Looks like you have a roll of APP waterproofing membrane, likely from Deco Roofing System.
Here's what you can do with it:
Roofing: This is the most common use for APP membranes, especially on flat or low-pitched roofs.
Concrete gutters: Protect your gutters from leaks and water damage.
Basements: Waterproof your basement walls to prevent moisture and seepage.
Retaining walls: Keep water from penetrating and damaging retaining walls.
Other structures: Use it wherever you need reliable waterproofing, such as terraces or balconies.