Repair Methods for Bulged or Cracked Foundation Walls

BULGED FOUNDATION REPAIR METHODS - How to Repair Bulged, Cracked Building Foundations using pilasters, steel reinforcement, foundation anchors, sister walls, or wall reconstruction & Photographs and drawings of repair methods used for foundation wall cracks and bulges
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Bulged foundation wall repair methods: This article explains how to Repair Bulged, Cracked Building Foundations using pilasters, steel reinforcement, foundation anchors, sister walls, or wall reconstruction methods. In this masonry foundation or wall repair article series we explain how it is possible to be confident about the cause of and repair for foundation damage, and we describe various methods used to repair cracked or bulged, bowed or in some cases leaning or tipped foundation walls. The photograph at the top of this page shows a concrete block wall which has bulged and is in danger of collapse due to earth pressure from outside. The photo above shows a foundation wall reconstruction in process for a poured concrete foundation wall that settled and cracked at the time of construction.

A Guide to Repair Methods for Bulged Foundation Walls

Sketch of a method for repairing a bulged concrete block wall (C) Daniel Friedman

Here we illustrate and describe several methods used to stiffen or reinforce bulging foundation walls against further movement.

The motive for a decision to reinforce a building foundation rather than rebuild it can be easily understood by noticing the difference in cost between bolting a few vertical steel beams to a building or building a pilaster and the cost to add temporary support to the floors above, remove an existing foundation, and rebuild a new one in its place.

However the decision to support or reinforce a foundation wall versus rebuilding it is often made by the wall itself. If the amount of bulge or bow is sufficiently severe the wall needs to be rebuilt.

If the underlying source of wall damage cannot be reliably addressed without excavating outside to add drainage and perhaps water proofing, there is additional motivation to perform a more costly repair.

The foundation bulge or lean repair methods listed below are roughly in order of their most common appearance in residential buildings. The sketch shown here describes application of a steel I-beam against a masonry block wall for reinforcement. More details are given below.

Guide to Using Pilasters for Repair of Foundation Wall Bulge, Cracks, Movement

The Carson Dunlop sketch at above right shows how a pilaster may appear in a building for a different reason than an attempt to stiffen a bulging foundation wall. In this case the pilaster is supporting a beam placed as a girder to support the floor that will be constructed above. So don't assume just because you see a pilaster that it was built to address a foundation damage problem.

Pilasters may be constructed against the existing foundation wall(s) to add stability and resist further movement. A pilaster is a masonry column or short wall which is constructed butting against the original wall at right angles. In this photo the masonry block pilaster is itself damaged and spalling. Additional repairs and steps to direct water away from this foundation wall are still needed.

Guide to Using Reinforcing Steel I-Beams for Repair of Foundation Wall Bulge, Cracks, Movement

Photograph of Steel I-beams or U-channel beams placed against the bulged wall

Steel I-beams or U-channel beams may be placed against the bulged wall, anchored at their bottom to the floor slab and at their top to building floor framing. The beam is placed with its side against the most-inward-protruding portion of the wall.

When you click on the photos below you'll see how the installer used a simple wood cross-bridge between the joists of the floor above to hold the top of the "I" beam in place against the foundation wall.

Often the bottom of the vertical I-beam is secured by breaking a hole into the concrete floor slab where the bottom of the I-beam is cemented in place.

Because the total bulge in the concrete block wall above was minor, and because analysis of the wall gave convincing evidence that the only wall damage and movement had occured at time of construction, during backfill, the contractor repaired the wall by adding safety-reinforcement: steel I-beam pilasters secured to the floor structure at the wall top and let into the concrete slab at the wall bottom. The i-beam contacts the concrete block wall only at its most inward-bulged point. [Click these or any image at InspectApedia to see an enlarged, detailed version.]

Example of Using Foundation Anchors for Repair of Foundation Wall Bulge, Cracks, Movement

Foundation Anchors may be used to stabilize a foundation wall which is not badly damaged. This approach uses horizontal driven pins to anchor the wall to the surrounding soil and resist resist further movement.

Special products are available which employ an expanding soil anchor at the outside end of the horizontal pin.

In this photograph we show a rectangular steel plate and just the end of a threaded steel rod which is all that one can see of the foundation anchor which had been driven through the foundation wall and into the surrounding soil.

Guide to Using Interior or Exterior Reinforcing Sister Walls for Repair of Foundation Wall Bulge, Cracks, Movement

An inside or outside foundation-reinforcing wall may be constructed against the bulged foundation wall. Unless the outside cause of bulging (such as water or frost) is also corrected, we are doubtful about the durability of this approach. In this photograph there had been a history of water entry and foundation wall cracks and movement at the front of this office building built with a portion of its foundation wall sitting on sloped bedrock.

The contractor built a reinforced concrete block against the damaged foundation wall, an effort which was largely successful at reducing most, but not all of the water entry (and mold) in the building. Simple measures outside to properly handle roof runoff by directing it against the foundation, and normal gutter maintenance, would help considerably in drying out this area. The sketch describes application of a reinforced concrete wall on the exterior of a building foundation.

Using Cables for Repair of Foundation Wall Bulge, Cracks, Movement

Steel tension cables + stars (reinforcing plates) are sometimes used to anchor the wall to the surrounding soil and resist further movement but more normally this approach is used to strengthen and cross-tie above-ground walls in masonry buildings. It's common to see these outside reinforcing plates on pre-1900 multi-story brick buildings which no longer rely just on floor framing to tie opposing masonry walls together.

Reconstruction as a Repair of Foundation Wall Bulge, Cracks, Movement

Reconstruction of the entire foundation wall is the repair usually called-for by masons and while probably the most-costly, is often the most effective repair method since it permits installation of drainage around the wall exterior as part of the procedure:

excavation and reconstruction of a near-failing or failed foundation wall may possibly include in the new wall, additional reinforcement over the original design and with additional foundation and site drainage.

