# Sidewalk skylights?

**URL:** <https://forum.4specs.com/t/sidewalk-skylights/1833>\
**Category:** MasterFormat 2004 Discussions\
**Created:** [December 5, 2011, 6:42pm UTC](https://forum.4specs.com/t/sidewalk-skylights/1833 "2011-12-05T18:42:23Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![David\_Axt](https://yyz1.discourse-cdn.com/flex047/user_avatar/forum.4specs.com/david_axt/32/24_2.png) [@David\_Axt](https://forum.4specs.com/u/David_Axt)\
**Post date:** [December 5, 2011, 6:42pm UTC](https://forum.4specs.com/t/sidewalk-skylights/1833/1 "2011-12-05T18:42:23Z")

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What number should I use for cast iron and cast glass sidewalk skylights?

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**Author:** ![wilsonconsulting](https://yyz1.discourse-cdn.com/flex047/user_avatar/forum.4specs.com/wilsonconsulting/32/128_2.png) [@wilsonconsulting](https://forum.4specs.com/u/wilsonconsulting)\
**Post date:** [December 5, 2011, 7:30pm UTC](https://forum.4specs.com/t/sidewalk-skylights/1833/2 "2011-12-05T19:30:21Z")

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MasterSpec includes these systems in 04 2300 “Glass Unit Masonry.”

I have used 04 2515 “Metal-Supported Glass Unit Masonry Panels” which is consistent w/ MasterFormat 04 2513; or 04 2515 “Glass Flooring Systems” when the applications are primarily interior.

I have also used 08 4439 “Horizontal Structural Glass Assemblies” for skylights & other exterior applications.