roofing_paper__roofingpaper__tar_paper__tarpaper  a heavy paper impregnated with tar and used as part of a roof for waterproofing
  subtype:  #slate.roofing_material__slating  thin layers of rock used for roofing
  subtype:  #thatch.roofing_material  plant stalks used as roofing material
  subtype:  #roofing_tile__roofingtile__tile  a thin flat slab of fired clay used for roofing
     subtype:  #hip_tile__hiptile  a tile shaped so as to cover the hip of a hip roof
     subtype:  #pantile  a roofing tile with a S-shape; laid so that curves overlap
     subtype:  #ridge_tile__ridgetile  an decorative tile that is bent in cross section; used to cover the ridge of a roof

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