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VELUX Modular Skylights (VMS) are sash-frame constructed single roof windows. The modules fit together and can be configured in several predefined daylight solutions. All individual skylights are delivered as prefabricated modules with dedicated factory finished flashings to ensure watertightness in every solution. The VMS include modules, which can be opened (venting) as well as modules, which cannot be opened (fixed). The EPD covers VMS modules in sizes from 0.405 m2 up to 2.3 m2. The glass panes are with double glazing and different glass configurations are covered by the EPD. The glass thickness ranges from 12 to 18 mm. The glass panes have cavities filled with Argon gas. The representative glass configuration used for the EPD calculations has 8 mm toughened glass, 16mm space and 10mm laminated glass. This configuration is conservative with regards to the environmental impact results.