The Main Causes of Buckled Foundation Damage in Wet, Freezing Climates with Clay Soils

Roles of water, frost, clay soils, and insulation in foundation damage cases
- Where and with what material can we insulate building foundation walls?
- How Avoid Foundation Cave-Ins How do we prevent foundation damage - key steps
Causes of Buckled Foundations: Is Insulation Guilty? - separate article
Ice Lenses, Frost Heaves vs. Frozen Soil Pressure - separate article
Main Cause of Foundation Failures in Clay Soils
Solar Age Magazine Articles on Renewable Energy, Energy Savings, Construction Practices
Questions & Answers about the causes of buckled building foundations for structures built in wet freezing climates and or on clay soils
References

Click to Show or Hide Related Topics

InspectAPedia tolerates no conflicts of interest. We have no relationship with advertisers, products, or services discussed at this website.

Role of frost, freezing, & clay or wet soils in foundation heaves, cracks, damage: this article explains the main causes of foundation cracks, buckling, or collapse in areas of freezing weather, clay soils, or wet soils. We provide suggestions for avoiding foundation damage or collapse in areas of freezing climate, and we discuss the proper foundation insulation locations and materials for use in problem areas. In this article series we include solar energy, solar heating, solar hot water, and related building energy efficiency improvement articles reprinted/adapted/excerpted with permission from Solar Age Magazine - editor Steven Bliss. Photo (above) shows a new foundation constructed below a New York home after a catastrophic foundation collapse caused by wet soils.

What is the Main Cause of Foundation Failures in Clay Soils?

Most foundation failures in clay soil have nothing to do with freezing. The culprit is more often the expansion of the soil when it absorbs water. In Fargo, said housing engineer Lambert Vogel, when the soil dries out and shrinks, it can pull away from the foundation as much as two inches to a depth of three feet or more. Either the wind or the homeowner is likely to fill this crack with loose soil. When the clay soil gets wet again and expands, crack goes the wall - if it is weak.

In some areas of expansive clay soils such as portions of Colorado, builders install a soil watering system below the building's foundation and slab in order to prevent this clay soil shrinkage during dry weather.

Readers who need to diagnose the cause and decide on the cure for foundation damage should start at FOUNDATION CRACKS & DAMAGE GUIDE. Readers should also see BASEMENT HEAT LOSS for a discussion of basement and foundation insulation. Contact us to suggest text changes and additions and, if you wish, to receive online listing and credit for that contribution.

Recommendations to Avoid Foundation Wall Cave-Ins in Cold Climates

Vary rarely do foundation walls cave in from insulation, except possibly in Duluth, Minnesota, where all the conditions are ripe for foundation failure: lots of rainfall, clay soils, very cold winters, and building practices that often do not include foundation drainage to assure that soils close to the building foundation are not water-saturated.

But you can prevent all frost-related foundation damage problems by following standard good building practices:

Provide positive site drainage - do not direct surface or roof water spillage against or close to the building foundation
Use granular backfill or gravel around foundation walls, including footing drains that carry water to daylight well away from the building
Build foundation walls strong enough to withstand unavoidable intermittent pressures and loads exerted by water or ice.
If your foundation insulation is to be installed on the outside of the wall, use a material such as Styrofoam that will not lose its insulating value when exposed to moisture or water.
If your foundation insulation is to be installed on the inside of the foundation wall, we still prefer using insulating foam board products such as high R-value urethane foam boards rather than fiberglass insulation. That's because fiberglass against or close to a below-ground-level building foundation is exposed to moisture from both the building interior as well as from the building exterior. Moist or wet fiberglass insulation not only loses its insulating value, but it can become a problematic mold reservoir in the building. (See FIBERGLASS INSULATION MOLD.)

Given basically sound foundation and site work, it is acceptable to insulate a building foundation inside (giving up the thermal mass benefits to the building) or outside, and to install foundation wall insulation half-way, full-height, or flared-out - anywhere in the continental United States.

In foundation insulation retrofits in very cold climates, life is not so simple. What if you have an un reinforced concrete block foundation, a frost-susceptible soil (clay or silt), and poor site drainage? Then we would be reluctant to install any foundation insulation without first correcting the site - at the very least by conducting surface water and roof spillage well away from the building foundation.

