When to allow double tee placement on CMU

[Engrman]

Hey guys, Does anyone have any guidance on when double tees may be placed on CMU? Our office rule of thumb is 2 weeks or when grout reaches 75% of f'c. Contractor and precaster are pushing for sooner. Thanks.

 

[southard2]

I would wait the two weeks. If their 7 day cylinder break is adequate that would be the only time when I would allow them to load the walls sooner. Keep in mind if they were setting bar joist it probably wouldn't be a big deal. But with heavy double tee loads I'd play it conservative. By giving them the option to show you a good 7 day break you are showing that you are willing to work with them. I wouldn't go any farther than that.

John Southard, M.S., P.E.

http://www.pdhlibrary.com

 

[Ron]

Agree with S2...let the contractor bitch about it...it's what they do well.