Sub Floor Framing Over Cement Slab

Get a comprehensive breakdown on which materials to use what to take into consideration and what steps to take for four subfloor systems.

Sub floor framing over cement slab. Though some floors are built on a concrete slab flat on the ground most floors are raised above the ground. Lay 6 mil polyethylene sheeting over the concrete to minimize moisture migration from the concrete up into the wood flooring. Alternatively screw rows of treated 1x4s to the concrete 16 in. You can create a floor that is appealing and that will act a barrier between the cold cement and your interior.

Local and national codes contain specific requirements for framed floors and you should consult your local building department before beginning this project. On wood frame floors the subflooring provides a continuous structural surface over the floor joists. The procedure for installing a floor structure over a slab with 2 by 6 joists can be adapted to larger joist sizes if more subfloor space is required. Learn how to install beautiful hardwood floors over a concrete slab.

If the subfloor doesn t have enough stability you can usually but not always remedy the situation by installing cement backer board also called cementboard. An illustrated look at how a typical wood frame floor is built including sublooring and more. In basements and in homes with slab on grade foundations the subfloor may simply be a concrete slab. Check your local building code and pay special attention to rules concerning vapor barriers span ratings subfloor thickness and floor drains.

Follow the steps below to begin preparations for this process. Treated plywood to the concrete with concrete screws spaced every 16 in. Floated subfloor alternate subfloor glue down sub floor and the nail down subfloor system. Raised floors are more resilient under foot and provide access for heating equipment insulation plumbing wiring and other mechanical.

Use a digital moisture detector to measure the moisture content mc of the concrete slab.