When to use levelness or super flat flooring?
Keep in mind that levelness is only used for slabongrade placement. Super flat floors require special skill and equipment to achieve and should only be used for the most critical of concrete floors in specialized programs like television studios.
Table of contents
What is the difference between flatness and levelness?
Floor Flatness (FF): The FF number essentially tells you how flat your concrete floor is. ... Floor Levelness (FL): The FL number indicates if you have any tilts or pitches in the slab. The more level your slab, the higher your number. These two numbers work together to control levelness and flatness.
What is super flat floor?
What Is a Superflat Floor? A superflat floor is built to a much tighter tolerance than a normal floor slab, using a special tolerance system called the Fmin tolerance system. This is based on defining a floor's maximum variation for a certain lift truck.
How is a Superflat floor different from an ordinary concrete floor?
Superflat floors are constructed to far tighter tolerances than conventional floor slabs using a specialized tolerance system call the “Fmin” (F minimum) tolerance system. The Fmin system is based upon defining the maximum variation in a floor surface for a particular lift truck.
What is ASTM E1155?
The test method in ASTM E1155 covers a quantitative method of measuring ﬂoor surface proﬁles to obtain estimates of the ﬂoor's characteristic FF Flatness and FL Levelness Face Floor Proﬁle numbers (FNumbers).
What is the difference between floor flatness and floor levelness?
Floor Flatness (FF): The FF number essentially tells you how flat your concrete floor is. ... Higher Fnumbers equal flatter floors. Floor Levelness (FL): The FL number indicates if you have any tilts or pitches in the slab. The more level your slab, the higher your number.
What is super flat floor?
What Is a Superflat Floor? A superflat floor is built to a much tighter tolerance than a normal floor slab, using a special tolerance system called the Fmin tolerance system. This is based on defining a floor's maximum variation for a certain lift truck.
What is floor levelness?
Floor Levelness (F) Levelness depicts how closely the finished floor matches the intended slope indicated in the design documents. Elevation differences are measured every 10feet within 72 hours after the concrete is placed and those measurements are entered into a calculation to determine floor levelness (F).
How is a Superflat floor different from an ordinary concrete floor?
Superflat floors are constructed to far tighter tolerances than conventional floor slabs using a specialized tolerance system call the “Fmin” (F minimum) tolerance system. The Fmin system is based upon defining the maximum variation in a floor surface for a particular lift truck.
How do you measure flatness and levelness of a floor?
To find the floor flatness using Fnumbers, you measure the elevation differences, d, between points on the floor, one foot part on a straight line. You calculate the differences, q, between all of the adjacent d values. Then use the mean and standard deviation of the q values to determine the FF number.
What is floor levelness?
Floor Levelness (F) Levelness depicts how closely the finished floor matches the intended slope indicated in the design documents. Elevation differences are measured every 10feet within 72 hours after the concrete is placed and those measurements are entered into a calculation to determine floor levelness (F).
What does FF 25 mean?
1) standard for the specification and measurement of concrete floor flatness and levelness. ... When a floor is described as an "F 25", it usually means "FF 25". The ACI/CSA FNumber System applies to 99% of all floor slabs  all floors that support random traffic, be it vehicular or pedestrian traffic.
How do you measure floor flatness?
Floor Flatness is measured by tracking the difference in elevation between two points 1 foot apart and comparing them with every other 1foot elevation change across a measured distance or “run.” Floor Levelness on the other hand compares the change in elevation over a distance of 10 feet, by determining the net change ...
What is a super flat floor?
What Is a Superflat Floor? A superflat floor is built to a much tighter tolerance than a normal floor slab, using a special tolerance system called the Fmin tolerance system. This is based on defining a floor's maximum variation for a certain lift truck.
What is FF & fl?
When it comes to concrete slab construction, FNumbers are the metric for quality. They consist of the concrete floor flatness (FF) and floor levelness (FL). ... Higher Fnumbers equal flatter floors. Floor Levelness (FL): The FL number indicates if you have any tilts or pitches in the slab.
What are flat floors?
According to the CTEF, “Flat means no significant high or low spots. In the tile world, the word 'flat' means that the surface does not have any significant high or low spots and will yield a smooth tile installation with no lippage between tile edges.
How flat should a concrete floor be?
Classification

Specified Overall Flatness (SOFF)

Specified Overall Levelness (SOFL)

Conventional

20

15

Moderately Flat

25

20

Flat

35

25

Very Flat

45

35

What is considered a super flat floor?
Superflat floors are a specification that describes the FF and FL required (F min 100) to support Very Narrow Aisle Lift Trucks. Additionally, Superflat for Random Traffic Floors, which is a rare occurrence, is often defined as FF100/FL50. This is a very high degree of flatness/levelness.
What are flat floors?
According to the CTEF, “Flat means no significant high or low spots. In the tile world, the word 'flat' means that the surface does not have any significant high or low spots and will yield a smooth tile installation with no lippage between tile edges.
How do I know if my concrete floor is flat?
Floor Flatness is measured by tracking the difference in elevation between two points 1 foot apart and comparing them with every other 1foot elevation change across a measured distance or “run.” Floor Levelness on the other hand compares the change in elevation over a distance of 10 feet, by determining the net change ...
How flat should a concrete floor be?
Classification

Specified Overall Flatness (SOFF)

Specified Overall Levelness (SOFL)

Conventional

20

15

Moderately Flat

25

20

Flat

35

25

Very Flat

45

35

What is ASTM E1155?
The test method in ASTM E1155 covers a quantitative method of measuring ﬂoor surface proﬁles to obtain estimates of the ﬂoor's characteristic FF Flatness and FL Levelness Face Floor Proﬁle numbers (FNumbers).
How do you read FL and FF numbers?
Floor Flatness (FF): The FF number essentially tells you how flat your concrete floor is. Bumps and grooves cause your Floor Flatness numbers to drop. Higher Fnumbers equal flatter floors. Floor Levelness (FL): The FL number indicates if you have any tilts or pitches in the slab.
How do you calculate flatness and levelness of a floor?
To find the floor flatness using Fnumbers, you measure the elevation differences, d, between points on the floor, one foot part on a straight line. You calculate the differences, q, between all of the adjacent d values. Then use the mean and standard deviation of the q values to determine the FF number.
How is floor flatness calculated?
Floor Flatness is measured by tracking the difference in elevation between two points 1 foot apart and comparing them with every other 1foot elevation change across a measured distance or “run.” Floor Levelness on the other hand compares the change in elevation over a distance of 10 feet, by determining the net change ...