Austin – Improve Foundation Performance

EXPANSIVE CLAYS
Expansive Clays. Can’t live with them. Can’t live without them.
If you live in the Austin or the South Texas Area, you know the havoc these soils can wreak on a slab on grade foundation system. But do you know how simple it is to prevent clay soil slab damage while at the same time improving its performance potential?
To help lower the potential of future concrete foundation distress and residence interior/exterior brittle material cracking occurrences, a homeowner should consider implementing the following non-structural maintenance/code compliance guidance:
  • Maintain a uniform soil moisture content along and about the foundation system perimeter where it is reasonable to do so. The following Guidelines below may be followed:
  • Excessively wet foundation bearing soils can swell volumetrically causing ground supported foundation systems to displace vertically (“heave” or “settle”) upward or downward over time. Assure bearing depth soils near the foundation perimeter do not become excessively saturated. To the extent allowable, assure uniform bearing depth soil moisture content conditions along the foundation perimeter areas.
  • Excessively dry foundation bearing soils can shrink volumetrically causing ground supported foundation systems to displace vertically (“settle”) downward over time. Assure bearing depth soils near the foundation perimeter do not become excessively desiccated. To the extent allowable, assure uniform bearing depth soil moisture content conditions along the foundation perimeter areas.
  • The Post Tensioning Institute Publication “Design and Construction of Post Tensioned Slabs-on-Ground” states:
  • Watering should be done in a uniform, systematic manner as equally as possible on all sides of the foundation to keep the soil moist. Areas of the soil that do not have ground cover may require more moisture as they are more susceptible to evaporation.
  • During extreme hot & dry periods, close observations should be made around foundations to insure that adequate watering is being provided to keep soil from separating or pulling back from the foundation.
  • Assure any air conditioning condensate discharge lines direct condensate away from the foundation system perimeter to prevent localized foundation bearing soil saturation.
  • Assure any water heater TPRV discharge lines direct their liquid effluent away from the foundation system perimeter to prevent localized foundation bearing soil saturation.
  • Attempting to replace expected local climate precipitation by artificially imbibing moisture into the foundation bearing soils with appliances (example: soaker hose or irrigation system) may negatively impact the structural efficacy the foundation system. No known authoritative treatise or code based protocols exist which provide approved instructions for their safe, hazard free, long term use.
Austin – Improve Foundation Performance Austin Austin – Improve Foundation Performance- Improve Foundation Performance

Structural Engineer Inspection – Austin

Q. What is the standard, if any, for evaluating residential foundations in the Austin, Texas area?

A. Technically, none. However, in May 2009, the American Society of Civil Engineers (ASCE) adopted the “Guidelines for the Evaluation and Repair of Residential Foundationsâ€� version 2â€�. It is widely accepted by most practicing professionals as the “de facto” standard for evaluating residential foundation systems in the Austin, Texas area.

Q. What do mean by “de facto”?

A. To date, a method for evaluating residential foundations that combines the various civil, geotechnical, and structural evaluation aspects of residential foundation systems into one concise document geared for Texas soils has not been authored. With its wide acceptance and ongoing use by most professionals, the “Guidelines for the Evaluation and Repair of Residential Foundations� version 2� thus becomes an accepted structural inspection standard in Texas.

Q. Why was there a need to establish a standard for inspecting residential foundation systems in Texas (Austin)?

A. The need grew out of the response of many Section members to the Policy Advisory issued by the Texas Board of Professional Engineers (TBPE, Austin, Texas)  in 1998.

Q. What did the Policy Advisory address?

A. Residential foundation engineering. Many ASCE practitioners expressed the opinion that technical guidelines should more rightly be created by a technical society such as ASCE rather than by the TBPE. One goal of the guidelines has been to provide the TBPE with guidance in their evaluation of complaints brought against engineers practicing residential foundation engineering.  The Guidelines help to assure foundations are evaluated against a common standard.  In doing so, the same evaluation standard is applied to multiple foundation systems throughout Texas, including Austin.  This provides the end user (customer) of the engineering opinion an objective measure of the structural status (strength and performance) of a particular foundation system.  In other words, regardless of the size, geometry, or geographical location of the foundation system, the foundation evaluation findings can be relied upon because there is an “apples to apples” comparison between different foundations and the ASCE guidelines.

Q. Who wrote the guidelines?

A. Experienced engineers. Civil, structural, forensic, and other types of engineers. Several of theses engineers testified as experts in the Texas courts.

Q. How were the guidelines put together?

A. One committee and two subcommittees were formed to address the raised concerns. One subcommittee addressed “Recommended Practice for the Design of Residential Foundations�, and the other worked to develop “The Guidelines for the Evaluation and Repair of Residential Foundations�. The Residential Foundation Oversight (“Oversight�) Committee provided review guidance to the two previously mentioned subcommittees.

