NB: It is important to distinguish between U - values for materials (such as glass), or assemblies (such as windows, which have frames, air gaps, and so on), or elements (such as walls, which may have complex constructions comprising a number of different components). Reference Table for U Values U Value is the coefficient of transmission, i. U values of typical building methods. Heat loss, thermal mass and online calculators explained U - values measure how effective a material is an insulator.
We look in detail at terminology and core concepts when it comes to thermal performance. Since materials may vary in their k- value – even though they look the same – selecting the wrong one may have a bad effect on the U - value.
The resultant U - value may mean that. This is calculated by taking the reciprocal of the R- Value and then adding convection and radiation heat losses, as follows. We distribute thermal, acoustic and fire protection insulation products and associated materials. Our products are suitable for application across the full range of floor, wall and roof requirements. The R- values for specific assemblies like doors and glazing in the table below are generalizations because they can vary significantly.