SFG Insulation Application Procedure

TECHNICAL INFORMATION

ACOUSTIC FUNCTION
		SOUND ABSORPTION
		BLOCK (ATTENUATE) SOUND TRANSMISSION

SOUND ABSORPTION COEFFICIENT - The ratio between sound intensity before and after impact material.

	-	sound intensity is absorped by material
	-	each material has different sound absorption characteristics
	-	Sound Absorption Coefficient is measured at 6 frequency (125, 250, 500, 1000, 2000, 4000 Hz.)
	-	ASTM C423

NOISE REDUCTION COEFFICIENT (NRC)

The Average of Sound Absorption Coefficient at 250, 500, 1000, 2000 Hz

If NRC > 0.4 that material is Sound Absorber

Humans can not detect an NRC value difference of about 0.05

SOUND TRANSMISSION LOSS (STL) - indicates a material's capability to attenuate sound transmittance.

The higher the STL value the more effective the material is decreasing sound transmittance

SOUND TRANSMISSION CLASS (STC)

The average of Sound Transmission Loss values indicating the capability of wall, floor or ceiling system to block sound transmittance

STC is measured at 16 frequencies (125 - 4000 Hz.)

Note: - STC is measured in decibel unit (dB)

DEFINITION OF CONDENSATION

CONDENSATION

Most air will condense when it comes in contact with a surface whose temperature is equal to dew point temperature.

The greater the moisture in the air is, the greater the opportunity is for condensation to occur.

CONDENSATION PREVENTION

Use insulation with appropriate thermal resistance (density & thickness)

Use Vapor Barrier to prevent the moist air from entering the insulation

Use ventilation to decrease vapor accumulation

VAPOR BARRIER

A facing material whose vapor permeability is < 1 perm

" 1 perm " = Amount of vapor 5.72 x 10^-11 kg moves through surface 1 m²in 1 second mean while pressure difference is 1 Pa.

Usually the vapor barrier shall face the warm side.

Acoustic Board	Steel Decking	Louvers & Lenses	Insulation	Downloadable
Ceiling System	Fastening Tool	Fiber Cements Boards	Gypsum Boards	Wall & Partitions


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