Dr.ing.
Anders Homb
SINTEF
Building & Infrastructure
Høgskoleringen 7B
NO – 7465 Trondheim, Norway.
E-mail:
anders.homb@sintef.no
Siv.ing.
Jan Arne Austnes MRIF
Sweco
Norway
Postboks
400
NO
- 1327 Lysaker, Norway
E-mail:
jaa@sweco.no
During the last years, cross-laminated
timber floor constructions have been introduced in Norway, due to an interest
among architects and producers. A more extensive use of wood in buildings is of
strategic interest in the wood industry. One possibility is to develop products
and designs for extended use in multi storey buildings. In today’s solutions,
the sound insu-lation proper¬ties of cross-laminated timber floors are
undermined due to excessive flanking transmission of the supporting walls.
Research has been conducted at SINTEF Byggforsk in collaboration with field
measurements from Sweco with respect to the development of know¬ledge and
support node solutions.
Several projects have been carried out
to investigate the properties of such solutions concer-ning airborne and impact
sound insulation. Research has been conducted earlier to develop design
criteria and vibration controlled span width. But, due to preliminary
calculations and field measure¬ment results, the main challenge is the airborne
sound insulation in the vertical direction.
Sound insulation measurements have been
carried out both in the SINTEF Byggforsk labora-tory and at different completed
constructions in buildings. In Norway, the most interesting solution has been
with an optimized top floor solution and visible cross-laminated timber in the
room below. It was found that it is possible to fulfill impact sound insulation
requirements for multifamily houses with such solutions, but in combination
with load bearing massive wood solutions, the airborne sound insulation is
limited. The paper presents some effects of different solutions at the
junctions in combination with the floor solution itself. Planned activities to
develop improved junctions with respect to airborne sound insulation will also
be presented.