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STRUCTURAL INSPECTIONS & DEFECTS

ADVANCED INSPECTION METHODS
AGE of a BUILDING - how to determine
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BASEMENT WATERPROOFING
BEST CONSTRUCTION PRACTICES GUIDE
BRICK FOUNDATIONS & WALLS
BRICK STRUCTURAL WALL Loose Bulged
BRICK WALL THERMAL EXPANSION CRACKS
BRICK VENEER WALL Loose, Bulged
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CHIMNEY INSPECTION DIAGNOSIS REPAIR
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EARTHQUAKE DAMAGED FOUNDATIONS

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More Information

Photograph of polyurethane foam being injected into a concrete foundation crack How to Repair Foundation Cracks Using Polyurethane Foam Injection
     

  • POLYURETHANE FOAM INJECTION - How to make a foundation crack repaior leakage seal using polyurethane foam
    • How to Stop Basement or Crawl Space Water Leakage Through Cracks
    • Guide to sealing foundation cracks using injectable foam
    • Foundation crack repair products, materials, where-to-buy sources, alternatives
    • List of Polyurethane Crack Sealants Products, Sources, Brands, Manufacturers
  • SLAB CRACK EVALUATION - home
  • SLAB CRACK REPAIR - home
    • CRACK REPAIR STANDARDS for FLOORS - separate article
    • CONTROL JOINT CRACKS in CONCRETE - separate article
    • POLYURETHANE FOAM INJECTION - separate article
    • SEAL CRACKS in CONCRETE, How To - separate article
    • SHRINKAGE CRACK REPAIR - separate article
    • SLAB CRACK EVALUATION - separate article
    • VERTICAL FOUNDATION MOVEMENT REPAIR - separate article
  • FOUNDATION REPAIR METHODS - separate article
  • Questions & Answers about foundation crack sealing procedures using injectable polyurethane foam
  • References

Click to Show or Hide Related Topics

  • FOUNDATION DAMAGE & REPAIR GUIDE - home
  • BUILDING SETTLEMENT
  • DEFECTS LIST - STRUCTURE, FOUNDATION
  • DISASTER BUILDING INSPECTION & REPAIR
  • EARTHQUAKE DAMAGED FOUNDATIONS
  • FLOOD DAMAGED FOUNDATIONS
  • FOUNDATION CONSTRUCTION TYPES
  • FOUNDATION CONTRACTORS, ENGINEERS
  • FOUNDATION CRACK EVALUATION
  • FOUNDATION DAMAGE REPORTS
  • FOUNDATION DAMAGE SEVERITY
  • FOUNDATION DRAINS / FRENCH DRAINS
  • FOUNDATION FAILURES by MOVEMENT TYPE
  • FOUNDATION FAILURES by TYPE & MATERIAL
  • FOUNDATION INSPECTION METHODS
  • FOUNDATION INSPECTION STANDARDS
  • FOUNDATION INSULATION OPTIONS
  • FOUNDATION MATERIALS, Age, Types
  • FOUNDATION MISSING INCOMPLETE
  • FOUNDATION MOVEMENT ACTIVE vs. STATIC
  • FOUNDATION REPAIR METHODS
  • FOUNDATION WATERPROOFING
  • FRAMING DAMAGE, INSPECTION, REPAIR - home
  • FROST HEAVES, FOUNDATION, SLAB
  • SINKHOLES, WARNING SIGNS
  • SINKING BUILDINGS
  • SITE FACTORS AFFECTING FOUNDATIONS
  • SLAB CRACK EVALUATION
  • SLAB CRACK REPAIR
  • WATER ENTRY in BUILDINGS
InspectAPedia tolerates no conflicts of interest. We have no relationship with advertisers, products, or services discussed at this website.

Foundation wall or slab crack repair using polyurethane foam injection: this article explains how to use injected polyurethane foam to repair a concrete basement (or crawl area) wall or slab crack in order to stop basement or crawl space water entry or air leakage.

Green links show where you are. © Copyright 2013 InspectAPedia.com, All Rights Reserved. Author Daniel Friedman.

