What are Causes of Foundation Failure?
Foundation failure can be attributed to several things. Most commonly, foundation failure is caused by the movement of expansive and highly plastic soils beneath different sections of the foundation footings. This movement can be in the form of shrinkage, which causes settlement, or expansion, which causes heave. When dry conditions prevail, soils consistently lose moisture and shrink. When moisture levels are high, the opposite is true, and soils swell. Regardless of the nature of the movement, it will most likely manifest itself in the form of visible cracks in the foundation walls, exterior brick walls, or interior sheetrock or plaster walls.
Officially, any structure movement is known as differential settlement. In addition to expansive soils, subsurface peat, which has a low bearing capacity and deteriorates over time, can also cause differential settlement. Other soil types such as sand and silt also have lower than required bearing capacities. Poor drainage from yard run-off and gutter downspouts discharging at the base of the foundation are among other causes. Excess moisture around the foundation can cause the soils to become over-saturated and lose “bearing pressure,” or the strength to support weight. When this happens, structures “settle” or sink into the ground. If soil and water control problems weren’t bad enough, there is also the issue of transpiration. Transpiration is a fancy word for the process of trees and large plantings absorbing the water from the soils beneath and around your home. During an active season, roots extending beneath and around the footings of the house can remove moisture from the soil, causing it to become desiccated. Again, where expansive soils exists, this removal of moisture will cause soil shrinkage and settlement.
Water bill seems to be too high lately? Plumbing leaks are another major contributor to foundation settlement. Inundating the foundation with water from your home’s pipes will cause foundation failure, as would poor drainage on the outside. Poor construction sometimes causes settlement in homes, but only rarely.
Do New Houses Have Foundation Failure?
Unfortunately, for many homeowners, problems may develop relatively soon after the house has been completed. While older homes experience some settling over time, serious foundation failures occur more frequently in homes less than ten years old.
There’s a gap between my chimney and the house. Is this foundation failure, and can it be fixed?
Yes, a chimney pulling away from the house is a form of foundation failure. Chimneys are not structurally attached to the house. Because of the shear weight of the chimney, there is more force or pounds per square foot of load on its footing than your perimeter wall sections. When soils outside become dry and shrinks, the chimney will lean towards the lesser pressure and outward from the structure.
What is Your Method of Foundation Repair?
For the benefit of this venue, the condensed version is as follows: Depending on the structure, one of four specifically designed types of support piers are installed into the ground beneath the existing footing until load-bearing soil is reached. Tests are performed, using proven engineering methods, to determine load-bearing capacity. We then insert concrete or steel pilings to the foundation footing and lift the structure as close to original position as possible. The piers and lifting pilings remain attached and are concealed in the ground to permanently support the home. No part of the system will remain visible.
How does Your system compare to Your competitors?
We believe our concrete or steel system is the best available on the market today. No other pier method can compare on any level, whether it be loading capacity, life span, lateral stability, or versatility of use. Engineering tests and documentation prove this. Our steel pier lines are also superior in strength and life span due to the concrete upper section of our process.
Why do you offer multiple methods of pier systems?
If Your system is so much better, it must be more expensive, right?
What kind of guarantee will I get?
Will this repair completely destroy my landscape?
How long have you been in business?
Dalrock Foundation Repair Company, Inc. was established in 1990.
Do you have references?
How much do you charge for estimates?
Will you finance the repairs?
Will my homeowners insurance cover this repair?
How quickly can the work be done?
Scheduling depends on the complexity of the repair procedures, as well as weather conditions and other factors. We have crews deployed daily and work is scheduled based on received contracts. We will be more than happy to discuss a possible start date upon performing a site evaluation.
I am building a new home. Can I prevent this from happening?
Beautiful trees surround my house. I’ve heard this could be a problem. Is this true?
Yes! A single large tree with a diameter of 12″-18″ can remove as much as 150 gallons, or about 20 cubic feet, of water from the soil every day. Shrubbery and other plants can also remove large quantities of water, thereby drying out the soils. When you remove moisture from around the footings, the soil shrinks and allows the footings to settle and crack.
Can I do something OTHER than cut my trees down?
