
The risk of condensation is generally inside the attic. If you have good attic ventilation that meets code, you should not need battens to create a thermal break on the roof. Here's a link to a webinar on this topic that I have done: https://www.youtube.com/watch?v=NYwD9CWveKY
Hello. Are purlins needed as an extra layer between underlayment and metal roof? We are concerned about condensation trapping moisture.
Thank you for your quick response!