Building A Subfloor On Uneven Concrete

In a perfect world all the old flooring and subflooring would be removed and have everything leveled with a brand new subflooring surface.

Building a subfloor on uneven concrete.

You need a dry clean and flat surface before you can install finished flooring in a room built on a concrete slab. It is best to lay the flooring plastic side down directly onto the cement floor. The most common reasons are either a basement or other concrete based surfaces or a remodel that has various levels of subflooring. Alternate subfloor system use a minimum 3 4 inch cd exposure 1 plywood sheathing 4 foot by 8 foot sheets.

You have a few options. Grind the floor use a self leveling compound or use a subfloor to get it pretty close to even as possible. You need more planning that you may expect. A good carpenter will install sleepers using shims and once the sleepers are in place and leveled you can install the plywood overtop.

Fixing an uneven floor is just more than leveling. Begin by cutting sheets to 16 inches by 8 feet or smaller panels marked 3 8 of an inch deep on back and a minimum of every 12 inches across in width. As a result the material for the subfloor will acclimate to the temperature and moisture content of the room expanding or contracting before the installation rather than after. Place 16 inch planks perpendicular or diagonal to direction of flooring.

The result is a subfloor that protects finished flooring from cold and damp concrete based floors. One of the simplest options is a sleeper based subfloor. There are many reasons that a floor surface or subflooring can be uneven.