FAQ -Frequently Asked Questions

Insulation can be used for various purposes like, to prevent heat flow rate from high temperature to low temperature region, to prevent condensation, to minimize the unnecessary sound, to resist the fire for specific time etc.
It completely depends on the type of the application and ambient condition. There are number of insulation materials and each material can get desired result in certain specific conditions. However to evaluate the performance of the material there are certain parameter which are important that depends upon application like for thermal application R-value, for acoustic STC & NRC , For fire application “fire rating” or “fire class “ of the material.
Anywhere, when you want to minimize heat transfer rate from high temperature region to low temperature region for example, to minimize heat gain in building in summer, heat gain in cold pipeline, heat loss in building in winter, heat loss in hot pipe line. It may use for condensation prevention in case of cold application.
Insulation can be used when you want to reduce the unnecessary sound. Inside the building it can be used on wall, ceiling, floor, in door, in partition wall. Insulation can be used to create sound isolation space with help of supporting structure.
Insulation can be used to resist the fire for specific time in application like wall, glass facade etc.
It depends on the level of the desired performance you want and type of application. In thermal application it majorly depends on heat load and ambient condition. In case of the acoustic application it depends on requirement of transmission loss, reverberation time, type of the sound source, volume of the space where you want desired performance and many more. In case of fire up to what specific time you want to resist the fire that affects thickness of the insulation required.
Yes, Insulation can reduce the sound. How effectively it can reduce the sound that depends on the STC (Sound Transmission Class) and NRC (Noise Reduction coefficient) rating of the Insulation material. There are other external factors which may affect the sound reduction like type of application, frequency of the sound generated, space between sound source and material and many more.
Yes, there is some insulation which can be effective for fire. There are some tests like ASTM E-84, BS 476 which can be used to evaluate fire performance of the material. ASTM E- 84 gives the classification to the material like Class A, Class B, Class C based on FSD (Flame Spread Index) & SDI (Smoke Developed Index). In BS 476 standard fire rating is given to the material like 1 hour firer rating, two hour fire rating. There is also life safety code NFPA 101 which must comply by the building material according to NBC (National Building Code).
K-value is thermal conductivity of material which is a property of material. It show the ability of material to conduct the heat though higher temperature region to lower temperature region. For the same temperature difference lower the k-value, lower the heat flow rate and vice versa. Thermal conductivity can be defined as “the rate of the heat flow through unit thickness of material per unit area per unit temperature difference.” Quantitatively it can be defined at particular mean temperature in W/m K, W/ m °C or BTU/hr ft °F.
R-value is a measure of thermal resistance of material which shows how well material of given thickness can resist the heat flow through it. Higher the R-value, lower the heat flow rate and vice versa. Material R-value generally defined in m2 K/W, or hr ft2 °F/BTU.
The Noise Reduction Coefficient (NRC) is a single number value ranging from 0.0-1.0 that describes the average of sound absorption coefficient of an insulation material at frequencies of 250 Hz, 250 Hz, 1000 Hz & 2000 Hz.
NRC stands for how much insulation material can absorb sound. NRC of 0 means material absorbs no sound & NRC of 1 means material absorbs all sound which it face. The higher the NRC, the better the insulation material is in absorbing sound.
EX: Insulation material with 0.95 NRC rating means 95% of sound is absorbed out of total sound coming in contact with material, while the other 5% is reflected or passed through it.
By considering thermal requirement, following material can be used for various applications at home:
  • Underdeck:INROCK®, INFOAM®, INPANEL®
  • Overdeck:INFOAM®
  • False ceiling:INROCK®Encapsulated, INFOAM®,INPANEL®
  • Cavity wall:INROCK®, INFOAM®, INPANEL®
The following points need to be kept in mind while choosing insulation material:
  • You need to decide the zones for which you want to do insulation like thermal, acoustics, fire, combination of all,etc.
  • You need to decide application where you want to do insulation like wall, ceiling, floor, pipe, etc.
  • You need to decide whether you want to do insulation inside home or outside home. If it is inside home then how much space you have inside of house.
  • In case of thermal, sometimes you need to match System U value requirement & for that insulation material with lower thermal conductivity & higher thermal resistance can be selected according to requirement.
  • In case of acoustics, you need to decide whether you want to block sound (Sound Isolation) or you want to absorb sound (Sound Absorption).Ex: If it is auditorium application where sound absorption is important, you don’t want to kill the sound but you want to reduce Echo. If it is Director’s Cabin where sound Isolation is important, you want to kill the sound transmitted from Director’s cabin to outside room.
  • If there is application of sound absorption, open cell materials needs to be selected& if there is application of sound isolation, closed cell materials needs to be selected.
  • In case of acoustics, you need to check the frequency of sound produced & accordingly insulation material is selected. To cover all frequencies of sound, combinations of materials are suggested to use to get the better acoustic performance.
  • In case of fire, hot insulation materials with more fire resistance rating & best fire class should be selected to get the better fire performance.
Yes. You can absolutely add new insulation above old insulations long as it is not wet& damaged. Wet insulation can lead to mold, mildew or even the rotting of your ceiling. Insulation that is very old damaged and not performing well should be completely removed and then replaced with all new insulation.
It is to be taken care that insulation material with any type of facing can’t be used above old insulation in attic because it will trap moisture and lead to long term problems.
Open cell material Closed cell material
➤ Filled with air& it affects the way it feels & performs ➤ Completely closed that air &moisture doesn’t get inside of material
➤ Softer & more flexible ➤ Much more rigid & stable
➤ Low density material ➤ High density material
➤ Comparatively lower R value ➤ Comparatively higher R value
➤ Used for sound absorption ➤ Used for sound isolation
➤ Fixed easily at difficult places in home due to high flexibility ➤ Not easily fixed
➤ Low compressive strength ➤ High compressive strength