roofs roof covering 271 waterproof insulations 81 construction materials 75 thermal insulation 67 protection of buildings 47 ancient monuments 45 more ... reconstruction 44 tinsmith works 43 roofing 38 plates 36 architectural elements 35 insulation materials 35 roof timbers 33 repairs 28 front walls 26 wooden constructions 24 windows 24 churches (architecture) 23 building designing 21 insulation works 20 building constructions 20 asphalt 19 imperfections 19 history 18 rebuildings 18 foil 17 material jointing 17 photovoltaic cells 16 natural illumination 16 less ...