A support material for use as a support for a floating moisture-sensitive floor and comprising a fibre layer (4) coated with a bituminous layer (5) surfaced with an impact sound absorbing material in the form of porous plastics bodies (6), the bituminous layer (5) being free of impact sound absorbing material in the edge zones of the support material and the plastics bodies (6) having such size that when laid with overlapping edge zones, a substantially uniform thickness is imparted to the support material all over its surface. When using the support material according to the invention, a planar, stable and durable support for a floating floor is obtained.
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