Concrete Floors: The FINISHING PROCESS скачать в хорошем качестве

Concrete Floors: The FINISHING PROCESS

How to Finish Concrete Floors For Easy Install Of , Vinyl,Hardwood or What Ever You Want With modern finishing equipment, it has become relatively easy to achieve overall floor flatness. — However, you can achieve even flatter floors. Floor levelness (FL) controls the departure of the floor surface from the specified slope or plane of the surface. FL numbers evaluate the elevation differences along a sample line at 10-foot intervals. Straightedges come in length from about 8 to 16 feet to identify high and low spots on the floor surface.Also, make sure your straightedge, whether it is modified highway straight edge or not, is straight and true. If warped or damaged, you will make the floor less flat. Always make the first grinder pass perpendicular to the direction of hump and make subsequent passes perpendicular to the previous pass. Do not make grind passes in only one direction; doing so creates waves and subsequent one directional passes makes the waves deeper. To properly finish a concrete floor Make at least two grindind passes in two different directions (perpendicular to each other). Four or more passes in multiples of two makes the floor flatter, if done correctly. Some finishers claim making grinding passes at 45-degree angles to earlier passes will make the floor flatter. Also, using large grinders and heavy ride-on machines with multiple passes can make the floor even flatter. Except for the first float pass, run the ride-on trowel at full speed so the machine is easier to control. Slow down on the first float pass to minimize the risk of troughing if the concrete is too soft or if you hit a wet spot. Avoid sharp, forward turns that cause the pans to dig into the soft surface creating low spots. Consider using a forward-backward pass technique to avoid forward turns on the first float pass. Remember, creating and moving too much surface mortar typically makes the floor less flat. ACI 117-10 Specifications for Tolerances for Concrete Construction, American Concrete Institute, www.concrete.org. ACI 302.1R-04 Guide for Concrete Floor and Slab Construction, American Concrete Institute, www.concrete.org.    • Concrete Floors: The FINISHING PROCESS