If the floor has curled (also talked about in the ACIs I mention above) then the G.C needs to fix it.
Dipstick 2272 manual Patch#
If the floor is WAY out of flat the floor person will say that this is NOT a small patch or hole filling which is usually covered in the flooring spec. a complete cover of the floor by self leveling compoundĪnd remember 1/8 in 10 is the same as one 1/8 inch rise over a 10 foot length (think a hill) is the same at (5) 1/8 inch rises(es) in the same length (think saw tooth) both of these are 1/8 in 10 feet.Īnswer 2. it is just a technique for measuring floor flatness.Īnd yes it is hard to get 1/8 in 10 (or worse yet 1/8 in 19) without:Ģ. the ASTM does NOT limit the use of the technique to wet concrete finishing. Unless you have asked for this flatness for the floor at the time of FINAL finish flooring application. The minute the supports are gone – it does not apply. This standard 302.1R ONLY applies to slabs on grade and suspended slab – while shored. The REALLY short version is that if you have asked for these numbers they have to give them to you – AT THE TIME of finishing unless you say differently.
I love this one and have many fights over it.įf and Fl are measured with little machines see ASTM E 1155 for the machine and ACI 117 and ACI 302.1R Chapter 8 (8.15) talk about it. Nathan: that was a typo - should have been 1/8 inch in 10 feet.Īnswer 1. For comparison, our standard office slab is specified as FF=30/FL=25.
According to Section 4.5.6 of ACI 117-90 (there are newer versions available now), “Specifications for Tolerances for Concrete Construction and Materials,” suggests that 1/8" in 10' equates to FF=50.
Actually qualifing as SuperFlat, which is a very expensive level of concrete finish to perform or provide. I have seen them use a "Dipstick 2272 Floor Profiler" machine, that looks a bit like a laptop bolted to hand held metal detector.Īs for your "1/8" in 19'-0", that is exceptionally flat. To measure FF and FL numbers, I belive it requires a special machine, sold or licensed by the author of that measuring standard. To sum it up, make sure you have adequate rebar in the slab and curling is less of an issue. They state that it is easier to handle the cracking than the sawcut joints with floor leveling compound for the reason you're experiencing.ĭo you have access to ACI 302.2R-06? This goes into some detail about curling and moisture sensitive flooring.
Dipstick 2272 manual crack#
However, I've received feedback from flooring installers that they actually prefer that areas indicated to receive a resilient flooring NOT be sawcut-just leave it to crack where it wants. Geren, AIA, CSI, CCS, CCCA, SCIPĪn article (actually, an online course) that I've used is "Concrete Slab Finishes and the Use of F-Number System" at.
Dipstick 2272 manual install#
How does one reconcile the ACI F(l) values with the 1/8 inch in 10 feet measurement? And, then, assuming it curls a tiny bit to much, who's responsibility would it be to either grind or install a level compound? My spec (based on Masterspec) includes the following:"Use trowelable leveling and patching compound to fill cracks, holes, and depressions in substrates", but doesn't specifically address curling. A VCT manufacturer is stating that the edges of the concrete slab curl excessively at the saw cut joints (their literature calls for 1/8 inch in 19 feet for levelness). Two, my spec calls for F(f)25 and F(l)20.
One, how exactly does one field measure concrete slabs to see if they comply with ACI's Ff and Fl values? 4specs Discussion Forum: Concrete Ff and Fl numbers and VCT installationĪrchive - Specifications Discussions #4 »Ĭoncrete Ff and Fl numbers and VCT installation