It’s normal for a home’s foundation to stabilize over time. Even new homes experience movement that can cause small cracks to form in the concrete. But as homes age, this phenomenon can become critical if it turns into a house subsidence : a much more serious problem.
So here are some tips on what to do if your house is sagging.
How to recognize a house subsidence?
There are several easily detectable clues that can reveal the presence of a foundation subsidence problem:
- The presence of cracks in the foundation or on the exterior cladding
- Doors and windows that are difficult to close properly
- The appearance of unevenness in the floor
- Deformations of the structure of the house
- The appearance of cracks on interior walls
While not an absolute guarantee that your home will collapse, the appearance of these signs is a serious warning. From the moment you notice them, you’ll need to keep an eye out and be vigilant. If you are worried, you can also ask a specialist to inspect the foundation.
Sagging house: what are the causes?
There are two main causes that are responsible for the majority of your home’s foundation collapse problems.
Soil instability
The soil on which a home’s foundation rests can be sensitive to many elements. Drying out during periods of drought, vibrations caused by traffic, the presence of tree roots near the soil and the urbanization of the area where the residence is located can be the causes.
Each of these circumstances is likely to lead to subsidence or compaction of the ground. If this soil no longer provides a stable foundation for the foundation, the situation can cause serious structural problems.
The presence of water
Water can also contribute to the onset of sagging problems in your home. It can act in different ways. In fact, if water collects around your home due to a clogged French drain , for example, it can penetrate the concrete and cause damage. This phenomenon can be amplified by freeze-thaw cycles, while water in the concrete can cause it to burst and solidify.
In other cases, if groundwater is present under the house and is not drained properly, it can cause the soil to wash under the concrete slab, which can lead to a collapse of your home’s foundation.
How to repair the foundations of your house after a subsidence?
In the case of foundation subsidence, a solution often recommended is the installation of piles at the base of the foundations in order to level and stabilize them. This intervention is quite complex, as it requires excavating the entire perimeter of the building. For this reason, it is essential to hire a
crack repair expert
to perform the operation.
In other cases, the expert may carry out short-term reinforcement work, involving waterproofing the soil with a membrane and the addition of support posts in strategic locations.
Call on Fissure Expert to prevent your home from collapsing
A sagging house is a problem that needs to be taken very seriously. If not properly managed, a subsidence of the foundation can lead to the collapse of your home.
If the subsidence is related to a crack in the foundation, the foundation cracks must be repaired as soon as possible. The Fissure Expert Group specialises in this type of intervention.
Don’t hesitate to contact us ! Our trusted staff and foundation crack experts will be able to intervene to definitively solve your home subsidence problem.
Home Subsidence FAQ: Causes, Detecting Signs, Prevention, Risks and Solutions
What are the common causes of a house sagging?
The collapse of a house can be triggered by several factors. Common causes include deterioration of foundations, which can be due to soil variations, ground movement, or construction problems. Unstable soils, such as expansive clay, can also cause subsidence by reacting to changes in humidity. Water leaks, whether due to plumbing, drainage, or seepage problems, can weaken the foundation. In addition, in some earthquake-prone regions, tectonic movements are a potential cause of subsidence. It is crucial to identify the specific cause of the sagging to determine the best repair solution.
How can I detect signs of sagging in my house?
Signs of sagging can be seen inside and outside your home. Indoors, watch for cracks in the walls, floor, and ceiling. These cracks can be thin or wide, vertical or horizontal. Doors and windows can become difficult to open and close. You might also notice that the floor becomes uneven, with areas sagging or heaving. On the outside, look at the foundation for signs of movement, such as cracks or bulges. If you observe these signs, it is imperative to seek professional attention for a thorough evaluation.
What are the risks to the safety and structure of a house in the event of a subsidence?
The collapse of a house presents multiple risks. From a safety perspective, sagging issues can compromise the stability of the structure, which can make the home unsafe for occupants. Cracks in the walls and ceiling can get bigger, increasing the chances of falling debris. When it comes to the structure, untreated subsidence can cause serious damage to foundations, walls, and floors, which can lead to considerable repair costs. Additionally, subsidence can lead to moisture problems, mold, and water infiltration, which can affect indoor air quality and occupant health.
How can I prevent my house from sagging?
Preventing subsidence starts with regular foundation maintenance. Make sure the drains around the house are working properly to keep water away from the foundation. Monitor the soil for signs of settlement or swelling. If you live in an area prone to landslide, consider reinforcing your home’s foundation. Regular monitoring is essential to detect any early signs of problems. Hire a professional to inspect your home and advise you on preventive measures adapted to your situation.
What should I do if my house shows signs of subsidence?
If your home shows signs of sagging, the first step is to call in a foundation repair expert. They will conduct a thorough assessment to determine the cause of the subsidence and propose appropriate solutions. Repairs may include foundation reinforcement, crack filling, and other remedial actions. It is essential to follow the professional’s recommendations to restore the stability of your home. Ignoring the signs of sagging can lead to more serious and costly problems in the future.
Solutions for House Subsidence
| Technical | Use Case | Depth | Cost Per Pile | Completion Time |
|---|---|---|---|---|
| Driven steel piles | Unstable soil at depth | 4-15 meters | $2,000 – $4,0001-2 | days per pile |
| Helical piles (screws) | Clay or sandy soil | 3-10 meters | $1,500 – $3,5000000000000 | 0.5-1 day per pile |
| Expansive Resin Injection | Light Subsidence, Compressible Floors | 1-3 Meters | $1,000 – $2,500/Zone | 1 Day |
| Hydraulic lifting | Leveling after piling | Surface | Included with piling | 1-2 days |
| Foundation Replacement | Irreparable | Complete $ | 30,000 – $80,0002-4 | weeks |
Frequently Asked Questions (FAQs)
What are the signs that my house is sagging?
The most common signs are: stepped cracks in the masonry, visibly sloped floors (test with a marble), doors that no longer close, gaps between walls and ceiling, and cracks around window frames. A sagging of more than 2 cm is usually visible to the naked eye.
How much does it cost to stabilize a house that is sagging?
The cost depends on the extent of the subsidence and the number of piles needed. Expect to pay between $15,000 and $40,000 for partial piling (6-10 piles) and between $30,000 and $80,000 for complete stabilization. A structural engineer can determine the exact number of piles required.
Is house sagging covered by insurance?
Typically, progressive sagging is not covered by home insurance in Quebec, as it is considered a pre-existing soil problem. However, a sudden subsidence caused by a covered event (such as a water main break) may be eligible. Check with your insurer for details of your policy.
Can you prevent a house from collapsing?
Risks can be minimized by maintaining adequate drainage around the foundation, avoiding large trees too close to the house, monitoring soil moisture levels during droughts, and having the foundation inspected regularly. On clay soil, even watering of the perimeter in summer can prevent soil shrinkage.
Need a Crack Repair Expert?
If you notice cracks on your foundation, it is important to act quickly. Fissure Expert offers professional foundation crack injection services throughout Quebec. Call a certified foundation crack contractor for a free estimate. We serve Longueuil, Trois-Rivières, Laval and many other cities.