Sound and Indoor Climate
With regard to indoor climate, the building constructions must be designed and construction should be executed so there is sufficient sound isolation from external sources and between adjoining rooms. Satisfactory acoustic conditions in each of the buildings rooms, depends on the use of surface materials with absorption characteristics sufficient to ensure the required sound regulation.
SkanDek panels can be made with perforated ceiling cover and with sound batts which have good sound absorbing qualities. This is a cheap and efficient method of reducing noise in a workroom. AT Direction no. 18.104.22.168 from the Working Environment Authority (AT) contains the provisions regarding requirements for â€œAcoustics in workroomsâ€.
The requirements are given as threshold values for reverberation periods or the equivalent sound absorption area, which are calculated on the basis of sound absorption coefficients. The materialâ€™s sound absorption is an indication of how large a part of the sound energy is absorbed per surface unit
Sound Absorption Class D
SkanDek standard panels with perforated trapezoid plate on the underside.
Practical absorption coefficients, weighted absorption coefficients and absorption classification according to DS/EN ISO 11654:1997: aW = 0.40 (LM). Absorption Class: D.
Sound Absorption Class B
SkanDek standard panels with sound batts and perforated trapezoid plate on the underside. The sound batts are covered with felt to avoid shedding.
Practical absorption coefficients, weighted absorption coefficients and absorption classification according to DS/EN ISO 11654:1997: aW = 0.80. Absorption Class: B.
Up to 52 dBâ€™s sound reduction R’w over dividing wall with cement-bonded wood wool ceilings boards.
SkanDek measured sound reduction in a school construction project where the steel-roof panels were continual over the classroom dividing walls and corridors. The results showed a sound reduction R’w of 52 dBâ€™s, which fulfilled the requirements in BR95 for a sound reduction R’w of 48 dB. The sound reduction was dependant upon carefully executed airtight joints sealed against condensation and moisture vapours including installation of gypsum boards jointed against the borders of the ceiling.
Up to 58 dBâ€™s sound reduction R’w over apartment dividing walls
Sound measurements made in town houses in Vallensbæk demonstrated that careful sealing along the borders of the plaster ceiling in apartment units with continuous steel-roof panels gave a sound reduction R’w of 58 – 59 dB.
The requirement in BR-S 98 was 55 dB.
Reports and documentation of sound
- Measurement report; sound absorption class D.
- Measurement report; sound absorption class B.
- Measurement report; sound isolation R’w 55 dBâ€™s, divided apartment units(plaster board ceiling).
- Measurement report; sound isolation R’w 48 dBâ€™s, divided classroom units(concrete wood ceiling).
- Step reverberation through separating floor, cast on interlocking dovetail plates (coming soon).
- Drawings of ceiling surfaces as well as sound absorption and sound transmission.
Annexes and links for sound
- SBI Directions Section 6.4 re; acoustic indoor climate.
omparisons between acoustic ceilings.