Walls

"Enjoy a pleasant indoor climate"

Wrap up well to feel comfortable

Find protection from the cold and the noise of the outside world, while still leaving room for creativity. This means a truly insulated wall, but still with a modern face. Architecture for people.

Isover - for more commfort and efficiency

Acoustic Properties
Curtained façade components are face shells in the acoustic sense that improve sound insulation of an existing solid wall.
The quantity of improvement does not only depend on the spacing of shells, their masses per unit area, and type of attachment but is essentially determined by the mineral wool cavity filling degree.
Moreover, sound density of the façade curtain plays a role.
In such design the mineral wool absorbent will take care of absorbing the sound waves transmitted across the cavity.
Extensive tests have shown that the apparent density of a mineral wool absorbent does not play a role when damping sound waves transmitted across a cavity.
Flow resistance per unit length, too, is of minor importance:
There will be no further improvements of sound insulation above a value of 5 kPa s/m2.

Façades in front of solid walls

Two-shell external wall structures with curtain walls represent an architecturally attractive solution for representative buildings.
When refurbishing (or rehabilitating), you can also employ back-ventilated façades for later improvement of heat and sound insulation.

Test results show that improvements on usual solid external walls amounting up to
8 - 14 dB can be achieved depending on thickness of insulating layer und type of cladding.

- 200 cellular concrete with thin rendering
- Isover facade insulation board 60 mm
- 12 mm reinforced cement facade board on aluminium construction

- 200 cellular concrete with thin rendering
- Isover facade insulation board 60 mm
- 4,5 mm reinforced cement facade board on wood construction

- 200 cellular concrete with thin rendering
- Isover facade insulation board 120 mm
- 8 mm ceramic ceramic facade board on aluminium construction

- 200 cellular concrete with thin rendering
- Isover facade insulation board 120 mm
- 12 mm reinforced cement facade board on aluminium construction

- 240 sand-lime brick with rendering
- Isover facade insulation board 60 mm
- 8 mm reinforced cement facade board on aluminium construction

- 240 sand-lime brick with rendering
- Isover facade insulation board 120 mm
- 8 mm ceramic facade board on aluminium construction

Rw,R

52 dB

53 dB

55 dB

56 dB

60 dB

61 dB

ΔRw

10 dB

11 dB

13 dB

14 dB

8 dB

9 dB

Acoustic Effects
Together with the solid wall the face shell makes a two-shell mass-spring-mass system.
Improvement of sound insulation will be the higher the less dynamic stiffness of the intermediate insulating layer is.
Mineral wool acts as damping medium for sound waves transmitted across cavity on post-and-beam structures when face shells are employed.
Face shells attached to flanking components increase longitudinal sound damping between vertically or horizontally neighbored rooms.
Using face shells on external walls you need to consider suitable water vapor retarders inside the rooms out of vapor-technological reasons.

Structural Designs
In case of face shells without substructure you need to glue absorbent and cladding to the solid wall using adhesive.
The Isover Akustic face shell insulating slabs feature low stiffness improving sound insulation effectively.
Face shells with metal-sectioned or wooden substructures should not have fixed attachments to the wall.
You need to back the posts with Isover edge strips for decoupling reasons.
Isover lightweight glass wool rolls and slabs are suitable for the shelving?s cavity wall insulation.

Face Shells on Solid Walls

Face shells improve sound insulation of solid walls without significantly increasing mass per unit area.
They can be employed both on new buildings and later improvement of sound insulation on existing blocks.

Working notes
Too stiff absorbents act negatively on sound insulation of separating and flanking components.
E.g. This is expressively mentioned in Supplement 1 to DIN 4109:
"If ...
insulating slabs of high dynamic stiffness (e.g. wood excelsior building slabs or hard plastic foam slabs) are glued or concreted all-over or point-by-point sound insulation will deteriorate if insulating slabs are covered by plaster, building slabs (e.g. plasterboards) or tiles."
Supplement 2 to DIN 4109 concerning enhanced flanking transmission in conjunction with such construction methods contains a warning to the same effect.

Measurements on
test benches Rw,R

Measurements in
buildings R'w,B

- 175 mm solid sand-lime brick
- Isover Akustic HWP 2 house partition slab, 30/25 mm
- 175 mm solid sand-lime brick






- 175 mm light honeycomb bricks with rendering
- Isover Akustic HWP 2 house partition slab, 30/25 mm
- 175 mm light honeycomb bricks with rendering

- 175 mm honeycomb bricks with rendering
- Isover Akustic HWP 2 house partition slab, 30/25 mm
- 175 mm honeycomb bricks with rendering

- 200 mm reinfoced concrete
- Isover Akustic HWP 2 house partition slab, 22/20 mm
- 200 mm reinfoced concrete

Rw,R




75 dB





R'w,B




71 dB





74 dB

79 dB