How much does it cost to replace rotten floor joists?

Basic structural repairs like floorboards can run $500 to $700 for a small section of flooring while floor joist repair can cost as much as $6,000 to $10,000 for a small room.

Floor Joist Repair Cost for a 500-Square-Foot Room.
1 2
Cost to replace floor joists, jack required $20,000+
Nov 1, 2021

Can I replace my own floor joists?

While replacing floor joists may be too daunting a task for many, homeowners with a do-it-yourself streak and a lot of determination can replace the joists themselves. Not only will this save you money, you’ll get the pride of having completed an important repair task in your home.

Can I replace a subfloor myself?

If your subfloor is in need of replacement, the damaged portion will need to be completely cut out. This also requires the removal of all floor covering over the problem area as well as the accompanying underlayment materials. The process for this portion of the job will vary based on the type of flooring you have.

How much does it cost to remove and replace a subfloor?

Average Cost of Replacing Subfloor. Replacing subfloors will cost between $1.45 and $7 per square foot for materials. Labor costs will be around $27.50 per hour. The project requires the removal of the finished flooring and damaged area and the installation of a new material.

Can you replace floor joist without removing floor?

In cases where a joist is intact, it’s possible to sister a new joist alongside with construction adhesive and lag bolts. However, when a joist loses structural support, it has to be removed and replaced. Unless the subfloor can be removed, you access the joist through a crawl space.

How do you remove and replace floor joists in an old house?

Can I put new subfloor over old subfloor?

One of the benefits of removing the old flooring is it allows you the chance to fix any loose subflooring or squeaks by re-securing the main subfloor to the floor joists prior to installing the new flooring. With all that being said though the answer is YES you can install New Wood Flooring over the old.

Is it hard to replace a subfloor?

It’s significantly more difficult than the original install. However, with the right tools and personnel it’s about midway on the carpentry skills. If the subfloor has been glued to the joists then that increases the difficulty level tremendously.

What is underneath a subfloor?


The underlayment material is installed below the floor covering and placed on top of a sub-floor. Under the visible covering, there is a layer made of soft or foam-like materials with a thickness of between 1/4- or 1/2-inch.

How many layers of plywood do you need for a subfloor?

Just 1 layer of 3/4 “ or 5/8” will do for most applications. If your finished floor is going to be heavy ceramic tiles, natural stone, and alike it may need to be thicker and or have more supports.

Should I screw or nail subfloor?

Ideally, nail down your subfloor using corrosion-resistant nails that will securely hold it in place and last a long time. Screws are a great alternative that you can easily remove, but they are not as sturdy. Screws are superior in terms of reducing floor squeaks, but the installation is slower.

Is it better to use OSB or plywood for subfloor?

The National Tile Contractors Association and the Resilient Floor Covering Institute both recommend plywood for subflooring and underlayment, because it doesn’t have the risk of swollen edges that OSB does. Plywood also has a slight advantage in stiffness, which means that subflooring panels need not be quite as thick.

What goes over subfloor?

Underlayment: Some types of flooring can be installed directly on top of the subfloor, such as vinyl flooring. Other types need a middle layer, called underlayment, such as laminate,carpet and tile.

How thick should floor joists be?

Individual Components. The bulk of the floor’s thickness comes from the joists, which are the horizontal beams that carry the floor’s weight. Joists in home construction are usually made with 2-by-10 or 2-by-12 lumber, which are 9 1/4 and 11 1/4 inches deep, respectively.

Does subfloor need to be tongue and groove?

For subflooring, you use tongue and groove plywood. The tongue and groove are only along the 8 foot edges. On the four foot edges, your seams will fall on joist tops, so no need for tongue and groove.

What are 3 common subfloor materials?

Common Subfloor Materials. There are four primary materials used as subfloor: plywood, oriented strand board (OSB), concrete, and high-performance panels. There are other subfloors materials out there, but they are used in more niche situations. The construction industry is constantly evolving.

How many floor layers should a house have?

four layers
Most floors in residential homes consist of four layers. From the top-down, they are: Floor covering: This is the finished, visible flooring surface, such as hardwood planks, carpeting, ceramic tile, or vinyl.

Does homeowners insurance cover subfloor replacement?

Insurance Coverage for Subfloor Water Damage

In some cases, you may find that the water damage is so extensive that drying the subfloor after flooding is difficult. … In such cases where the entire subfloor needs replacing, homeowners’ insurance will often cover subfloors’ replacement due to water damage.

What type of plywood is best for subfloor?

The recommended thickness of the plywood subfloor is governed by the spacing of the joists. Some experts suggest that 15/32-inch plywood should be standard if the underlying floor joists are spaced 16 inches apart or less, but slightly thicker 3/4-inch plywood should be used for joists spaced further apart.

Is MDF good for subfloor?

Using a water-resistant membrane underneath your MDF is advisable, also, especially if the underlay is over a concrete subfloor.

Pros and Cons of MDF as an Underlay Material.
Pros Cons
Capable of withstanding humidity more than wood material Potentially toxic dust
Dec 1, 2020