ABSORPTION COEFFICIENTS - acoustic

1 ABSORPTION HzMATERIALTHICKNESS125250500100020004000 MASONRY WALLSR ough concrete0,020,030,030,030,040,07 Smooth unpainted concrete0,010,010,020,020,020,05 Smooth concrete, painted or glazed0,010,010,010,020,020,02 Porous concrete blocks (no surface finish)0,050,050,050,080,140,2 Clinker concrete (no surface finish)0,100,200,400,600,500,60 Smooth brickwork with flush pointing0,020,030,030,040,050,07 Smooth brickwork with flush pointing, painted0,010,010,020,020,020,02 Standard brickwork0,050,040,020,040,050,05 Brickwork, 10mm flush pointing0,080,090,120,160,220,24 Lime cement plaster on masonry wall0,020,020,030,040,050,05 Glaze plaster on masonry wall0,010,010,010,020,020,02 Painted plaster surface on masonry wall0,020,020,020,020,020,02 Plaster on masonry wall with wall paper on backing paper0,020,030,040,050,070,08 Ceramic tiles with smooth surface0,010,010,010,020,020,02 Breeze block0,200,450,600,400,450,40 Plaster on solid wall0,040,050,060,080,040,06 Plaster, lime or gypsum on solid backing0,030,030,020,030,040,05 STUDWORK AND LIGHTWEIGHT WALLSP lasterboard on battens, 18mm airspace with glass wool0,300.

2 200,150,050,050,05 Plasterboard on frame, 100mm airspace0,300,120,080,060,060,05 Plasterboard on frame, 100mm airspace with glass wool0,080,110,050,030,020,03 Plasterboard on 50mm battens0,290,100,050,040,070,09 Plasterboard on 25mm battens0,310,330,140,100,100,122 x plasterboard on frame, 50mm airspace with mineral wool2 x 13mm0,150,100,060,040,040,05 Plasterboard on cellular core partition0,150,000,070,000,040,05 Plasterboard on frame 100mm cavity13mm0,080,110,050,030,020,03 Plasterboard on frame, 100mm cavity with mineral wool13mm0,300,120,080,060,060,052 x 13mm plasterboard on steel frame, 50mm mineral wool in cavity, surface painted26mm0,150,010,060,040,040,05 GLASS AND GLAZING4mm glass4mm0,300,200,100,070,050,026mm glass6mm0,100,060,040,030,020,02 Double glazing, 2-3mm glass, 10mm air gap0,150,050,030,030,020,02 WOOD AND WOOD PANELLING3-4mm plywood, 75mm cavity containing mineral wool10,50,30,10,050,050,055mm plywood on battens, 50mm airspace filled 0,400,350,200,150,050,0512mm plywood over 50mm airgap10,250,050,040,030,030,0212mm plywood over 150mm airgap10,280,080,070,070,090,0912mm plywood over 200mm airgap containing 50mm mineral wool10,140,100,100,080,100,08 Plywood mounted solidly0,050,050,050,0512mm plywood in framework with 30mm airspace behind12mm0,350,200,150,100,050,0512mm plywood in framework with 30mm airspace containing glass wool12mm0,400,200,150,100,100,05 Plywood, hardwood panels over 25mm airspace on solid backing0,300,200,150,100,100,05 Plywood, hardwood panels over 25mm airspace on solid backing with absorbent material in air space0,400,250,150,100,100.

3 0512mm wood panelling on 25mm battens12mm0,310,330,140,100,100,12 Timber boards, 100mm wide, 10mm gaps, 500mm airspace with mineral wool22mm0,050,250,600,150,050,10t & g board on frame, 50mm airspace with mineral wool16mm0,250,150,100,090,080,0716-22mm t&g wood on 50mm cavity filled with mineral wool0,250,150,10,090,080,07 Cedar, slotted and profiled on battens mineral wool in airspace0,200,620,980,620,210,15 Wood boards on on joists or battens0,150,200,100,100,100,1020mm dense veneered chipboard over 100mm airgap0,030,050,040,030,030,0220mm dense veneered chipboard over 200mm airgap0,060,100,080,090,070,0420mm dense veneered chipboard over 250mm airgap containing 50mm mineral wool0,120,100,080,070,100,086mm wood fibre board, cavity > 100mm, empty0,30,20,20,10,050,0522mm chipboard, 50mm cavity filled with mineral wool0,120,040,060,050,050,05 acoustic timber wall panelling0,180,340,420,590,830,68 Hardwood, mahogany0,190,230,250,300,370,42 Chipboard on 16mm battens20mm0,200,250,200,200,150,20 Chipboard on frame, 50mm airspace with mineral wool22mm0,120,040,060,050,050,05 MINERAL WOOL AND FOAMSM elamine based foam 25mm0,090,220,540,760,880,93 Melamine based foam 50mm0,180,560,961,001,001,00 Glass wool 25mm 16 kg/m30,120,280,550,710,740,83 Glass wool 50mm, 16 kg/m30,170,450,800,890,970,94 Glass wool 75mm, 16 kg/m30,300,690,941,001,001,00 Glass wool 100mm, 16 kg/m30,430,861,001,001,001,00 Glass wool 25mm, 24 kg/m30,110,320,560,770,890,91 Glass wool 50mm, 24 kg/m30,270,540,941,000,960,96 Glass wool 75mm, 24 kg/m30,280,791,001,001,001,00 Glass wool 100mm, 24 kg/m30,461,001,001,001,001.

