Testing Program of Micro-Drilling for Wood Damage Assessment

Experts test the effectiveness of micro-drilling for wood beam structural damage assessment

POST a QUESTION or COMMENT about methods used in testing structural wood members for damage or decay & the role of micro-drilling tests for in-situ evaluation of structural wood beams, timbers, or other framing members in buildings..

Testing program for assessing the effectiveness of micro-drilling used to determine the soundness of wood structural members:

This article describes the Incodo testing program used to study the reliability of micro-drilling in the measurement of the condition of wood timbers, beams, studs, etc.

This article series describes the various methods used to test & evaluate the structural integrity of wood-framed buildings. The original authors, Probett et als., propose a technique to provide objective pass-fail data on the condition of in-situ but suspect structural wood using micro drilling to examine wood density.

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Incodo Testing Program of Micro-Drilling for Wood Assessment

Paul Probett, Clinton Craig, Blake Probett, Incodo Forensic Building Specialists [1]

This article series on methods for assessing structural wood rot & damage is adapted & expanded from the author's "An Introduction to Micro-Drilling Technology for N. Z. Structural Timber Assessment" and is used with permission. We [DF] have added comments, some illustrations, and additional article citations.

At the references section we include a link to the original article as well as contact information for the authors and Incodo Ltd., a Tauranga, New Zealand forensic engineering firm.

[Click to enlarge any image or illustration]

Our discussion of micro-drilling is divided into three segments.

WOOD BEAM MICRO-DRILLING ASSESSMENT - Incodo study of microdrilling for wood structure assessment
WOOD BEAM MICRO-DRILLING PROCEDURES - Details of how micro drilling is used to assess wood structural member condition
WOOD BEAM MICRO-DRILLING EFFECTIVENESS - Micro-Drilling: Resistance drill Methods for Wood Structural Member Assessment. Incodo Testing Program of Micro-Drilling for Wood Assessment

Description of the Incodo Testing Program for Micro-Drilling of Wood Structural Beams & Timbers

Phase 1: Initial set up (completed)

Determining consistency of results using sound timber and establishing preliminary variable settings for software to determine Pass/Warning/Fail, Quality Infraction levels and identification of decay type voids.

Phase 2: Site testing and integration into report template (completed)

Initial site testing on buildings with wall framing exposed as part of remediation or demolition works. Three buildings – all in Auckland
Adjustment of settings for onboard software.

Build larger database of sound timber graphic levels to use as controls / base levels.

Phase 3: Outside consultant and further field testing (completed but ongoing consultation)

Consult ex FRI staff and engineers as to draft reports and use of terms.
Further testing on variety of common (and uncommon timbers incl. Matai, Pinus Syl. (Aus plantation), Pinus Rad. poles, Jarrah utility poles etc.

Determine further testing requirements.

Phase 4: Effect of moisture on consistency and reliability of test results (Completed – report at draft stage as at 05/12)

Assessment of impact of varied moisture levels on microdrilling results.

Undertake in-house testing using resistance moisture meter, H3.1 framing (to ensure no internal decay to skew results), Contherm drying oven, etc. Limited to 4 samples dried from 88-100%+MC to 12-14% Results (currently being tabulated)

Preliminary indications are that moisture level effects are limited and do not impact on micro-drilling assessments sufficiently to be of concern. (likely reason is considered to be that drill readings are a resistance reading and this is a combination reading of lateral penetrative resistance as well as shear loads required by the bit tip to slice through timber fibres at various angles to fibre orientation eg shearing occurs parallel and at random angles to timber fibre direction )

Sample 2 graph at left, at 88.0% Moisture Content (MC) indicated

and next graph (below) at indicated 14.4%MC.

Readings taken from new SG8 pinus radiata using Protimeter resistance meter.

Readings taken from points at 20mm centres, along plane of timber grain to ensure minimal impact to test in regard to variance of earlywood and latewood.

Net result indicates minimal graphical difference values between high and EMC (equilibrium moisture content) approximated moisture levels.

Phase 5: Fractometer comparison with micro-drilling including relationship to compliance documents. (Equipment sourced)

Comparison between test results and timber testing properties in accord with NZS: 3622:2004.

