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The Dangers of Sagging Floor Joists and How to Get Them Fixed Fast

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If walking around your house feels like you’re bobbing up and down on a boat in the ocean, then it could be a sign that you’ve got sagging floor joists. Uneven floors are not only harsh on the eyes, but they’re a hazard to the home.

Sagging floors can indicate there’s damaged wood under your flooring, that one of your supports is deteriorating, or that there are problems with the foundations. Here are some other signs that you’ve got issues with your surface and how to fix sagging floor joists before it’s too late.


What Are Floor Joists?

Floor joists provide additional support to the flooring above it. They’re usually made of stronger wood such as Douglas Fir, Eastern White Pine, and (most commonly) Southern Yellow Pine.

They’re generally placed under the subfloor to allow access for wires and plumbing pipes. Floor joists must be level with the subfloor and foundation in order to provide the best support for the house.

What Are the Signs of Sagging Floor Joists?

It might seem obvious to spot an uneven floor, but there are other things to look out for. Some of the common indicators that you have sagging floor joists include:

Cracks or Crumbling on the Walls Inside the House

Sagging floor joists can also cause issues for your walls. Look out for cracks or fissures in the corners and joints.

Windows and Doors Problems

All of your windows and doors should fit perfectly inside your house. But it’s a different story when you have a sagging floor. They will either become too loose that it feels like they’ll rip off the walls or too tight that it takes more effort to open and close them.

Lack of Support

Beams in older homes were initially spaced further apart. Thankfully, today’s building codes have changed the spacing requirements. But if you’re in an older house, then the larger spans between the beams and the long floor joists may be the reason why your floor is sagging.

Sloping Floors

Some homes have floors that are very uneven. Often times this is caused by long spans, moisture, and settlement. If the floors in a home are not even, there is a good chance the floor joists are not supporting as they should.

Bouncy Floors

If you hear rattling every time you walk around a corner, the floors are probably getting by with minimal support. Bouncy floors cause furniture and other items to shake and vibrate due to inadequate support. If the floors do not feel firm, that’s a sign the floor joists need more support.

How to Inspect Your Home When Your Floors Are Sagging

If you want to confirm your suspicions about your uneven floor, there are ways that you can investigate your floor joists. But you do need to know what you’re looking out for.

The easiest way to check is if you have a basement. Take a good look at the basement support beams and posts that meet the floor.

Crawl spaces are not as easy to inspect. You will want to wear protective clothing like a Tyvek suit, gloves, a headlight (or flashlight) and potentially a respirator.

While you’re in the basement or crawlspace, if you notice that it’s continuously damp, then it could be a hive for insects that love to destroy floor joists. Powderpost Beetles can turn them into swiss cheese by chewing through them. Carpenter Ants and Termites can also do plenty of damage to floor joists, particularly in the Spring.

If you are able to inspect the floor joists directly, you’ll want to see if they have fungal growth, spans greater than 10′, proper support by the beams and piers, or excessive moisture.

What Causes Sagging Floor Joists in Older Homes?

Wood tends to rot when it’s exposed to humid air and moist dirt. This can cause the joists to weaken and shift the support it’s supposed to give to the subfloor. It’s essential for you to know how your house was built so that you understand how you’re going to repair the sagging floor joists.

Why You Should Fix Sagging Floor Joists

An uneven floor can often be just the beginning of problems to occur with your home. If the reasons for the issues with your floor joists are a wet crawl space, then you can expect more troubles to come.

When a crawl space isn’t sealed off properly and protected from moisture, it can damage the floor joists, rot the wood, attract insects and pests, grow mold and bacteria.

If you’re looking to sell your house, then it will hit your hip pocket harder. Realtors must disclose to potential buyers that the foundation of a home is weak, damaged, or has sagging floors. This can potentially drop the value of your home by up to 20% if you’re looking to sell.

How to Fix Sagging Floor Joists

There are several ways to fix sagging floor joists. It will depend on the condition of the beams and the surrounding environment. Some of the most common methods of repairing sagging floor joists include:

Joist Sistering

Sistering is when an identical piece of wood gets fastened to the floor joist. This provides extra support and is better secured compared to ‘scabbing’, which can be inadequate.

Beam Replacement

One of the biggest issues with structural damage is that the conditions can affect all of the wooden framing under the house. Any structural beams that are damaged or sagging should be replaced or supported.

Structural Jacks & Beams

Long joist spans and poorly planned structural layouts cause more sagging floor joists than anything. If the beams are spaced too far apart, the long floor joists are probably stressed and bowing under the weight of the home and gravity.

A crawl space repair professional, like Bay, can install strong foundations, steel structural jacks, and new custom beams to permanently stabilize the floors and walls in almost any area.

Who You Should Contact When You Have Sagging Floor Joists

It might seem odd for some homeowners to contact someone about the space underneath their house since it is “out of sight, out of mind.” However, if your sagging floors aren’t attended to quickly, then it can lead to more serious and expensive issues in the future.

With over 5000 homes serviced, at BAY we are experts when it comes to fixing sagging floor joists. The team has over 200 years of trade experienced combined and specializes in fixing crawl spaces and foundations for all types of homes. If you’re stressing about your flooring and foundations, get in touch with BAY for a free expert analysis and quote.

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