Why sponges can't be used to plug the roofing cavity

Quick summary:

• They facilitate excessive moisture build-up
• They are likely to end up in a gutter and clog it
• Only worth considering for atmosphere-controlled low-energy buildings
• Vermin protection is better be achieved by eaves combs

Source article

Interesting that Peter Hunt was the one who suggested it.

Future tasks

• Investigate further about that Metal roofing bulletin