06/02/2024 Notes – Lauren Cannon
U Value: A U-Value is the measure of heat loss rom a building
Where is heat lost from a poorly insulated house?
Roof 20%
Windows 12%
Walls 36%
Doors 4%
Floors 28%
Types of insulation
Sheep’s Wool
Glass Fibre
Cellulose
Rock Mineral Wool
Foam
Plasterboard
Carpet and Underlay
Rug
Draught Strips
Rubber Draught Seals
Double or Triple Glazing
Polystyrene
Thermal Conductivity (k)
Is an important concept when considering temperature of a room
The U-Value, or thermal transmittance is the amount of heat loss in one second through 1 square
meter of 1-metre-thick materials with a 1-deghree temperature differences between the faces
Thermal Resistivity
Thermal resistivity (R) is sometimes more convenient to use than thermal conductivity (K) of a
material. Thickness (T)
It is the reciprocal of thermal conductivity, that is U–Value R = T over K
U Value: A U-Value is the measure of heat loss rom a building
Where is heat lost from a poorly insulated house?
Roof 20%
Windows 12%
Walls 36%
Doors 4%
Floors 28%
Types of insulation
Sheep’s Wool
Glass Fibre
Cellulose
Rock Mineral Wool
Foam
Plasterboard
Carpet and Underlay
Rug
Draught Strips
Rubber Draught Seals
Double or Triple Glazing
Polystyrene
Thermal Conductivity (k)
Is an important concept when considering temperature of a room
The U-Value, or thermal transmittance is the amount of heat loss in one second through 1 square
meter of 1-metre-thick materials with a 1-deghree temperature differences between the faces
Thermal Resistivity
Thermal resistivity (R) is sometimes more convenient to use than thermal conductivity (K) of a
material. Thickness (T)
It is the reciprocal of thermal conductivity, that is U–Value R = T over K