Further testing involving taking samples from critical points in sample(s) identified by test graphs, where there is a transition from sound to decayed wood and determining the degree of correlation to timber strength when tested for compression, bending and tension using an IML Fractometer Mark

Programmed testing also involves the same methodology being applied to other timber species as samples become available and demand and demand for micro-drilling testing is required.

Specific testing involves has involved sourcing dendochronological level dry wood core drills capable of extracting parallel to grain cores to test bending stiffness.

Phase 6: Microbiological comparison with micro-drill test results in timber transitioning from sound to decayed. (Possible test methodology)

Microbiological comparison of samples and phase 5 results by independent laboratory such as Biodet.

NOTE: The value of this testing is being considered and is not currently scheduled.

Arguably the decision to retain or replace building elements in leaky homes should be driven by timber meeting or failing the requirements of NZS:3602, :3603, :3604 and :3622. These are “strength” related criteria – not decay presence criteria.

As micro-drilling is considered to evaluate strength – it becomes a moot point whether decay impact is a Building Consent / Safe & Sanitary criteria that warrants consideration.

[Click to enlarge any image]

Argument in simple terms is - if the timber meets Building Code requirements, that is all that is required to meet for compliance.

This is the same for supplied timber for remediation which is tested for strength only.

Presence of incipient, surface or minor decay is irrelevant to decisions to retain or replace as effective remediation practice should ensure future moisture levels remain at or below 18% at which level any remaining timber decay fungi reportedly cannot thrive.

Current best practice remediation also includes in situ preservative treatment and removal of decayed timber which severely limits opportunities for framing to become structurally non-compliant at a later date. (If this was not the case complete exterior frame replacement should be the norm)

Phase 7: Blind test of hidden framing (Possible Test)

Assess building ready for extensive remediation and reclad using NDT moisture meter to help determine focus points from inside only and using micro-drill to test largely through external wall skirtings and or window liners etc

Note drill used in concert with metal detector/ stud finder for safety etc

Compare report(s) with actuals after cladding removed

Watch out: for moisture meter limitations: we [DF] have tested and demonstrated that while moisture meters are an invaluable tool in assessing building conditions, none of the moisture meter designs presently on the market can reliably detect all wet or leak in conditions in all sorts of building structures and cavities.

Moisture meters only detect current or recent leaks or moisture traps that have not dried out; past leaks and concomitant rot or insect damage in areas now dry will not be detected by a moisture meter
Moisture meters vary in the depth to which they can sense water or moisture in a structure, depending on sensing pin length, depth to which pins are inserted into a material, or depending on the circuit design of electronic moisture meters.

A short pin moisture meter will not reliably detect moisture deeper in the wall cavity such as in the wall insulation or on the cavity side of exterior wall sheathing. Even a long pin moisture meter, probing through drywall and into wall or ceiling cavity insulation, may not detect water on the surface of exterior sheathing nor even soaking wet water rivulets running down a portion of the side of a vertical stud or timber.

It's "hit or miss" using a moisture meter as a leak screening device without the accompaniment of an expert visual inspection.

Details are at MOISTURE METER STUDY. - DF

Note: Above information is copyright, commercially sensitive and is yet to be peer reviewed. It is not to be copied or circulated without the express and written permission of Incodo Limited. Adapted here by InspectaPedia.com, with permission from Incodo 8/5/2012, technical review is in process.

V4a 06/12 - ####

Author follow-up 10/8/2013

We’ve been playing with our Resistograph a little more and it’s; firmware has been updated. Have also started using a digital Fractometer manufactured by IML as well and developed some software in house that integrates everything (an example is on our www.flameback.net site)

The main advantage of this integration is that when microdrilling and Fractometer testing are done closely together on the same plane of a piece of timber the resultant graphic profiles are very similar so we have two very different test methods crosschecking each other – the key inference is that microdrills are profiling, but not measuring compressive strength parallel to grain, but a digital Fractometer can supply actual compressive strength measurements.

... this is a new methodology that advances timber testing from qualitive and opinion based to quantitive and measurement based enabling checking against code compliance documents. [1a][1b][1c] [Italics ours - Ed.]

We are using it regularly here for government agencies and other consultants and developing modules to determine density and assess other timber strength/ performance indicators.