Where the integrity of the foundation wall is in doubt, there are compromise solutions. We might install half-height insulation on the inside of the foundation wall, or half-height insulation n the outside of the foundation wall with the addition of at 2- to 4-foot flare. But don't expect good thermal performance with half-height interior foundation insulation on an open-core concrete block foundation wall. Convection in the concrete block cores will carry heat right past the insulation.

Also consider the wintertime temperatures in the basement or crawl space. If the building owners have insulated the basement or crawl space ceiling, and are heating with a woodstove upstairs rather than a furnace or boiler in the basement, the basement walls, not to mention the water pipes (see WINTERIZE A BUILDING), could get very cold.

Here we include solar energy, solar heating, solar hot water, and related building energy efficiency improvement articles reprinted/adapted/excerpted with permission from Solar Age Magazine - editor Steven Bliss.

Frequently Asked Questions (FAQs) about causes of foundation buckling or collapse

...

Ask a Question or Search InspectApedia

Use the search box below to ask a question or to search the InspectApedia.com website.

Ask a Question or Enter Search Terms in the InspectApedia search box just below.

Technical Reviewers & References

Related Topics, found near the top of this page suggest articles closely related to this one.

Solar Age Magazine was the official publication of the American Solar Energy Society. The contemporary solar energy magazine associated with the Society is Solar Today. "Established in 1954, the nonprofit American Solar Energy Society (ASES) is the nation's leading association of solar professionals & advocates. Our mission is to inspire an era of energy innovation and speed the transition to a sustainable energy economy. We advance education, research and policy. Leading for more than 50 years. ASES leads national efforts to increase the use of solar energy, energy efficiency and other sustainable technologies in the U.S. We publish the award-winning SOLAR TODAY magazine, organize and present the ASES National Solar Conference and lead the ASES National Solar Tour – the largest grassroots solar event in the world."
Steve Bliss's Building Advisor at buildingadvisor.com helps homeowners & contractors plan & complete successful building & remodeling projects: buying land, site work, building design, cost estimating, materials & components, & project management through complete construction. Email: info@buildingadvisor.com
Steven Bliss served as editorial director and co-publisher of The Journal of Light Construction for 16 years and previously as building technology editor for Progressive Builder and Solar Age magazines. He worked in the building trades as a carpenter and design/build contractor for more than ten years and holds a masters degree from the Harvard Graduate School of Education. Excerpts from his recent book, Best Practices Guide to Residential Construction, Wiley (November 18, 2005) ISBN-10: 0471648361, ISBN-13: 978-0471648369, appear throughout this website, with permission and courtesy of Wiley & Sons. Best Practices Guide is available from the publisher, J. Wiley & Sons, and also at Amazon.com

Books & Articles on Building & Environmental Inspection, Testing, Diagnosis, & Repair

Our recommended books about building & mechanical systems design, inspection, problem diagnosis, and repair, and about indoor environment and IAQ testing, diagnosis, and cleanup are at the InspectAPedia Bookstore. Also see our Book Reviews - InspectAPedia.

The Home Reference Book - the Encyclopedia of Homes, Carson Dunlop & Associates, Toronto, Ontario, 25th Ed., 2012, is a bound volume of more than 450 illustrated pages that assist home inspectors and home owners in the inspection and detection of problems on buildings. The text is intended as a reference guide to help building owners operate and maintain their home effectively. Field inspection worksheets are included at the back of the volume. Special Offer: For a 10% discount on any number of copies of the Home Reference Book purchased as a single order. Enter INSPECTAHRB in the order payment page "Promo/Redemption" space. InspectAPedia.com editor Daniel Friedman is a contributing author.

Or choose the The Home Reference eBook for PCs, Macs, Kindle, iPad, iPhone, or Android Smart Phones. Special Offer: For a 5% discount on any number of copies of the Home Reference eBook purchased as a single order. Enter INSPECTAEHRB in the order payment page "Promo/Redemption" space.


	InspectAPedia^®	InspectAPedia
	Free Encyclopedia of Building & Environmental Inspection, Testing, Diagnosis, Repair	Ask a Question or Search InspectAPedia