Take the Purple-Roof Challenge!

So what is the Purple-Roof Challenge?

We think the Purple-Roof Concept is the coolest innovation in green roofs, and we want you to think so too!

This Challenge is designed to test your knowledge and help you get more familiar with how the Purple-Roof Concept can benefit you.


  • 30 minutes (average time)
  • 29 questions
  • All answers on Purple-Roof.com
  • Learn! about a great new technology to make cities and buildings greener and more resilient!
  • $20 to $1,000!! The top 100 participants are guaranteed to win.
  • There are currently 43 participants, so your chances of winning are extraordinarily high!

If you have already registered, please click the link you received via email.

If you have not registered, please register below.

Purple-Roof Challenge Rules

Anyone may register.

The Challenge begins Tuesday, October 20, 2020, and concludes Friday, January 1, 2021.

Winning entries will be announced on this page before January 20, 2020.

Submissions will be evaluated and ranked by according to the following criteria:

  • Correct answers receive 3 points, with up to 2 bonus points based on quality or throughness of answer.
  • Project submissions receive 5 points, with up to 10 bonus points awarded after verification of projects (we will email you!)
  • Incorrect answers receive 0 points.
  • No cheating!


  • $1,000: 1st place
  • $750: 2nd place
  • $400: 3rd place
  • $250: 4th place
  • $100: 5th place
  • $50: 6th - 20th place
  • $20: 21st - 100th place