U value of a flat roof.
Roof u value building regs.
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Table 1 below shows the u values required by building regulations for each component each decade during construction of a new dwelling.
The tables below show the suggested u values in england wales and scotland.
Check out our guide on what performance is required for the uk insulation building regulations.
Unsure what level of thermal performance you require.
Whole building energy assessments are essential for understanding how the design of each construction element contributes to the performance of the building overall.
U values sometimes referred to as heat transfer coefficients or thermal transmittances are used to measure how effective elements of a building s fabric are as insulators.
U values are important because there are certain standards according to the building regulations and standards depending on location.
Wales can get away with having a higher u value than england and scotland because it is typically less cold.
The area weighted average u values used in the notional building specifications for setting the ter are shown in table 3 below.
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The complex way in which the different parts of a building specification interact also informs compliance with national building regulations.
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The actual specification required for a compliant building and necessary building fabric u value targets may vary depending on the actual overall proposed specification and the outcome of the energy assessment.
So the lower the u value the better.
Are u values important in the building regulations approved document part l.
That is how effective they are at preventing heat from transmitting between the inside and the outside of a building.
These are expressed as a u value which needs to be achieved.
Wall 1 with u value of 0 3 w m2 k will lose heat at half the rate of wall 2 which has a u value of 0 6 w m2 k.
For example scotland buildings will need a lower u value due to the colder weather than england.
The required u value will depend on the location of the project england scotland or wales type of building domestic or non domestic and the application floor wall or roof.
To comply with part l of the building regulations 2010 all roofs to rooms except those in unheated buildings should be thermally insulated to a maximum u value of of 0 18 w m k.
