3 Basic Properties - Cetris

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3 Basic Propertiesof CETRIS ® Cement BondedParticleboard3.4 Thermal Properties(W/mK)0.23The heat conductivity or the heat conductivity coefficientrepresents the most important indicator ofbuilding materials with regard to thermal performance.The CETRIS ® cement bonded particleboard,thanks to its ideal connection of wood and cement, isGraphic relation of heat conductivity coefficient λ on material thickness da good heat conductor. For that reason their applicationarea includes all applications requiring compactmaterials with the lowest thermal resistance possibleto minimise heat loss. This is for example the caseof floor heating applications. Floor heating is dealtwith in more detail in a separatechapter, 7.10 Floor Heating.λ = max. 0.287 W/mK(for mass humidity 9 ±3 %)Heat conductivity of CETRIS ® boards in relation tothickness:CETRIS ®boardthickness(mm)HeatConductivityλ(W/mK)ThermalresistanceR(m 2 K/W)8 0.200 0.04024 0.251 0.09640 0.287 0.1390.220.21Higher humidity causes proportionalincrease of heat conductivity whichshould not exceed 0.35 W/mK.The above values of heat conductivity are measuredin dry conditions. The effect of moisture onheat conductivity is not negligible, though. Higherhumidity causes a proportional increase of heatconductivity. That is why the heat conductivityvalues should be related to a stabilised CETRIS ®board moisture level.0.20d (mm)0 5 10 15 20 25 30 35 40 45 503.5 Sound Insulation PropertiesOn the basis of evaluation of tests of acousticproperties by the Construction Research Institute inPrague the acoustic properties of CETRIS ® boardsare excellent and therefore the boards are ideal forcladding of light partitions, walls and ceilings andmay also be used as sound absorbing ceiling panels.CETRIS ® cement bonded particleboards showlow sound absorption, therefore are classified asreflexive sound barriers.For increased sound absorption it is recommendedto use CERTIS ® boards with sound absorbingmaterial.Following values have been tested for the purposeof application of the boards in sound protectionsystems:Sound transmission losscoefficient0.013Lengthwise wave spread rate 2,128 m/sMaterial constant 22.7Index R w : th. 8, 10 mm 30 dBth. 12, 14 mm 31 dBth. 16, 20 mm 32 dBth. 24 mm33 dBth. 32 mm34 dBth. 40 mm35 dBpage 26
Basic Propertiesof CETRIS ® Cement BondedParticleboard3Sound transmission loss of wall constructionsclad with CETRIS ® cement bonded particleboardOne of the possibilities to reduce noise transmissionfrom the source to the recipient is an effective noisebarrier. The ability of building structures to transferand reduce acoustic output spreading through theair is provided by acoustic materials (insulationetc.). Sound transmission loss is a feature of buildingconstruction to provide noise insulation of twoneighbouring rooms and protect the rooms fromairborne noise. The basic rule is: the higher thesound transmission loss the better!Weighed laboratory sound transmission loss Rw(dB) of selected wall constructions clad with CETRIS ®cement bonded particleboard was measured in laboratoryon specimen of prescribed size pursuant toEN ISO 140-3 Acoustics – Measurements of noisebarriers represented by building constructions andnoise barriers in buildings – Part 3: Laboratory measurementsof sound transmission loss in buildingconstructions. For the other structures of walls andpartitions the values of sound transmission loss areshown in the table on page 134 (chapter CETRIS ®Board Application in Fire Protection, Survey of FireWalls) and specified by calculation.Weighed construction sound transmission lossR`w (dB) – is STL measured in a particular buildingstructure on site. For the reason of different conditionsof measurement (effects bypasses) the resultson site are always worse than in the laboratory. Thefollowing equation applies to building sound transmissionloss R`w (dB):R`w = Rw – k (dB)Informative compositions – requirements for noise insulation between rooms in buildings pursuantto ČSN 73 0532 Acoustics – Assessment of noise insulation of building constructions and in buildingsSPACEREQUIREMENTSFOR NOISEABSORPTION BYPARTITIONSR´wResidential houses – one living room in a multi-room apartmentAll other rooms of the sameapartment unless functionalparts of the protected spaceResidential houses – apartmentAll rooms of other apartmentsCommon spaces(staircases, corridors etc.)Common unused spaces(such as lofts)Passages, subways42 dB52 dB52 dB47 dB52 dBPROPOSED COMPOSITIONCETRIS ® 12 mm, CW profile 75 + 60 mmmineral wool, CETRIS ® 12 mmCETRIS ® 2 × 12 mm, CW profile 75 + 60 mmmineral wool, CETRIS ® 2 × 12 mmCETRIS ® 2 × 12 mm, CW profile 75 + 60 mmmineral wool, CETRIS ® 2 × 12 mmCETRIS ® 12 mm, CW profile 75 + 60 mmmineral wool, CETRIS ® 12 mmCETRIS ® 2 × 12 mm, CW profile 75 + 60 mmmineral wool, CETRIS ® 2 × 12 mmHotels and accommodation facilities – bedroom space, guest roomsRooms of other guestsCETRIS47 dB® 12 mm, CW profile 75 + 60 mmmineral wool, CETRIS ® 12 mmCommon spaces47 dB(staircases, corridors etc.)Hospitals, sanatoria – wards, doctors’ officesWards, surgeries47 dBauxiliary spaces47 dBCETRIS ® 12 mm, CW profile 75 + 60 mmmineral wool, CETRIS ® 12 mmCETRIS ® 12 mm, CW profile 75 + 60 mmmineral wool, CETRIS ® 12 mmCETRIS ® 12 mm, CW profile 75 + 60 mmmineral wool, CETRIS ® 12 mmWhere “k” is the correction depending on the bypassdirection of air flow (usually k = 2 – 3 dB, inthe case of composite constructions the value isrecommended to be specified individually on thebasis of knowledge of the surroundings and thebypass direction).Schools and educational institutionsClassroomsCommon spacesNoisy rooms(gyms, workshops, dining halls)L a max.
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3 Basic Properties - Cetris

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