Development of a Methodology for the Visual Inspection of Engineered Wood Products and Metal Hangers in Residential Construction

Abstract:

This paper presents the development of a visual inspection methodology for engineered wood products that are commonly used in residential construction in the USA. Engineered wood products include wood composite structural elements such as I-joists, oriented strand board, and structural composite lumber products, and metal plate connected wood trusses. Due to the proprietary nature of wood composite engineered products, there are no uniform standards between different manufacturers for installation and use. If improper installation methods are used, engineered wood products may not be able to safely carry design loads. Improper use or modifications constitute prescriptive code violations. Construction errors that result from the unique installation requirements demonstrate the need for specific inspection methods to detect installation errors early in the construction process. The goal of this research is to develop an expert-validated visual inspection methodology, associated knowledge base, and software application for selected engineered wood products and hanger hardware for non-compliance at the pre-drywall stage of new residential construction. A modified Delphi method was used to solicit and refine inspection methods from subject matter experts. Based on these results, an inspection method and computer software application were developed. The method establishes a systematic expert-validated inspection procedure that identifies known high-risk areas for installation problems for engineered wood products. The software contains the instructions for implementing the inspection method, a reference library of authoritative installation guidelines and illustrations, the ability to document observed defects, and a vehicle to create a report. The experts validated the method and software application, and confirmed the usefulness for detecting construction errors.

• Periodical: Advanced Materials Research (Volume 778)
• Pages: 342-349
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.778.342
• Online since: September 2013
• Authors: Joseph R. Loferski, John C. Bouldin, Daniel P. Hindman
• Keywords: Construction, Engineered Wood Products, I-Joist, Inspection, Joist Hangers, Metal Plate Connected Wood Truss, Methodology, Truss, Wood

References

[1] NAHB, Wood Products Used in Residential Construction. National Association of Home Builders Research Center, Upper Marlboro, MD (2008).

[2] ANSI/TPI (2008). National Design Standard for Metal Plate Connected Wood Truss Construction. Truss Plate Institute, Alexandria, VA, (2008).

[3] APA (2010). A Glossary of Engineered Wood Terms. APA – The Engineered Wood Association, Tacoma, WA, 2010. Retrieved 2010 from http: /www. apawood. org/level_b. cfm?content=srv_med_new_bkgd_gloss.

[4] J. C. Bouldin, Methodology for the Visual Inspection of Selected Engineered Wood Products and Connector Hardware for Prescriptive Non-Compliance at the Pre-Drywall Stage of Residential Construction. (Doctoral dissertation). Virginia Polytechnic Institute and State University, Blacksburg, VA, (2011).

[5] G. C. Foliente, R. H. Leicester, C. Wang, C. Mackenzie, I. Cole, Durability Design for Wood Construction. Forest Products Journal, Vol. 52, No. 1 (2002). Retrieved 2010 from Compendex database.

[6] ASTM, ASTM D9 – 2005 Terminology Relating to Wood and Wood-Based Products. ASTM International, West Conshohocken, PA, (2005).

DOI: 10.1520/jai12952

[7] ASTM, ASTM D 5055, Standard Specification for Establishing and Monitoring Structural Capacities of Prefabricated Wood I-Joists. ASTM International, West Conshohocken, PA, (2002).

DOI: 10.1520/d5055-12

[8] EWPA, Product Definitions, Engineered Wood Products Association, Madison, WI, 2010. Retrieved 2010 from http: /www. ewpa. com/definitions. php.

[9] BCSI, Building Component Safety Information: Guide to Good Practice for Handling, Installing, Restraining & Bracing of Metal Plate Connected Wood Trusses. Wood Truss Council of America, Madison, WI, and Truss Plate Institute, Alexandria, VA, (2008).

[10] ICC, International Residential Code for One- and Two- Family Dwellings Code and Commentary. International Code Council, Washington, DC, (2010).

[11] B. A. Graybeal, B. M. Phares, D. D. Rolander, M. Moore, G. Washer, Visual Inspection of Highway Bridges. Journal of Nondestructive Evaluation, Vol. 21, No. 3 (2002). Retrieved from Compendex database.

DOI: 10.1023/a:1022508121821

[12] OSHA, Field Operations Manual, Occupational Safety and Health Administration, US Department of Labor, Washington, DC, (2009).

[13] C. A. Anderson, F. Woeste, J. R. Loferski, (2003). Manual for the Inspection of Residential Wood Decks and Balconies. Forest Products Center, Madison, WI, (2003).

[14] H. Abdul-Rahman, Capturing the Cost of Quality Failures in Civil Engineering. The International Journal of Quality & Reliability Management. Bradford (1993) Vol. 10, No. 3 (1993) 20. Retrieved March 26, 2009 from ProQuest database.

DOI: 10.1108/02656719310037956

[15] A. Atkinson, Human Error in the Management of Building Projects, Construction Management and Economics. Vol. 16, No. 3 (1998) 339-349. Retrieved January 12, 2010 from Compendex database.

DOI: 10.1080/014461998372367

[16] J. A. Kuprenas, Influence of Quality on Construction Costs. AACE International Transactions, Morgantown (2008) CS51. Retrieved 2010 from ProQuest database.

[17] G. J. Skulmoski, F. T. Hartman, J. Krahn, The Delphi Method for Graduate Research. Journal of Information Technology Education, Vol. 6 (2007). Retrieved June 20, 2011 from Compendex database.

[18] HomeGauge, HomeGauge Version 4 Inspection Reporting Software. SHGI Corporation, Asheville, NC, (2010).