How to Repair a Leaking Basement Foundation Crack by Polyurethane Foam Injection

Photograph of polyurethane foam being injected into a concrete foundation crack Aaron Kuertz, Applied Technologies

Also see How to Seal Cracks in Concrete for a description of various products and methods used to seal or repair cracks in poured concrete walls, foundations, floors, & slabs. and see FOUNDATION REPAIR METHODS for a more extensive discussion of types of foundation damage and how it is repaired. [Photograph of this foundation crack repair process using foam injection, courtesy of Applied Technologies]

A variety of site conditions can lead to cracks in a concrete or other masonry foundation wall. Speaking generally, foundations may be damaged and cracks may appear from innocent causes unlikely to affect the structure such as shrinkage cracks, initial settlement, or from potentially more serious causes such as ongoing settlement, unusual pressures or loading, or from improper construction.

Before repairing a foundation crack by sealing it against water entry, it is important to diagnose the cause of the crack and its effects on the building structure. If there is an underlying ongoing problem causing foundation movement or damage, that problem should be corrected.

Cracks in concrete walls that are larger than 1/4", cracks which are increasing in size, or cracks which are indicative of foundation movement should be evaluated by a professional. The diagnosis and evaluation of foundation cracks and structural foundation damage and repair methods are discussed at FOUNDATION REPAIR METHODS

Shrinkage cracks and in some cases other foundation cracks such as those caused by minor initial settlement might not be a structural concern but may still form an opening leading to water leaks into the building. Concrete shrinks as a natural process of it curing. This shrinkage causes the concrete to develop stresses and to relieve it, the basement wall cracks.

Photograph of a classic shrinkage crack in poured concrete wall.

Concrete shrinkage cracks are a common condition in a concrete foundation [or also in concrete slabs unless control joints were used in the wall or floor design] and occur when concrete shrinks as it dries and cures.

Shrinkage cracks are easy to recognize and to distinguish from cracks that occur later in the life of a foundation because [usually] the cracks are not continuous and tend to extend in a very irregular line through the concrete (as shown in the photo) range in length from a few inches to the entire height of the concrete wall, extending from wall top to bottom.

Concrete shrinkage cracks virtually always extend through the full thickness of the foundation wall, which means they can provide a ready path for water entry into the building.

Common areas for a shrinkage concrete crack to develop are under a basement window, above a doorway in the middle of a long wall or where the foundation "steps down." Shrinkage cracks also often occur near the middle of a large poured concrete wall [or floor] if no control joints were used. [Concrete control joints are very often omitted in residential construction. Shrinkage cracks and how to recognize and diagnose them are discussed further at SHRINKAGE vs EXPANSION vs SETTLEMENT.

Once concrete cracks in a basement or crawl space wall or floor slab, it is possible for water to leak into a building through the crack. There are several ways to repair a basement crack leak. An easy, quick, and effective measure to stop basement or crawl space water entry through a foundation crack is to perform an injection of polyurethane foam into the basement crack. [Also be sure to find and fix the sources of water outside.]

Photograph of polyurethane foam foundation crack repair kit

Both commercial and home-owner "do it yourself" kits and equipment are available to seal foundation cracks using this foam method. [Photograph of this foundation crack repair kit, courtesy of Applied Technologies].

Polyurethane foams are injected into the basement crack in a liquid form. This allows a gentle and slow filling process of the basement crack that will completely fill the crack. After a few minutes the polyurethane will begin to react with the water in the crack to begin foaming. Water is actually the catalyst that converts the liquid polyurethane into foam. This foaming action increases the volume of the polyurethane up to 30 times its liquid form.

As the polyurethane foam expands it fills the basement crack from bottom to top and front to back. The finished foam will be a closed cell structure that will not allow water to leak into the basement crack. In fact, if there are any voids in the soil outside of the basement- such as under a rock or if the foundation is backfilled with gravel-the polyurethane foam will expand and extend out into the void.

The polyurethane foam forms a strong bond to the concrete. This bond will be able to withstand the hydrostatic pressure that may develop from high subsurface water levels. High underground or "subsurface" water levels are typically caused by heavy rains and most-often by failure to direct roof runoff or nearby surface runoff away from the building.

This concrete crack repair process using polyurethane injection is likely to be more successful and more durable than other crack patching methods. Surface patching of the crack is just that. Only the inside of the basement wall is covered by a repair. Chiseling out the crack and filling it with hydraulic cement only fills a portion of the crack.

