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- Reduces the carbon footprint of your home
- Significantly reduce heat loss from your home
- Lowers your heating bills, saving you money year after year
- Controls humidity & condensation in your living areas
- Healthier for you, better for the environment
- Long term reduction in your energy consumption
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Lime Plaster and Render Insulation - Terminology
U-value
U-value Is a measure of how much heat can pass through a material or structure.
It tells you how well something insulates. The lower the U value, the better the material keeps heat from escaping. U value measures the thermal transmittance of materials as the rate of transfer of heat through matter.
In simple terms, the lower the U-value, the better the insulation. The U-value is expressed in watts per square metre per degree Celsius (W/m²K). U value depends on the thickness and type of the materials used, and how they are arranged in a structure. It considers the combined effect of layers of materials like walls, insulation and air gaps, as well as the temperature difference between the environments on either side of the material. U value is also known as thermal transmittance or overall heat transfer coefficient.
R-value
R-value is a measure of how well a material resists the flow of heat. The higher the R-value, the better the insulation. R-value is expressed in square metres per degree Celsius per watt (m²K/W). R-value measures the thermal resistance of insulation against the conductive flow of heat. R-value is also known as thermal resistance.
For example, a material with an R-value of 2 m²K/W means that for every square metre of material, a 2-degree Celsius difference in temperature will
be maintained for every watt of heat passing through it.
R-value is mainly determined by the type & thickness of the insulation material. R-value can be added up for different layers of materials to get the total R-value of a structure. However, the R-value does not account for air gaps or weak points (Called thermal bridges) that may reduce overall insulation performance.
K-value
K-value represents the thermal conductivity of a material, and it measures its ability to conduct heat. It is a measure of how easily heat passes through a material. The lower the K value, the better the insulation is. It is expressed in units of watts per meter per degree Celsius (W/m°C).
Unlike U-value & R-value, K-value depends only on the material itself, not on its thickness or temperature difference. A low K-value means the material naturally resists heat flow well. K value is also known as thermal conductivity or lambda value.
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