Paul Probett, Clinton Craig, Blake Probett, "In Situ Structural Timber Strength Measurement Advances Using Qualitive Resistography and Quantitive Resisto-Fractometry" [Power Point Presentation] [1.7MB file], Paul Probett Clinton Craig Blake Probett INCODO Ltd, Tauranga, New Zealand, mail2us@incodo.co.nz, Presentation, U.S. Forest Service Conference, Madison Wisconsin, September 2013.

Paul S. E. Probett, Clinton S. Craig, Blake J. Probett, "In Situ Structural Timber Strength Measurement Advances Using Qualitative Resistography and Quantitive Resisto-Fractometry" [USFPL paper, 730KB], Paul S. E. Probett MIFPI, AsocRICS, MBOINZ, MNZIBS, NZCB. Clinton S. Craig Blake J. Probett INCODO Ltd, Tauranga, New Zealand, mail2us@incodo.co.nz, 18th International Nondestructive Testing and Evaluation of Wood Symposium - Madison, WI Sept 2013, http://www.forestprod.org/symposium2013/,
Abstract

In situ and on site evaluation of timber used for structural purposes has largely been based on methodologies that give qualitive assessments that describe condition aspects, rather than providing measurable “strength” data. This is largely due to the absence of site-friendly equipment and processes that provide the various “strength” values engineers need for meaningful structural evaluation.

Even when such methodologies are used, sample size, the degree of destructive investigation and the difficulties in quickly relating ultimate values to yield strength and/or to various local or international code requirements present issues.

This document describes a paired methodology based on electronic resistography, used alone and in concert with incremental core type fractometry coupled by using software that permits a high degree of integration of results.

This is acknowledged to be a starter paper with limitations, based on preliminary and limited research undertaken in house by a very small company, in a remote corner of the globe, undertaken by field technicians looking for solutions to a real experienced problem. It highlights, arguably, a novel direction in this area whereby specific strength characteristics of wooden structural elements can be determined on site.

Largely it identifies tools and methodologies with a strong emphasis on site applications. Keywords: digital Resistograph, digital Fractometer, fractometry, resisto-fractometry, control tests, yield strength, Woodchecker, in situ, on-site, timber strength.

...

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Citations & References

In addition to any citations in the article above, a full list is available on request.

[1] Paul Probett, Clinton Craig, Blake Probett, "An Introduction to Micro-Drilling Technology for N. Z. Structural Timber Assessment", Incodo Ltd, 4/511 Cameron Rd, Tauranga NZ, article adapted by InspectAPedia with permission, August 2012. Contact the authors by Email: Paul Probett, mail2us@incodo.co.nz , Tel: 027 28 000 36 (Mobile) Website: https://www.incodo.co.nz/ [Copy of this article on file as Microdrilling_Assessment_Incodo.pdf]
Quoting from the Incodo website the company describes its services:
- Incodo Forensic Building Pathology:
  The Forensic Building Pathology division provides evidence in report form to government agencies, consultancy firms, lawyers and others, when truly independent analysis based on comprehensive testing is required. Incodo arguably has the largest, most up-to-date and comprehensive range of building investigation equipment available and has developed unique methodologies particularly in the field of non-destructive testing for leaking structures.
- Incodo In situ Timber Assessment:
  The in-situ Timber Assessment division provides a service whereby technicians use state-of-the-art timber resistance drill technology to profile variations in timber density associated with timber decay.
  The work is done on site and the results are instant.
  
