Patent classifications
E
FIXED CONSTRUCTIONS
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E04
BUILDING
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E04D
ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
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3/00
Roof covering by making use of flat or curved slabs or stiff sheets
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E04D3/35
Roofing slabs or stiff sheets comprising two or more layers, e.g. for insulation
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E04D3/351
at least one of the layers being composed of insulating material, e.g. fibre or foam material
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E04D3/352
at least one insulating layer being located between non-insulating layers, e.g. double skin slabs or sheets
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