Dishuser, take note.......

[chicot60]

If you're doing repairs on a concrete roof, cover all the air vents before pouring (http://i.imgur.com/WBHwWRi.jpg)......

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

[The Cobra]

Looks like all the roofers ate at Taco Palace.

[The Noof]

Looks like all the roofers ate at Taco Palace.

You beat me to it bro...lol

[dishuser]

used to reno apartments and townhomes
before tenant left they flushed a few bags of concrete
what a nightmare...building was core block

[nobodyspecial]

been known to happen to a few gcs who hadn't paid their trades too

[hutch]

Found a toilet once with glue flushed down it. the narrowing caused the liquids to pass but the solids would get stuck & cause a back up