  This technology is objective and evidential in nature and provides assessment as to whether wood is significantly decayed, suspect or suitable for retention. The technology has particular application in locating and assessing hidden decay.
[1a] Paul Probett to Daniel Friedman, personal communication, 10/8/2013
[1b] Paul Probett, Clinton Craig, Blake Probett, "In Situ Structural Timber Strength Measurement Advances Using Qualitive Resistography and Quantitive Resisto-Fractometry" [Power Point Presentation] [1.7MB file], Paul Probett Clinton Craig Blake Probett INCODO Ltd, Tauranga, New Zealand, mail2us@incodo.co.nz, Presentation, U.S. Forest Service Conference, Madison Wisconsin, September 2013.
[1c] Paul S. E. Probett, Clinton S. Craig, Blake J. Probett, "In Situ Structural Timber Strength Measurement Advances Using Qualitative Resistography and Quantitive Resisto-Fractometry" [USFPL paper, 730KB], Paul S. E. Probett MIFPI, AsocRICS, MBOINZ, MNZIBS, NZCB. Clinton S. Craig Blake J. Probett INCODO Ltd, Tauranga, New Zealand, mail2us@incodo.co.nz, 18th International Nondestructive Testing and Evaluation of Wood Symposium - Madison, WI Sept 2013, http://www.forestprod.org/symposium2013/,
Abstract
In situ and on site evaluation of timber used for structural purposes has largely been based on methodologies that give qualitive assessments that describe condition aspects, rather than providing measurable “strength” data. This is largely due to the absence of site-friendly equipment and processes that provide the various “strength” values engineers need for meaningful structural evaluation. Even when such methodologies are used, sample size, the degree of destructive investigation and the difficulties in quickly relating ultimate values to yield strength and/or to various local or international code requirements present issues. This document describes a paired methodology based on electronic resistography, used alone and in concert with incremental core type fractometry coupled by using software that permits a high degree of integration of results.
This is acknowledged to be a starter paper with limitations, based on preliminary and limited research undertaken in house by a very small company, in a remote corner of the globe, undertaken by field technicians looking for solutions to a real experienced problem. It highlights, arguably, a novel direction in this area whereby specific strength characteristics of wooden structural elements can be determined on site. Largely it identifies tools and methodologies with a strong emphasis on site applications. Keywords: digital Resistograph, digital Fractometer, fractometry, resisto-fractometry, control tests, yield strength, Woodchecker, in situ, on-site, timber strength.
[2] Thomas Tannert, Andreas Muller, Mareike Vogel, "Applications and limitations of NDT: a timber bridge case study", NDTCE’09, Non-Destructive Testing in Civil Engineering Nantes, France, June 30th – July 3rd, 2009, web search 8/3/2012, original source: http://www.ndt.net/article/ndtce2009/papers/144.pdf [copy on file as Tannert_Timber_Test_144.pdf]
Abstract
The applications and limitations of different non-destructive and semi-destructive techniques to evaluate the structural integrity of timber members in a pedestrian bridge are presented as a case study. Sophisticated assessment tools are required to detect hidden damages in timber structures: for example stress-wave techniques are used to evaluate the modulus of elasticity of bending members and resistance to drilling is used to gain knowledge of areas of changed density due to insect or moisture induced damages. Reliably relating the gathered data to the structural integrity of the structure is a complex issue. Bending members and connection details of a decommissioned timber bridge were evaluated using non destructive assessment tools. Eventually these parts were tested destructively to assess their remaining modulus of elasticity and load bearing capacity. The need for improvements in the current practice is highlighted by comparing the results from the non-destructive, semidestructive and destructive tests.
[3] Bohumil Kasal, Thomas Tannert, "RILEM Technical Committee on In Situ Assessment of Structural Timber", Bohumil Kasal et al., 2010, Advanced Materials Research, 133-134, 271, Abstract: Timber is an intriguing structural material and the only one that is truly renewable. Being biodegradable, hygroscopic and non-isotropic, it presents special challenges when assessing its integrity in structures. The presented paper outlines the major issues related to in-situ evaluation of structural timber and summarizes the work of the RILEM Technical Committee 215-AST “In-situ assessment of structural timber”. The committee was established in 2005 to bring together leading scientists and practitioners in the field of evaluation of timber in existing