Inexpensive Way To Check Floor Flatness On Concrete

Check grade after strikeoff.

Inexpensive way to check floor flatness on concrete.

Concrete floor slab flatness and levelness. You can check your concrete floor leveling with dewalt laser level tool. Take a grid of 2 foot intervals over the entire floor and put the values through an equation and you get the f f value as an indication of the waviness of the floor. Traditionally allowable tolerances of concrete floor slabs were determined by checking the slab surface with a 10 foot straightedge.

History of concrete floor flatness and floor levelness. Two separate numbers. Common tolerances were 1 8 inch or 1 4 inch in 10 feet. Floor flatness and levelness are described by face floor profile numbers also called f numbers.

Lay the box open side down on the floor to be checked. November 15 2020 march 5 2020 by admin. Turn off the room lights and make the environment as dark as possible. My question is when i m checking for flatness on this concrete am i just scraping the screed or level accross it and checking where it dips or bulges or what is the method when doing this because at first i assumed that i d put my level every few inches going top to bottom or so i d put my level on the floor and check and this seems like it would take forever more like a day or longer if i m.

If the floor stays dark it is flat. The fallacy of the straightedge method was the location of the measurement. A collaboration between laser scanning data capture firms clearedge3d and rithm has resulted in a tool that is able to accurately measure floor flatness while the concrete slab is still wet. Contractors that use the astm e1155 standard method for determining floor flatness ff and floor levelness fl numbers typically take a measurement every foot along the grid lines.

How to determine if a concrete floor is flat and level. Traditionally concrete floors were specified to have a deviation of less than 1 8 over 10 feet. The f f value is primarily a result of how good the finisher was at working the surface to achieve a flat floor. Move the box around to suspect areas of the floor and check for light leaks around its edges.

This method worked quite well for decades.