Hello Samir thanks for the compliment! In regards to elevated decks we think that you'll find ASCC's position statement on this issue very helpful. www.ascconline.org/Portals/0/docs/POSITION-STATEMENTS/PS-24-tolerances-suspended-concrete-slabs.pdf

Thanks for this fast response

Hello Felipe. Pertaining to new floor installations (unless contractually specified otherwise), floor measurements must be done within a 72 hour window as per ACI 117-90. ASTM 1155's Note 5 in section 8 makes specific reference to ACI 117-90 on this topic as well. That said, there can be instances where floors are measured long after installation. You may see this when the floor is going to be polished. An F number test can be done to get a baseline of the floors current F number condition. In this instance the results are only "reliable" in that they reliably reflect the floor's current condition but not necessarily the condition of the floor at the time of placement years prior. Over time, factors such as slab curl, subgrade settling, and surface wear (to name a few) can significantly impact the numbers as compared to the day of placement. Thanks for the great question Felipe. Hope this helps!

I'm trying to figure it out as well.

Hey Kevin, nice catch! We've updated the description in the video to mark where the error is and what it should be. Thank you!

Thanks Glen! Agreed. It feels great when we see labs + contractors working as partners to get great results for their clients.

Hey Ian, thanks for the kind comment and the recommendation! Keep em coming! Perhaps it is time for us to do a deep dive video. In the meantime if you want to see how FF and FL is calculated mathematically, be sure to check out the latest ASTM E1155 specification. It's all in there, albeit in a format that some may find a little difficult to digest.