Can you lay subfloor on concrete before framing interior walls?


I am not sure about your location. If you are in the far north it is a great policy to insulate your basement floors - rigid foam sheets and OSB is certainly a great way to do it and probably the easiest.

However if you are in a mixed climate, I am not sure what you are looking for out of the insulated floor. The energy savings will not be there as cool months will be offset by warmer months. Also with a well insulated finished basement, you shouldn't even feel a "cool" floor in the winter unless you are tiling. I live in a moderate climate. When it is 0 degrees Fahrenheit, my basement carpet is not cold.

So first think about why you are doing this. By having this "waterproof" barrier on your floor you are not fixing water issues, you are just making it longer before you notice them. If my basement sprung a leak I would want to know right away, not after a few weeks when I start noticing mold grow everywhere. Also note that you will have more work to do if you get a...

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Directly below your feet is an ingenious method of flooring that has been used for centuries--and is still employed today. It is flexible, it can be changed out, it is inexpensive. This method of laying a sturdy subfloor on top of joists and then topping the subfloor with a cosmetic-only flooring top creates a tighter, stronger structure. Layering makes it easier to change the visible floor if you tire of the look or if it has become damaged.

Relying on the joists to shoulder the brunt of the load means that this floor top can be practically anything you like, as long as it performs a few basic duties like resisting foot traffic. But one thing that this top--called the floor covering--does not have to do is provide structural support. Let's delve into the multiple flooring layers, define them, and give you installation options.

1. Top: Floor Covering (or Finish Floor)

This is the visible floor--the one you see and walk on--and can be changed out.Not required to...
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Install the sill plate.

The sill plate (sometimes called the sill, or the mud sill) consists of lengths of dimensional lumber that are laid directly on top of the foundation wall. The boards should be laid horizontally, with one edge flush with the exterior of the foundation wall. Use either 2x6 or 2x8 (50x150 mm or 50x200 mm) lumber for the sill plate. Because the sill plate contacts concrete directly, you must use pressure-treated wood. Drill holes in the boards to accommodate the anchor bolts in the foundation, and secure the boards by fastening nuts and washers onto the bolts.

To avoid problems with moisture and air circulation, you should place a sill gasket before installing the...
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Tiles are relatively durable floor coverings that can last for years when laid on a perfectly flat substrate. If a tile floor is laid on a subfloor that isn't perfectly level, however, the tiles can develop cracks. Because concrete floor surfaces frequently have small dips and hills, they must be leveled before installing tiles on them. Using a self-leveling floor compound will help ensure that the concrete is completely flat before you lay the tiles.

Check the flatness of the concrete with a level. Lay the level in various areas on the concrete to find the areas that need the most leveling. While self-leveling compounds are made to seek out highs and lows on floors, knowing where the lowest places are can let you start pouring the compound in these areas, ensuring that they get filled.

Vacuum the concrete floor well. Remove all dust and debris that may be on the floor. Anything on the concrete, including dust, can slow down the progress of the compound.

Put on...

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Installing a floating subfloor over your cement floor can add warmth, homeliness, and character to your room. You can create a floor that is appealing and that will act a barrier between the cold cement and your interior. Follow the steps below to begin preparations for this process.

The Underlayment

A floating subfloor is flooring that actually never touches cement underneath. It "floats" or rests on top of a waterproof underlayment instead. This may be made of various materials including polyethylene, plastic, or styrofoam. The underlayment exists to create an air-filled gap between the concrete below and the subflooring, which will help to insulate the floor and keep the room warmer. Additionally, the underlayment is always a waterproof material that will create a waterproof barrier.

The Subfloor

Subfloors are strong, versatile, and very durable. They are capable of sustaining heavy furniture or objects and stand up well to traffic. The...

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An illustrated look at how a typical wood-frame floor is built, including sublooring and more

Though some floors are built on a concrete slab flat on the ground, most floors are raised above the ground. Raised floors are more resilient under foot and provide access for heating equipment, insulation, plumbing, wiring, and other mechanical equipment.

A raised floor is constructed with a wooden framework that bridges from one exterior wall to another. This framework may or may not be supported intermediately by girders, beams, or walls.

