# Construction calculated data

Calculated tab on Constructions
Dialog.

This tab provides further information on the heat transmission properties
of the construction.

U-values and R-Values are shown including and excluding the effect of
surface resistance and are calculated with and without bridging effects.

Note that when working with library constructions,
the outer surface resistance is calculated assuming a 'typical' exposure
to wind. When working with model constructions
the outer surface resistance is calculated using the wind exposure as
defined on the Location tab at site level.

### Convective heat transfer coefficients

The convective heat transfer coefficients displayed on this tab are only used in EnergyPlus
when the 'CIBSE' Inside/Outside convection algorithm is selected. Otherwise
EnergyPlus uses its' own convection algorithm as set in the simulation
options and the transmission data displayed here is not used.