Water can still enter the basement crack and will eventually force out the patch or hydraulic cement. [Forces that tend to cause separation of poorly-bonded concrete surface patches include the molecular action of crystallizing mineral salts left behind as moisture passes through the masonry wall.]

Basement crack injection is a quick repair process that stops water leaks. The technician does not have to drill into the concrete to do it. For this reason the basement crack repair is a clean process. The technician will attach ports to the surface of the basement crack that allow the liquid polyurethane to enter the basement wall and stop the leak.

Once the basement wall crack is completed, water will not be able to leak into the basement. Now the homeowner's possessions will be safe. As will any insulation on the basement walls, the drywall or the framing used to finish the basement.

List of Polyurethane Crack Sealants Products, Sources, Brands, Manufacturers

  • Applied Technologies polyurethane crack sealant: the foam sealant discussed in the article above as well as other foundation crack repair products are available from Applied Technologies and include a polyurethane foam used to seal leaky basement cracks (this is not a structural repair it's a waterproofing measure). The company sells other foundation repair products (dowel rod epoxy) as well as foundation and basement waterproofing, drainage, and damp proofing products as well. 1-877-277-5948, 513-939-3767 or Fax: (513) 939-3787. Website: http://www.appliedtechnologies.com
  • Crack-Pac® Flex-H2O™ Polyurethane Crack Sealer, suitable for sealing cracks from 1/32" to 1/4" in width in concrete and solid masonry.
    Quoting: Crack-Pac® Flex-H2O™ is a high solids hydrophobic polyurethane injection resin designed to seal leaking cracks, voids or fractures in concrete or solid masonry. The polyurethane is packaged in the cartridge and an accelerator is packaged in the nozzle. When the two are combined in the cartridge and mixed, the result is a low viscosity, water activated polyurethane. When the resin encounters water as it is injected into the crack, it becomes an expanding foam that provides a flexible seal in leaking and non-leaking cracks. This product is produced and sold by Simpson StrongTie. Simpson Strong-Tie Company, Inc.,
    5956 W. Las Positas Blvd. Pleasanton, CA 94588. Website: http://www.strongtie.com/products/anchorsystems
    /adhesives/crackrepair/crack_pac_flex_h20.html
  • Quickcrete 862018 10-oz Polyurethane Mortar Crack Sealant, Tel: 1-800-282-5828, Website: http://www.quikrete.com/,
    Quoting: Mortar repair polyurethane, commercial grade interior/exterior Size Oz=10 Color=Gray High performance, construction grade sealant waterproofs, seals and tuck-points damaged mortar joints. Textured one-component, fast-curing, flexible material providing a durable elastic bond. Adheres to concrete, masonry, stucco, pre-painted metal, glass,plywood, aluminum, steel and many plastics and composites. Can be applied to approximately 12 lineal feet in a 3/8" bead.
  • QUIKRETE® Polyurethane Concrete Crack Sealant (No. 8620-17) is a high performance, construction grade polyurethane sealant permanently seals and waterproofs cracks in concrete, masonry and stucco surfaces. Contact information shown just above.
  • Loctite® PL® S10 Polyurethane concrete crack & masonry sealant, Loctite Corporation, Loctite® Brand - Consumer Products Henkel Corporation 26235 First Street Westlake Ohio 44145, Tel: 800-624-7767.
    Quoting: Loctite® PL® S10 Polyurethane Concrete Crack & Masonry Sealant is a premium quality, commercial grade sealant developed especially for forming permanent, water and weatherproof seals in all exterior gaps and joints. This sealant is elastic and remains flexible to expand and contract with construction material movement to protect and retain the original seal. Loctite® PL® S10 Polyurethane Concrete Crack & Masonry does not require a primer for concrete, brick, stone or masonry and resists deterioration from weather, stress or movement.
  • Loctite® PL® S20 Polyurethane self-leveling concrete crack sealant, Loctite Corporation, Loctite® Brand - Consumer Products Henkel Corporation 26235 First Street Westlake Ohio 44145, Tel: 800-624-7767.
    Quoting: Loctite® PL® S20 Polyurethane Self-Leveling Concrete Crack Sealant is a professional grade sealant for concrete. It is a one component, polyurethane, self-leveling sealant for contraction / expansion joints and cracks in concrete floors and decks. It cures in place to form a highly resilient and abrasion resistant seal, which resists deterioration caused by weather, stress, movement, traffic and water. Its abrasion and tear resistance makes it ideally suited for applications exposed to pedestrian and vehicular traffic.
  • Mar-Flex Polyurethane Concrete Crack Repair Kit, Tel: 800-498-1411, Website: www.mar-flex.com
    Quoting: Low-pressure injection and repair of approximately 8-10 lineal feet. Contains the following; (1 jar 8oz.) Mar-flex Crack Seal (1 jar 8oz.) Port Adhesive (2) Wooden Sticks (12) Surface Ports and Caps (2 Cartridges) Mar-flex Injection Polyurethane/Epoxy Resin 1:1 (2) 3/8" :24 Mixing Nozzles (1) Injection Hose Assembly with plastic shut-off valve (2 pair) Latex Gloves (1) Plastic Trowel (1) Wire Brush (1) Drop Cloth (1) Complete Instructional DVD. The company also offers low-viscosity creack filler that can be injected into both dry and damp cracks and a "Seal & Peel" crack repair kit.
  • RadonSeal D-I-Y two-component polyurethane or epoxy crack repair kits. Radon Mitigation & Concrete Waterproofing Co., Novion Inc., 18 L'Hermitage Drive, Shelton, CT 06484 USA. Website: http://www.radonseal.com/,
    Quoting: Each D-I-Y kit is able to repair up to 10 linear feet of cracks in poured concrete walls from hairline to 1/2" wide. You can choose to inject either expanding polyurethane or epoxy. Since most cracks are non-structural, we use polyurethane on almost all cracks because it works inside wet cracks. You also have the choice of the standard epoxy surface sealer when the wall will be framed in or if appearance matters, the Easy-Peel surface sealer which can be easily removed after the repair. If you have more than 20 linear feet of cracks, it is more economical to purchase our Professional Foundation Crack Repair Toolkit. These kits include a professional caulking gun, which makes the job even easier. If it is a smaller project, like filling the voids around pipes or leaking form ties, use our PipeTite Gap Filler Kit.