structures. Timber structures have been investigated for decades using numerous techniques that have been either developed specifically for the material or were transferred from other fields of investigation. A state-of-the-art report describing existing and emerging technologies and methods was prepared by the RILEM committee. The report describes the principles, the applications and the limitations of major evaluation techniques for in-situ assessment of timber. A brief discussion of codes standards and future research needs shows that much needs to be done in this area. As a present activity, harmonized test procedure recommendations are being prepared that will provide the engineering community with valuable guidance when evaluating timber structures.
[4] Bohumil Kasal & Thomas Tannert (Editors), State of the Art Reports: In Situ Assessment of Structural Timber, ISBN 978-94-007-0559-3, Rilem 2010
[5] Bohumil Kasal, Tension Micro Specimens, In Situ Assessment of Structural Timber RILEM State of the Art Reports, 2011, Volume 7, 75-80, DOI: 10.1007/978-94-007-0560-9_8, [excepts chapter 7 on file: Tension Micro-Specimens, as Kasal_Testing.pdf]
Abstract The principle of this method is extracting triangular specimens (about 5 mm equal-sides triangle) along the length of the member. Small-kerf circular saw with a fixture attached to the surface of the member is used to extract the specimens. Specimens are then glued to the test blocks and tested in tension. The method gives direct values of tensile modulus of elasticity and strength for clear wood. The values are local and pertain to the tested area and surface.
[From chapter 7.1 Background: This method was developed by Kasal and is based on direct measurement of tension properties along fibers. Bending strength evaluation is an important aspect of in situ evaluation of timber members as it is one of the predominant modes of loading, but estimates of the bending properties in situ can present a challenge. With information on the member's tensile properties, bending strength estimates can be made; tensile strength has been related to bending strength and is considered to be approximately equal. Tensile properties have a poor correlation with compression properties therefore tensile strength can not be estimated using information attained with the core drilling technique. Specimens can however be extracted to evaluate the tensile properties of in situ members with the technique described in the following sections....']
[Also] Kasal B, Anthony R: Advances in in-situ evaluation of timber structures. Progress in Structural Eng and Materials. 6(2):94-103, 2004.
[6] Thomas Tannert, Andreas Müller, Mareike Vogel, "in-situ assessment, hot spots, moisture content, block-laminated timber", ICTB 2010, Bern University of Applied Sciences. ISBN 978 8251 926805, in-situ assessment, hot spots, moisture content, block laminated timber,
Abstract:
Timber has been a structural material for bridges for centuries and numerous examples throughout the world demonstrate its durability. But timber is biodegradable and hygroscopic and regular inspections are recommended to determine the condition of the structure. This paper reports on the structural health monitoring of timber bridges in general and the long term moisture measurement inside block-laminated timber elements of several traffic bridges in specific. Presently there is no reported scientific information available on the long-term moisture behaviour and the resulting moisture induced stresses and dimensional changes of block-laminated timber elements. The paper reports on the monitoring of the moisture content of a block-laminated timber bridge.
[References 7-13 below are cited from this document]
[7] Wilkinson K, Thambiratnam D, Ferreira L. Non Destructive Testing of Timber Bridge Girders. In Proceedings Int. Conf. on Structural Condition Assessment, Monitoring and Improvement, Perth, Australia, 2005.
[8] Kasal B, Anthony R: Advances in in-situ evaluation of timber structures. Progress in Structural Eng and Materials. 6(2):94-103, 2004.
[9] Gerold M. Bloc-Glued Laminated decks for timber bridges. Structural engineering international, 12(3): 214–217, 2002.
[10] Graham T. Overview of non-destructive evaluation technologies. In Proceedings of the Nondestructive Evaluation of Aging Bridges and Highways, Ed by S. Chose, 1995.
[11] Duwadi SR, Ritter MA. An Overview of the Wood in Transportation Program in the United States, In Proceedings 5th World Conference on Timber Engineering, Montreux, Switzerland, 1998.
[12] Rinn F, Schweingruber FH, Schär E. Resistograph and X-Ray Density Charts of Wood. Comparative Evaluation of Drill resistance Profiles and X-Ray Density Charts of Different Wood Species. Holzforschung 50:303-311, 1996.
[13] Brashaw B, Vatalaro RJ, Wacker JP and RJ Ross. Condition Assessment of Timber Bridges: 1. Evaluation of a Micro-Drilling Tool. Gen. Tech. Rep. FPL-GTR-159. Forest Products Laboratory Madison, WI. 2005.
