> For the complete documentation index, see [llms.txt](https://docs.ladybug.tools/hb-energy-primer/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ladybug.tools/hb-energy-primer/components/1_constructions/deconstruct_construction.md).

# Deconstruct Construction

![](/files/-MihpeMEiu7sKYIFlOgw)

![](/files/-MihpeMFhGoBJ0K7UvfN) - [\[source code\]](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 <https://bigladdersoftware.com/epx/docs/9-5/engineering-reference/> on this partticular sub-page of the engineering reference: window-calculation-module.html#step-4.-determine-layer-solar-transmittance&#x20;
* **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.&#x20;
* **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.&#x20;