On upper levels of a house, the underside of the floor framing generally serves to back ceiling materials. Ceilings are usually built just like floors, only they may be constructed of lighter materials because they’re not intended to carry the same loads.

©Don Vandervort, HomeTips

Raised Floor Framing Diagram

Floor Joists

A floor’s framework is made up mostly of wooden joists that run parallel to one another at...

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How to build studwork walls

You'll often have to build studwork partition walls on site during the framing stages of the job. They can be built to completely partition a room, divide a large room into two, to form a corridor or hallway, or build a nib for whatever reason. It's really important to build them correctly and level/plumb to save yourself loads of problems later on. If you don't get your stud work walls level, you'll have much more work making the plasterboard fit, scribing each board in. And, not enough vertical studs will not only mean a weak partition wall that flexes but you'll have difficulty when it comes to fixing the skirting boards or anything else to it later on.

If your interior wall framing is out of level there's also a chance the door will swing open or shut on its own! These are just a couple of the problems that can result from poor interior wall framing and why it's worth taking a little time to get it right now, that you'll more than save...

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Framing exterior walls of a home happens immediately after the floor is framed. Building codes require that exterior walls be sheated with plywood or oriented strand board, OSB. Walls in cooler climates are built with 2x6 framing and in warmer climates they are built with 2x4 framing. The most common layout for wall studs is 16 inches on center.

Framing exterior walls is different from interior walls. Exterior walls provide strength and rigidness to a home so they need to be anchored down with anchor bolts and sheeted with plywood or O.S.B. (Oriented Strand Board).

brief steps to framing backyard storage shed walls.Laying Out The Wall Studs, Windows And Doors Nailing The Wall Together Squaring The Wall Before Sheating Sheeting The Wall Cutting Out Openings Standing The Wall Up

tools and materials

Hammer Circular Saw Nails 2x framing lumber Sheathing Tape Measure Chalk Line

step 1 Laying Out The Wall Studs, Windows And Doors...

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The subfloor is the bottom-most layer of your floor. There are several materials you can use as subfloors, depending on the type of finish flooring that you are using. The most commonly used types of subfloors are wood and concrete, but there are other subflooring alternatives that you might consider. The installation process including moisture and thickness of the subflooring material are critical for a successful installation so make sure moisture, pattern, and glue/nail use to attach the subflooring are adequate to support the installation.

Wood Subfloor

If you are installing a wood subfloor be aware that you can use a nail-down method, a floating installation or a glue-down method. Normally, and for economical reasons, wood subfloors are made of old wooden planks or, plywood.

No matter which installation method or product you use, it is important to remove all nails and screws and to make sure that the wooden planks are leveled. We recommend using the...

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Laying a tile floor is not as hard as you might think and can save the expense of having it professionally installed. To get started you’ll need:


Pencil Tape measure Level Speed square Notched trowel Rubber float Grout sponge Tile spacers Power drill Mixing paddle 5-gallon buckets Kneepads Safety glasses and earplugs Scoring cutter or wet saw Handsaw or jamb saw


Tile Thin-set mortar Cement backer board Cement board screws Grout Sealer

Measuring Floor

Measure your floor carefully and calculate the number of square feet needed.

For square or rectangular rooms, multiply the length of the room by the width, rounding all measurements up to the nearest foot. Divide odd shaped rooms into square or rectangular sections. Calculate the square footage for each section and add them together.

Purchasing Tile

Tile comes in a wide variety of sizes, styles, and colors. Keep these points in mind when deciding on...

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Installing Plywood Subfloor: Plan Ahead

Plywood is rated for use, based on whether it’s for interior or exterior applications, and what type of material you plan to use for the finished floor. Available in standard sheets of 4 X 8 ft (1.2 X 2.5 m), your work will be easier if you minimize the number of cuts you need to make to cover the floor. Lay out your floor carefully before you start attaching sheets to the joists. Also, plan the layout so that the cut edges are against the perimeter of the room. Make sure the sheets are spaced evenly and butt each sheet tightly. The first step is to snap a line across the floor joists to mark the position of the first sheet of plywood.

Installing Plywood Subfloor: Prepare Floor Joists

Apply a consistent bead of construction adhesive on the floor joists.

Installing Plywood Subfloor: Laying the First Piece

Keeping a space of about 1/8 inches (3 mm) away from the walls to...

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