![]() E04D2003/285- Roof covering by making use of flat or curved slabs or stiff sheets with special cross-section, e.g.fibre or foam material at least one insulating layer being located between non-insulating layers, e.g. for insulation at least one of the layers being composed of insulating material, e.g. E04D3/352- Roofing slabs or stiff sheets comprising two or more layers, e.g.E04D3/351- Roofing slabs or stiff sheets comprising two or more layers, e.g.E04D3/35- Roofing slabs or stiff sheets comprising two or more layers, e.g.with corrugations on both sides, with ribs, flanges, or the like of glass or other translucent material E04D3/28- Roof covering by making use of flat or curved slabs or stiff sheets with special cross-section, e.g.with corrugations on both sides, with ribs, flanges, or the like E04D3/24- Roof covering by making use of flat or curved slabs or stiff sheets with special cross-section, e.g.E04D3/00- Roof covering by making use of flat or curved slabs or stiff sheets.E04D- ROOF COVERINGS SKY-LIGHTS GUTTERS ROOF-WORKING TOOLS.E04C2/543- Hollow multi-walled panels with integrated webs.sheet materials, slabs, or panels characterised by the shape or structure with attached ribs, flanges, or the like, e.g. E04C2/38- Building elements of relatively thin form for the construction of parts of buildings, e.g.sheet materials, slabs, or panels characterised by the shape or structure E04C2/30- Building elements of relatively thin form for the construction of parts of buildings, e.g.sheet materials, slabs, or panels characterised by specified materials of wood, fibres, chips, vegetable stems, or the like of plastics of foamed products of plastics E04C2/20- Building elements of relatively thin form for the construction of parts of buildings, e.g. ![]() sheet materials, slabs, or panels characterised by specified materials of wood, fibres, chips, vegetable stems, or the like of plastics of foamed products
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