In the photo shown here the rear and a portion of the rear right masonry block foundation walls had to be rebuilt after the foundation began to collapse during a period of heavy rain.

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Technical Reviewers & References

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

Authority

Opinions herein are the responsibility of the author. Most of this material has been subject to ongoing peer review but is without any professional engineering analysis. Home inspections may include the discovery of defects involving life, safety, and significant costs. Home inspectors who are not both qualified and certain of the authoritative basis of their conclusions should obtain their own expert advice from qualified experts.

This work is also based on the author's construction & inspection experience, training, research, and survey of material from ASHI, and from N. Becker, R. Burgess, J. Bower, D. Breyer, A. Carson, J. Cox, A. Daniel, M. Lennon, R. Peterson, J. Prendergast, W. Ransom, D. Rathburn, E. Rawlins, E. Seaquist, and D. Wickersheimer. Some useful citations are at the end of this paper.
"Concrete Slab Finishes and the Use of the F-number System", Matthew Stuart, P.E., S.E., F.ASCE, online course at www.pdhonline.org/courses/s130/s130.htm
Sal Alfano - Editor, Journal of Light Construction*
Thanks to Alan Carson, Carson Dunlop, Associates, Toronto, for technical critique and some of the foundation inspection photographs cited in these articles.
Mark Cramer Inspection Services Mark Cramer, Tampa Florida, Mr. Cramer is a past president of ASHI, the American Society of Home Inspectors and is a Florida home inspector and home inspection educator. Mr. Cramer serves on the ASHI Home Inspection Standards. Contact Mark Cramer at: 727-595-4211 mark@BestTampaInspector.com
John Cranor is an ASHI member and a home inspector (The House Whisperer) is located in Glen Allen, VA 23060. He is also a contributor to InspectApedia.com in several technical areas such as plumbing and appliances (dryer vents). Contact Mr. Cranor at 804-747-7747 or by Email: johncranor@verizon.net
Carson, Dunlop & Associates Ltd., 120 Carlton Street Suite 407, Toronto ON M5A 4K2. (416) 964-9415 1-800-268-7070 info@carsondunlop.com. The firm provides professional home inspection services & home inspection education & publications. Alan Carson is a past president of ASHI, the American Society of Home Inspectors. Thanks to Alan Carson and Bob Dunlop, for permission for InspectAPedia to use text excerpts from The Home Reference Book & illustrations from The Illustrated Home. Carson Dunlop Associates' provides:
- Commercial Building Inspection Courses - protocol ASTM Standard E 2018-08 for Property Condition Assessments
- Home Inspection Education Courses including home study & live classes at eleven colleges & universities.
- Home Inspection Education Home Study Courses - ASHI@Home Training 10-course program.
  Special Offer: Carson Dunlop Associates offers InspectAPedia readers in the U.S.A. a 5% discount on these courses: Enter INSPECTAHITP in the order payment page "Promo/Redemption" space. InspectAPedia.com editor Daniel Friedman is a contributing author.
- The Home Reference Book, a reference & inspection report product for building owners & inspectors.
  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.
- The Home Reference eBook, an electronic version for PCs, the iPad, iPhone, & 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.
- The Illustrated Home illustrates construction details and building components, a reference for owners & inspectors.
  Special Offer: For a 5% discount on any number of copies of the Illustrated Home purchased as a single order Enter INSPECTAILL in the order payment page "Promo/Redemption" space.
- The Horizon Software System manages business operations,scheduling, & inspection report writing using Carson Dunlop's knowledge base & color images. The Horizon system runs on always-available cloud-based software for office computers, laptops, tablets, iPad, Android, & other smartphones.
A.B. Chance foundation repair systems, helical piers, foundation repairs www.abchance.com
Dwyer of Florida, supplier of Helical Piles, foundation repair, and concrete restoration in Florida, exclusive dealer for Magnum piering. This company provides helical piles, foundation settlement repair, concrete restoration, shotcrete, pressure grouting, and slabjacking for residential and commercial buildings. 1-866-900-PIER www.dwyerflorida.com
Terry Carson - ASHI
Mark Cramer - ASHI
JD Grewell, ASHI
Duncan Hannay - ASHI, P.E. *
Bob Klewitz, M.S.C.E., P.E. - ASHI
Ken Kruger, P.E., AIA - ASHI
Aaron Kuertz aaronk@appliedtechnologies.com, with Applied Technologies regarding polyurethane foam sealant as other foundation crack repair product - 05/30/2007
Bob Peterson, Magnum Piering - 800-771-7437 - FL*
Arlene Puentes, ASHI, October Home Inspections - (845) 216-7833 - Kingston NY
Greg Robi, Magnum Piering - 800-822-7437 - National*
Dave Rathbun, P.E. - Geotech Engineering - 904-622-2424 FL*
Ed Seaquist, P.E., SIE Assoc. - 301-269-1450 - National
Dave Wickersheimer, P.E. R.A. - IL, professor, school of structures division, UIUC - University of Illinois at Urbana-Champaign School of Architecture. Professor Wickersheimer specializes in structural failure investigation and repair for wood and masonry construction. * Mr. Wickersheimer's engineering consulting service can be contacted at HDC Wickersheimer Engineering Services. (3/2010)
*These reviewers have not returned comment 6/95

NOTE: Journal of Light Construction articles are available on CD ROM from the Journal of Light Construction, www.bginet.com, 802-434-4747

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
Avongard foundation crack progress chart for structural crack monitoring
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
Construction Drawings and Details, Rosemary Kilmer
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
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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.

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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
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