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Technical Reviewers & References

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

  • Thanks to Aaron Kuertz author and contributor of this article on foundation crack repair using polyurethane foam, and foundation crack repair materials (updated 06/02/2009)
    Aaron Kuertz aaronk@appliedtechnologies.com, is with Applied Technologies in Fairfield, Ohio. The foam sealant discussed here as well as other foundation crack repair products are available from Applied Technologies and include a polyurethane foam used to seal leaky basement cracks (this is not a structural repair it's a waterproofing measure). The company sells other foundation repair products (dowel rod epoxy) as well as foundation and basement waterproofing, drainage, and damp proofing products as well. 1-877-277-5948, 513-939-3767 or Fax: (513) 939-3787

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.
  • Home Reference Book - Carson DunlopThe 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.
  • Best Practices Guide to Residential Construction, by Steven Bliss. John Wiley & Sons, 2006. ISBN-10: 0471648361, ISBN-13: 978-0471648369, Hardcover: 320 pages, available from Amazon.com and also Wiley.com. See our book review of this publication.
  • Decks and Porches, the JLC Guide to, Best Practices for Outdoor Spaces, Steve Bliss (Editor), The Journal of Light Construction, Williston VT, 2010 ISBN 10: 1-928580-42-4, ISBN 13: 978-1-928580-42-3, available from Amazon.com
  • Building Pathology, Deterioration, Diagnostics, and Intervention, Samuel Y. Harris, P.E., AIA, Esq., ISBN 0-471-33172-4, John Wiley & Sons, 2001 [General building science-DF] ISBN-10: 0471331724 ISBN-13: 978-0471331728
  • Building Pathology: Principles and Practice, David Watt, Wiley-Blackwell; 2 edition (March 7, 2008) ISBN-10: 1405161035 ISBN-13: 978-1405161039
  • Diagnosing & Repairing House Structure Problems, Edgar O. Seaquist, McGraw Hill, 1980 ISBN 0-07-056013-7 (obsolete, incomplete, missing most diagnosis steps, but very good reading; out of print but used copies are available at Amazon.com, and reprints are available from some inspection tool suppliers). Ed Seaquist was among the first speakers invited to a series of educational conferences organized by D Friedman for ASHI, the American Society of Home Inspectors, where the topic of inspecting the in-service condition of building structures was first addressed.
  • Design of Wood Structures - ASD, Donald E. Breyer, Kenneth Fridley, Kelly Cobeen, David Pollock, McGraw Hill, 2003, ISBN-10: 0071379320, ISBN-13: 978-0071379328
    This book is an update of a long-established text dating from at least 1988 (DJF); Quoting:
    This book is gives a good grasp of seismic design for wood structures. Many of the examples especially near the end are good practice for the California PE Special Seismic Exam design questions. It gives a good grasp of how seismic forces move through a building and how to calculate those forces at various locations. THE CLASSIC TEXT ON WOOD DESIGN UPDATED TO INCLUDE THE LATEST CODES AND DATA. Reflects the most recent provisions of the 2003 International Building Code and 2001 National Design Specification for Wood Construction. Continuing the sterling standard set by earlier editions, this indispensable reference clearly explains the best wood design techniques for the safe handling of gravity and lateral loads. Carefully revised and updated to include the new 2003 International Building Code, ASCE 7-02 Minimum Design Loads for Buildings and Other Structures, the 2001 National Design Specification for Wood Construction, and the most recent Allowable Stress Design.