4 00 Glass wool 50mm, 33 kg/m30,200,551,001,001,001,00 Glass wool 75mm, 33 kg/m30,370,851,001,001,001,00 Glass wool 100mm, 33 kg/m30,530,921,001,001,001,00 Glass wool 50mm, 48 kg/m30,300,801,001,001,001,00 Glass wool 75mm, 48 kg/m30,430,971,001,001,001,00 Glass wool 100mm, 48 kg/m30,651,001,001,001,001,00 Rock wool 50mm, 33 kg/m3 direct to masonry 170,150,600,900,900,900,85 Rock wool 100mm, 33 kg/m3 direct to masonry 170,350,950,980,920,900,85 Rock wool 50mm, 60 kg/m3 direct to masonry 170,110,600,960,940,920,82 Rock wool 75mm, 60 kg/m3 direct to masonry 170,340,950,980,820,870,86 Rock wool 30mm, 100 kg/m3 direct to masonry 170,100,400,800,900,900,90 Rock wool 30mm, 200 kg/m3 over 300mm air gap 170,400,750,900,800,900,85 Glass wool or mineral wool on solid backing25mm0,200,000,700,000,900,80 Glass wool or mineral wool on solid backing50mm0,300,000,800,000,950,90 Glass wool or mineral wool over air space on solid backing25mm0,400,000,800,000,900,80 Fibreglass super fine mat50mm0,150,400,750,850,800,85 Fibreglass scrim-covered sewn sheet40mm0,400,800,950,950,800,85 Fibreglass bitumen bonded mat25mm0,100,350,500,550,700,70 Fibreglass bitumen bonded mat50mm0,300,550,800,850,750,80 Fibreglass resin-bonded mat25mm0,100,350,550,650,750,80 Fibreglass resin-bonded mat50mm0,200,500,700,800,750,80 Fibreglass resin-bonded board25mm0,100,250,550,700,800,85 Flexible polyurethane foam 50mm0,250,500,850,950,900,90 Rigid polyurethane foam 50mm0,200,400,650,550,700,7012mm expanded polystyrene on 45mm battens0,050,150,400,350,200,2025mm expanded polystyrene on 50mm battens0,100,250,550,200,100.

5 15 WALL TREATMENTS & CONSTRUCTIONSCork tiles 25mm on solid backing0,050,100,200,550,600,55 Cork board, 25mm on solid backing25mm0,030,050,170,520,500,52 Cork board, 25mm, , on battens25mm0,150,400,650,350,350,30 Glass blocks or glazed tiles as wall finish0,010,000,010,000,010,01 Muslin covered cotton felt25mm0,150,450,700,850,950,85 Pin up boarding- medium hardboard on solid backing0,050,000,100,000,100,10 Fibreboard on solid backing12mm0,050,100,150,250,300,3025mm thick hair felt, covered by scrim cloth on solid backing25mm0,100,000,700,000,800,80 Fibreboard on solid backingsoft 12mm 0,050,000,150,000,300,30 Fibreboard on solid backing - painted0,050,000,100,000,150,15 Fibreboard over airspace on solid wall12mm 0,300,000,300,000,300,30 Fibreboard over airspace on solid wall - painted0,300,000,150,000,100,10 Plaster on lath, deep air space0,200,150,100,050,050,05 Plaster decorative panels, walls0,200,150,100,080,040,02 acoustic plaster to solid backing25mm0,030,150,500,800,850,809mm acoustic plaster to solid backing9mm0,020,080,300,600,800,909mm acoustic plaster on plasterboard, 75mm airspace9mm0,300,300,600,80,750, acoustic plaster on plaster backing over 75mm air ,350,350,400,550,700,70 Woodwool slabs, unplastered on solid backing25mm0,100,000,400,000,600,60 Woodwool slabs, unplastered on solid backing50mm0,100,200,450,800,600,75 Woodwool slabs, unplastered on solid backing75mm0,200,000,800,000,800,80 Woodwool slabs, unplastered over 20mm airspace on solid backing25mm0,150,000,600,000,600,70 Plasterboard backed with 25mm thick bitumen-bonded fibreglass on 50mm battens10mm0,300,200,150,050.

