Vent: I keep seeing guys skip the back blocking on long ceiling seams.

Did a fix-it job yesterday where a whole 16-foot seam had popped because the original crew just taped it. No backing at all. The homeowner said it cracked within a year. I had to cut it all out, sister in some 2x4s, and rehang. It added a full day to the job. Why do people think tape and mud alone will hold that span? Anyone got a good rule of thumb for when you absolutely need to block?

3 comments

3 Comments

jesse_lopez1419d ago

Yeah, and that's a solid rule. I'd say anything over 8 feet is asking for trouble without backing. The tape just can't handle the flex across that distance, especially with seasonal movement. You're basically relying on the mud as a structural bridge, which it's not meant to be. It's pure laziness or cutting corners, because adding a few blocks during framing is cheap insurance. Saves the homeowner a huge headache and saves you from a callback.

spencerross19d ago

My rule of thumb is if the seam is longer than my last failed relationship, it needs blocking.

kellyallen19d ago

My old foreman always said anything over 10 feet needs blocking, and he was right. It's the same cheap-out mindset that gives you hollow core doors in a new build.