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A Guide On Sagging Floor Repair By HydroHelp911

Table of Contents

Sagging flooring is one of the most common complaints among older house homeowners. Every floor in my house, for example, slopes toward the central stairwell. Sagging floors can indicate growing difficulties, even merely irritation. Here’s a rundown of the most prevalent issues and some of the most common solutions.

HydroHelp911 is the name North Carolina residents trust for Basement Waterproofing, Crawl Space Repair, Foundation Repair, Crawl Space Encapsulation, Termite Damage Repair, and Mold Removal.

What Causes Sagging Floors in Older Homes?

Because the outside walls are built atop a sound, deep foundation and settle relatively little, flooring typically settled near the center of the home. However, central support beams within this boundary are frequently supported by improvised posts. Here are some of the top causes of sagging floors:

  • Design Flaws in the Floor Support Structure
    The most prevalent reason for drooping flooring is a lack of structural support. Your floor will sag if the pressure and weight of the overlying material cause the floor joists to bend downward. Installing new support frames, such as jacks, is the best technique to fix sagging floor joists. Each jack should be placed appropriately, considering the bearing weight and the joist’s strategic location.

  • Moisture Problems
    Determine whether the drooping of your floor is related to a moisture issue. If that’s the case, you’ll want to discover how to dry up your crawl space. Sealing the leaks from the exterior products and drying out the crawl space will solve the moisture problem. The sagging problem is addressed by resolving the moisture issue.

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Several jacks should be installed if your floor sags due to the settlement weight to sustain the tremendous load. Depending on the seriousness of these issues, you may need to reinforce the foundation using push piers to keep it stable and safe.

How to Inspect Your House for Sagging Floors?


If your home is built on top of a basement, start by looking over all of the basement support beams and posts where they meet the floor. Wood posts installed on dirt floors or wood posts with concrete poured around the post bases should be avoided. The home settles proportionally, bottom to top, as the posts rot and melt into the floor. Insert a metal probe or screwdriver into the position at the floor line as a test. You may have discovered your problem if this area is mushy, punky, or rotting.

Examine the floor joists for any that have been improperly cut to install pipes, wiring, or HVAC ducts. HydroHelp911 can evaluate floor joists and make recommendations.


If your basement or crawlspace has been consistently damp, look for signs of insect damage to structural parts. For example, powder post beetles leave small holes in joists and beams, carpenter ants appear at the first indication of warm weather in the spring, and termites typically leave mud tunnels on foundations and posts. Then address any moisture issues in and around the house and any deteriorating or compromised structural members.

A primary source of weaker joists is improper holes and notches caused by modifications and running service lines. In general, no cuts or penetrations should be made in the center third of any joist or anyplace along the bottom of the post. The notch depth at the end of a beam should not exceed 1/4 of the joist’s depth. The depth of the center notches (B) should not be more than 1/6 of the joist depth. Holes should be a minimum of 2′′ from the joist’s top or bottom and no more than 1/3 the joist’s depth.

Sagging Floor Repair - Where to Start?


Troubleshooting is the first step in locating the sag location for easy correction. Even though saggy flooring is apparent, you should still measure from the floor to ceiling throughout the whole floor. The information collected will help you determine the exact location of the sag and determine the best approach for repairing it. Even though typical building rules allow for a certain amount of sinking, substantial hangs should be fixed.

You can also use a carpenter’s level on a four-foot 2-by-2-inch board to determine the sag range. However, you can also use a small ball to test the direction and speed of rolling on the surface.


To examine the floor below, get under the house with a strong flashlight. Examine the joists for any cracks that may occur. It’s crucial to remember that joists with the crown side facing down will always sag over time. You’ll need to get some temporary and adjustable columns to buttress the beams to address the problem.

Get helical pier installed by HydroHelp911


Make a concrete footing to support the joists and hold them back. To be robust, you should dig down 2 feet deep and insert your footing support pillar for your concrete foundations. The height and width of the footings will depend on the standard building codes and the overlying load. 


Install a new sister or girder joist to support the old beams and provide the necessary strength. You can also install a girder that runs parallel to the sagging beam but underneath the floor and beam. To avoid future sag due to the beam being upside-down, make sure you mark the crown of the shaft. A joist should permanently be installed with the high side pointing up.

One of the advantages of floor deflection is that it may be repaired. The bad news is that it takes a long time most of the time. Sagging floors, or the broken sills and joist ends that contribute to them, are frequently remedied by jacking.

A typical scenario is installing temporary jack posts and support beams before installing permanent joists over new footings. A taut string extended across the floor will show the amount of improvement or improvement. Concrete pads with footings should be used for posts installed on dirt floors. 

Jacking must be done gently; your floor has been sinking for a long time, and you can’t force it back up rapidly without producing cracks and stress in the structure. Jacking, like other structural repairs, must be done correctly. You can’t just put a screw jack beneath the lowest point and turn it.

Ideally, someone with experience will assess the situation and erect the necessary posts and beams. The jacks can then be turned up a quarter-turn each month. Expect some cracked plaster along the road, and aim for stability and improvement rather than perfection. 

If your floor is cracked, sagging, or warped, you should be concerned. If this is the issue, you should connect with an experienced repair provider right once. An experienced service provider like HydroHelp911 will inspect your floor. Then, we will suggest measures to improve the situation. Your floor will no longer sag if you take the steps advised. We’ll also enhance your framing.



The most prevalent reason for drooping flooring is a lack of structural support. Your floor will sag if the pressure and weight of the overlying material cause the floor joists to bend downward. Installing new support frame systems, such as jacks, is the best technique to fix sagging floor joists.


Uneven or slanted flooring is rarely a sign of a severe problem with the floor. It’s a better sign that the foundation is settling or shifting beneath the flooring. If you observe a slope developing, your first call should be to a foundation expert like HydroHelp911.


Every foundation will experience the effects of gravity’s natural pressure throughout time. Time and weather are the two factors that have the most impact on the settling of your foundation. A home constructed on poor soil may experience major settling issues. In the poor ground, some houses have sunk in a short period, such as a few months.


The loss of your home’s foundation is a painful but common occurrence. Horizontal foundation cracks are a more serious concern than vertical foundation fractures, which are a common symptom of settling. 


The most expensive house repairs are usually foundation repairs. Because foundation repairs are rarely covered by homeowner’s insurance, determining whether the cost is justified can be challenging. While your final goal will determine whether or not foundation repairs are worthwhile, the answer is usually yes.

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