To Crack or Not to Crack-Today’s Mystery Deck Problem

Today’s mystery-the case of the cracked deck.
History, subject had a metal lath/polymer modified deck coating system installed over his OSB covered deck. Subject had a crack appear soon thereafter.

Flash forward-subject asks me to inspect his deck and give him a quote to fix.

Inspection reveals a crack in the deck, following what appears to be the seams of the OSB sheathing.

Here’s some pictures, take a look and see what you think has caused this problem.

Email me at and tell me what you think.

I’ll post my thoughts in a couple of weeks…