Yes. If a homeowner wishes to minimize seasonal foundation movement and damage, a controlled water program will help. This program is designed to maintain a constant level of moisture around the home’s foundation. The best way to water a foundation is to place a soaker hose one to two feet from the edge of the foundation, which allows water to soak into soils evenly. If only enough water is supplied to keep the surface damp, the program will not work.
The hose should not be placed against the foundation. This may allow water to run through cracks and accumulate around the bottom of footings. Too much water in this area will lead to lost soil bearing capacity and the house will sink and settle. An alternative is a chemically treated fabric product that is buried between the house and the tree. This deters root growth where installed while protecting your trees from the chainsaw.
I have some cracks on the walls inside my house and some of the doors won’t close. Why?
This could be an indication of structural design problems, termites, simple wood rot, or excessive water. But, more than likely, this can be attributed to loss of bearing under interior piers. Homes with crawl spaces and no vapor barrier (plastic) lose moisture over time, causing the soil to dry out and allowing settlement. Homes which have gas or propane heating units under the house use air from the crawl space for combustion of the heat exchanger, thereby drawing extra moisture out of the soils during the winter months.
The concrete in my garage is lower than it used to be. Is there anything I can do about this?
My crawlspace is very dry and dusty. Isn’t this the best thing for the foundation?
I seem to be getting water under my house from somewhere. How can I prevent this from happening?
Many companies will suggest a French drain along the interior foundation wall with a sump pump to remove water in the crawlspace. This is an inefficient and inadequate solution. The problem is not that water is standing in the crawlspace, but that water is getting there in the first place. The proper solution to this problem can be a combination of proper grading of land near the house to promote water run-off and/or a foundation drain system on the exterior of the home. This will eliminate the need for a sump pump and prevent excess water from ever reaching the crawlspace.
This way, the foundation footings never get saturated; the water is diverted before any harm can be done. Additionally, problems can occur when electrical service is out. If the power is out, the sump pump won’t work. Most power outages occur during severe storms when heavy rains increase the likelihood of flooding a crawlspace.
I’ve had another company look at my problem and they’ve suggested something completely different and I’m totally confused. How do I know what to do?
Some companies will over simplify the problem to keep the cost in line with what they think the homeowner is willing to pay, regardless of whether it is the correct solution to the problem or not. Other companies will over estimate a project (adding more repairs than are necessary) to increase workload and profits. Always deal with a licensed company specializing in foundation repair that can provide insurance information and references upon request.
A reputable company with a solid history of good business practices can mean the difference between a necessary structural repair and a nightmare. References should include professionals who are familiar with foundation repair processes and have worked with the repair company you have selected. Remember, a positive personal experience with a salesperson does not always guarantee an adequate and efficient repair. If quotes are vastly different, we suggest hiring an engineer to make recommendations for repairs to your home. Unlike a sales representative, an engineer has no vested interest in your ultimate decision to make the repairs. Then, stick to the repair plan! The engineer should approve any changes in materials or methods. We recommend contacting a soils engineer, since the usual underlying problem is in soil mechanics and not construction issues.
What Causes Cracks in a Home or an Office Building’s Foundation?
This often means the structure was built where expansive (clay) or collapsible (sand) soils are known to exist. Combine that with extreme moisture and/or poor drainage, and the structure becomes unstable. Something as simple as rain run-off from the roof and allowing the water to “pool” can cause your foundation to shift. Structures built on back-fill lots are always in danger of weakened foundations because of potential air pockets in the soil and soil composition. Large trees growing to close to your property can also cause foundation movement and settlement. Homes that do not have gutters allow rain water to be collected next to the foundation, which will cause foundation movement and settlement.
Will all Cracks in the Brick Walls Close Once the Foundation is Properly Corrected?
Will Piles Stop All Settlement of the Structure in the Future?
Once the home’s foundation has piers installed, the opportunity of movement/settling in the repaired area is extremely unlikely… so unlikely that we guarantee the areas we pier with a Lifetime Warranty. The same cannot be said about areas that do not have piers installed, but representatives try to identify all problem areas and suggest the most comprehensive repair to avoid future problems. Call us, and we will provide you with a free written estimate.