# Deconstruct Construction
 - [\[source code\]](https://github.com/ladybug-tools/honeybee-grasshopper-energy/blob/master/honeybee_grasshopper_energy/src//HB%20Deconstruct%20Construction.py)
Deconstruct an opaque or window construction into its constituient materials.
## Inputs
* **constr \[Required]**
An opaque or window construction to be deconstructed. This can also be text for an opaque or window construction to be looked up in the construction library.
## Outputs
* **materials**
List of material objects that make up the construction (ordered from outside to inside).
* **layers**
List of material identifiers that make up the construction (ordered from outside to inside).
* **r\_val\_si**
R-value of the construction in m2-K/W. Note that R-values do NOT include the resistance of air films on either side of the construction.
* **r\_val\_ip**
R-value of the construction in h-ft2-F/Btu. Note that R-values do NOT include the resistance of air films on either side of the construction.
* **u\_fac\_si**
U-factor of the construction in W/m2-K. Note that U-factors include the resistance of air films on either side of the construction.
* **u\_fac\_ip**
U-factor of the construction in Btu/h-ft2-F. Note that U-factors include the resistance of air films on either side of the construction.
* **shgc**
The estimated solar heat gain coefficient (SHGC) of the construction. This value is produced by finding the solution to the relationship between U-value, Solar Transmittance, and SHGC as defined for the simple glazing system material in EnergyPlus. More information can be found at on this partticular sub-page of the engineering reference: window-calculation-module.html#step-4.-determine-layer-solar-transmittance
* **t\_sol**
The unshaded shortwave solar transmittance of the construction at normal incidence. Note that 'unshaded' in this case means that all blind + shade materials in the construction are ignored.
* **t\_vis**
The unshaded visible transmittance of the window at normal incidence. Note that 'unshaded' in this case means that all blind + shade materials in the construction are ignored.
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