6 050,05 Curtains hung in folds against soild wall0,050,150,350,400,500,50 Cotton Curtains ( ),draped to 75% area approx. 130mm from wall0,300,450,650,560,590,71 Lightweight curtains ( kg/m2) hung 90mm from wall0,050,060,390,630,700,73 Curtains of close-woven glass mat hung 50mm from wall0,030,030,150,400,500,50 Curtains, medium velour, 50% gather, over soild backing0,050,250,400,500,600,50 Curtains (medium fabrics) hung straight and close to wall0,050,000,250,000,300,40 Curtains in folds against wall0,050,150,350,400,500,50 Curtains ( medium fabrics ) double widths in folds spaced away from wall0,100,000,400,000,500,60 acoustic banner, kg/m2 wool serge, 100mm from wall0,110,400,700,740,880,89 FLOORSS mooth marble or terrazzo slabs0,010,010,010,010,020,02 Raised computer floor, steel-faced 45mm chipboard 800mm above concrete floor, no carpet0,080,070,060,070,080,08 Raised computer floor, steel-faced 45mm chipboard 800mm above concrete floor, office-grade carpet tiles 0,270,260,520,430,510,58 Wooden floor on joists0,150,110,100,070,060,07 Parquet fixed in asphalt, on concrete0,040,040,070,060,060,07 Parquet on counterfloor0,200,150,100,100,050,10 Linoleum or vinyl stuck to concrete0,020,020,030,040,040,05 Layer of rubber, cork, linoleum + underlay, or vinyl+underlay stuck to concrete0,020,020,040,050,050,105mm needle-felt stuck to concrete5mm0,010.

7 020,050,150,300,406mm pile carpet bonded to closed-cell foam underlay6mm0,030,090,250,310,330,446mm pile carpet bonded to open-cell foam underlay6mm0,030,090,200,540,700,729mm pile carpet, tufted on felt underlay9mm0,080,080,300,600,750,80 Composition flooring0,050,050,050,050,050,05 Haircord carpet on felt underlay6mm0,050,050,100,200,450,65 Medium pile carpet on sponge rubber underlay10mm0,500,100,300,500,650,70 Thick pile carpet on sponge rubber underlay15mm0,150,250,500,600,700,70 Rubber floor tiles6mm0,050,050,100,100,050,05 Carpet, thin, over thin felt on concrete0,100,150,250,300,300,30 Carpet, thin, over thin felt on wood floor0,200,250,300,300,300,30 Carpet, needlepunch5mm0,030,050,050,250,350,50 Stone floor, plain or tooled or granolithic finish0,020,000,020,000,050,05 Corkfloor tiles14mm0,000,050,150,250,250,00 Sheet rubber ( hard )6mm0,000,050,050,100,050,00 Woodblock/linoleum/rubber/cork tiles (thin) on solid floor (or wall)

8 0,020,040,050,050,100,05 Floor tiles, plastic or linoleum0,030,000,030,000,050,05 Steel decking0,130,090,080,090,110,11 PANELS AND DOORSWood hollowcore door0,300,250,150,100,100,07 Solid timber door0,140,100,060,080,100,10 acoustic door, steel frame, double seals, absorbant in airspace,0,350,390,440,490,540,57 Double sheet steel wool tiles, 180mm airspace0,420,720,830,880,890,80 Mineral wool tiles, glued/screwed to soffit0,060,400,750,950,960,83 Gypsum plaster tiles, 17% perforated, 22mm 0,450,700,800,800,650,45 Metal ceiling, perforated, backed by 30mm rockwool0,120,450,870,981,001,00 Perforated underside of structural steel decking (typical, depends on perforations)0,300,700,850,900,700,6512% perforated plaster tiles, absorbent felt glued to back, 200mm ceiling void0,450,700,880,520,420,35100mm woodwool slabs on 25mm cavity, pre-screeded surface facing cavity0,500,750,850,650,700,7050mm woodwool slabs on 25mm cavity, pre-screeded surface facing cavity0,300,400,500,850,500,65100mm woodwool fixed directly to concrete, pre-screeded surface facing backing0,250,800,850,650,700,7575mm woodwool fixed directly to concrete, pre-screeded surface facing backing0,150,400,950,600,700,60 Plasterboard 10mm thick backed with 25mm thick bitumen10mm0,300,200,150,050,050,05 Plasterboard 10mm thick, perforated 8mm diameter holes 2755m2 14% open area backed with 25mm thick bitumen- bonded fibreglass on 90mm battens10mm0,250,700,850,550,400,30 Plywood, 5mm.

9 On battens 50mm airspace filled with glass wool5mm0,400,350,200,150,050,05 Plywood, 12mm, with 30mm thick fibreglass backing between 30mm battens0,400,200,150,100,100,05 Plywood 12mm thick perforated 5mm diameter holes 6200 m2 11% open area with 60mm deep air space behind0,200,350,550,300,250,30 Plywood 12mm thick perforated 5mm diameter holes 6200 m2 11% open area backed with 60mm thick fibreglass between mounting battens0,400,900,800,500,400,30 Hardboard, 25% perforated over 50mm mineral wool0,270,871,001,000,980, unperforated metal panels backed with 25mm thick resin bonded fibreglass, mounted on 22mm diameter pipes 135mm from ,500,350,150,050,050, perforated metal tiles 2mm diameter holes 29440/m2. 13% open area backed with 25mm thick resin-bonded fibreglass slab. No ,100,300,600,750,800,8050mm mineral wool ( 96 kg/m3 ) behi