If you're doing repairs on a concrete roof, cover all the air vents before pouring...

[Justdroppedin]

https://i.imgur.com/WBHwWRi.jpg

[dogdayz]

Look like someone ate at Taco Bell and didn't get the lid up in time.....:innocent:

[The Noof]

Look like someone ate at Taco Bell and didn't get the lid up in time.....:innocent:

There would be more on the walls...