  • Building Failures, Diagnosis & Avoidance, 2d Ed., W.H. Ransom, E.& F. Spon, New York, 1987 ISBN 0-419-14270-3
  • Domestic Building Surveys, Andrew R. Williams, Kindle book, Amazon.com
  • Defects and Deterioration in Buildings: A Practical Guide to the Science and Technology of Material Failure, Barry Richardson, Spon Press; 2d Ed (2001), ISBN-10: 041925210X, ISBN-13: 978-0419252108. Quoting:
    A professional reference designed to assist surveyors, engineers, architects and contractors in diagnosing existing problems and avoiding them in new buildings. Fully revised and updated, this edition, in new clearer format, covers developments in building defects, and problems such as sick building syndrome. Well liked for its mixture of theory and practice the new edition will complement Hinks and Cook's student textbook on defects at the practitioner level.
  • Guide to Domestic Building Surveys, Jack Bower, Butterworth Architecture, London, 1988, ISBN 0-408-50000 X
  • "Avoiding Foundation Failures," Robert Marshall, Journal of Light Construction, July, 1996 (Highly recommend this article-DF)
  • "A Foundation for Unstable Soils," Harris Hyman, P.E., Journal of Light Construction, May 1995
  • "Backfilling Basics," Buck Bartley, Journal of Light Construction, October 1994
  • "Inspecting Block Foundations," Donald V. Cohen, P.E., ASHI Reporter, December 1998. This article in turn cites the Fine Homebuilding article noted below.
  • "When Block Foundations go Bad," Fine Homebuilding, June/July 1998
  • Historic Preservation Technology: A Primer, Robert A. Young, Wiley (March 21, 2008) ISBN-10: 0471788368 ISBN-13: 978-0471788362
  • Log Homes: Log Home Design, U.S. Department of Energy
  • Quality Standards for the Professional Remodeling Industry, National Association of Home Builders Remodelers Council, NAHB Research Foundation, 1987.
  • Quality Standards for the Professional Remodeler, N.U. Ahmed, # Home Builder Pr (February 1991), ISBN-10: 0867183594, ISBN-13: 978-0867183597
  • Slab on Grade Foundation Moisture and Air Leakage, U.S. Department of Energy
  • More Straw Bale Building: A Complete Guide to Designing and Building with Straw (Mother Earth News Wiser Living Series), Chris Magwood, Peter Mack, New Society Publishers (February 1, 2005), ISBN-10: 0865715181 ISBN-13: 978-0865715189 - Quoting:
    Straw bale houses are easy to build, affordable, super energy efficient, environmentally friendly, attractive, and can be designed to match the builder’s personal space needs, esthetics and budget. Despite mushrooming interest in the technique, however, most straw bale books focus on “selling” the dream of straw bale building, but don’t adequately address the most critical issues faced by bale house builders. Moreover, since many developments in this field are recent, few books are completely up to date with the latest techniques.
    More Straw Bale Building is designed to fill this gap. A completely rewritten edition of the 20,000-copy best--selling original, it leads the potential builder through the entire process of building a bale structure, tackling all the practical issues: finding and choosing bales; developing sound building plans; roofing; electrical, plumbing, and heating systems; building code compliance; and special concerns for builders in northern climates.
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