Q. Were the committee members licensed engineers?

A. Yes. The Oversight Committee and both subcommittees were composed entirely of ASCE members who were licensed engineers. Subcommittee membership was open to any Texas Section member who wished to participate. The dollar value of the professional services donated to the effort is conservatively estimated to exceed $1,000,000.

 

Q. Are the Guidelines mandatory or optional ?

A. The Guidelines are not intended to be Standards, but are guidelines only, reflecting the engineering opinions and practices of the committee members. They in no way replace the basic need for good engineering judgment based on appropriate education, experience, wisdom, and ethics in any particular engineering application. Thus, they are primarily suited as an aid for and use by engineers.

 

Q. What type of engineer can perform a residential foundation evaluation?

A. According to an advisory opinion (EAOR #16) issued by the Texas Board of Professional Engineers on 2-24-2006, “There is no requirement in the Texas Engineering Practice Act (the Act) to practice engineering only in the area that was tested for during the Principles and Practice examâ€�. And, “…the Texas Legislature has only identified the licensing of an engineer, not specific disciplinesâ€�. Finally, “…All engineers are required under the Act to practice only in their area(s) of competence…â€�

 

Structural Engineer Inspection – Austin

Structural Inspection Continuing Education Series: Does a standard Exist in Texas for Residential Foundation Structural Inspections?

The following Q & A is an excerpt from an interview with Jeff Lineberger, P. E., Principal Engineer, Lineberger Consulting Engineers, Inc. Mr. Lineberger has 30 years engineering experience both domestically and internationally. Mr. Lineberger practices civil/structural engineering throughout Texas, and testifies as an expert in both the Federal and Texas court systems.

Q. Is there a standard in Texas for evaluating residential foundations?

A. Technically, no. However, in May 2009, the American Society of Civil Engineers (ASCE) adopted the “Guidelines for the Evaluation and Repair of Residential Foundations” version 2”. It is widely accepted by most practicing professionals as the “de facto” standard for evaluating residential foundation systems.

Q. What do mean by “de facto”?

A. To date, a method for evaluating residential foundations that combines the various civil, geotechnical, and structural evaluation aspects of residential foundation systems into one concise document geared for Texas soils has not been authored. With its wide acceptance and ongoing use by most professionals, the “Guidelines for the Evaluation and Repair of Residential Foundations” version 2” thus becomes an accepted structural inspection standard in Texas.

Q. Why was there a need to establish a standard for inspecting residential foundation systems?

A. The need grew out of the response of many Section members to the Policy Advisory issued by the Texas Board of Professional Engineers (TBPE) in 1998.

Q. What did the Policy Advisory address?

A. Residential foundation engineering. Many ASCE practitioners expressed the opinion that technical guidelines should more rightly be created by a technical society such as ASCE rather than by the TBPE. One goal of the guidelines has been to provide the TBPE with guidance in their evaluation of complaints brought against engineers practicing residential foundation engineering.

Q. Who wrote the guidelines?

A. Experienced engineers. Civil, structural, forensic, and other types of engineers. Several of theses engineers testified as experts in the Texas courts.

Q. How were the guidelines put together?

A. One committee and two subcommittees were formed to address the raised concerns. One subcommittee addressed “Recommended Practice for the Design of Residential Foundations”, and the other worked to develop “The Guidelines for the Evaluation and Repair of Residential Foundations”. The Residential Foundation Oversight (“Oversight”) Committee provided review guidance to the two previously mentioned subcommittees.

Q. Were the committee members licensed engineers?

A. Yes. The Oversight Committee and both subcommittees were composed entirely of ASCE members who were licensed engineers. Subcommittee membership was open to any Texas Section member who wished to participate. The dollar value of the professional services donated to the effort is conservatively estimated to exceed $1,000,000.

 

Q. Are the Guidelines mandatory or optional ?

A. The Guidelines are not intended to be Standards, but are guidelines only, reflecting the engineering opinions and practices of the committee members. They in no way replace the basic need for good engineering judgment based on appropriate education, experience, wisdom, and ethics in any particular engineering application. Thus, they are primarily suited as an aid for and use by engineers.

 

Q. What type of engineer can perform a residential foundation evaluation?

A. According to an advisory opinion (EAOR #16) issued by the Texas Board of Professional Engineers on 2-24-2006, “There is no requirement in the Texas Engineering Practice Act (the Act) to practice engineering only in the area that was tested for during the Principles and Practice exam”. And, “…the Texas Legislature has only identified the licensing of an engineer, not specific disciplines”. Finally, “…All engineers are required under the Act to practice only in their area(s) of competence…”