[14 Simpson W. Drying and Control of Moisture Content and Dimensional Changes. Chapter 12, Wood handbook - wood as an engineering material. General Technical Report FPL–GTR– 113. Forest Products Laboratory, WI, 1999.
[15] "Fractometer Print Manual", IML Instrumenta Mechanik Labor System GmbH Großer Stadtacker 2 69168 Wiesloch • Germany, 02-2008, web search 8/4/12, original source: http://www.imlusa.com/Fractometer_Print_eng_web_A4.pdf [Copy on file as Fractometer_Print_eng.pdf]
[16] Bob Monk, "Evaluation of Decay Detection Equipment in Standing Trees", USDA Forest Service, web search 8/4/12, original source http://www.fs.fed.us/eng/techdev/IM/tree_decay/tree_decay_detect_equip.shtml [Copy on file as Monk_Tree_Deday_Detection.pdf] Introduction - quoting:
A project was proposed to test and compare several of the devices that are able, to some degree, to detect decay in trees. Decay in trees is directly related to the hazards that they present. However, detection of decay does not necessarily mean that a tree is hazardous. The identified devices can be used to determine what decay is present. It is still necessary to use professional experience and sound judgment to decide if a tree actually poses a hazard. General guides or "rules of thumb" can also be used, such as Guidance notes from the Minnesota Department of Natural Resources and the USDA Forest Service, 1996 that suggests a 25 mm ring of sound wood is required for every 150 mm of stem diameter at any point on the stem. If the proportion of decayed wood to sound wood exceeds this level then action may need to be taken to minimize the hazard posed by the tree (Lawday and Hodges, 2000). [Additional selected citations from this article are below]
- [16a] Larsson, B.; Bengtsson, B.; and Gustafsson, M. 2004. Nondestructive Detection of Decay in Living Trees. Tree Physiology. 24: 853-858
- [16b] Moore, W. 1999. The Combined Use of the Resistograph and the Shigometer for the Accurate Mapping and Diagnosis of the Internal Condition of woody Support Organs of Trees. Arboriculture Journal. 23: 273-287
- [16c] Nicolotti, G.; Socco, L.V.; Martinis, R.; Godio, A.; and Sambuelli, L. 2003. Application and Comparison of Three Tomographic Techniques for Detection of Decay in Trees. Journal of Arboriculture. 29(2): 66-77
- [16d] Seavey, R.; and Larson, T. 2002. Inspection of Timber Bridges. Minnesota Department of Transportation Technical Report MN/RC-2002-34. St. Paul, MN. 43 p.
- [16e] Wang, X.; Divos, F.; Pilon, C.; Brashaw, B.K.; Ross, R.J.; and Pellerin, R.F. 2004. Assessment of Decay in Standing Timber Using Stress Wave Timing Nondestructive Evaluation Tools: A Guide for Use and Interpretation. Gen. Tech. Rep. FPL-GTR-147. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. 11 p.
[17] Pilodyn Wood Tester, USA / Canadian Source: Intech-NDE, 6211 Roper Road Edmonton, Alberta T6B 3G6, Tel: 1 888-576-7756 or Intech-NDE, 140 - 8851 Beckwith Road Richmond, B.C., Tel: 1 800-677-8884, or USA Tel: 800-297-3208, Website: http://www.intechnde.com, web search 8/4/12, original source: http://www.corvib.com/pilodyn/ Quoting:
Pilodyn is an easy-to-use wood testing instrument which is suitable for trees, railway ties and utility poles. The Pilodyn wood tester (Hylec Controls) is described by and currently available in North America from InTech/NDE U.S. Tel: 905-716-5604 / 800-297-3208, or Email: bnadeau@intechnde.com
[18] Pilodyn Wood Tester, Hylec Controls, available in Australia from Ferret http://www.ferret.com.au/n/Pilodyn-wood-density-meter-from-Hylec-n852069 - Quoting:
Pilodyn, available from Hylec Controls , was developed to determine the density and strength of dead and living wood. Invisible soft rot can be detected rapidly and objectively in an easy non-destructiveway and the reduction in strength associated with it can be determined. This can be of vital importance in the case of wooden playground structures,climbing frames and telephone masts.
With PILODYN 6J Forestversion the density of the wood is determined on living trees. The damage is so little that the tree suffers no harm and the testing method is regarded as non-destructive.
Testing procedure: The testing procedure is very simple: The tester is loaded with the ramrod and then pressed firmly onto the tet surface. The impact pin is shot into the wood by pressing the trigger cover. The depth of penetrationcan be read straightaway in mm on the scale mounted on the tester.
Typical applications of the Pilodon:
Testing the stability of wooden structures on playgrounds, detection of soft rot
Testing the strength on wooden telephone masts, detection of soft rot
When thinning out: sorting out trees with undesirable density of the wood
Early detection of diseases: periodic measurement detects unnatural changes in the wood density
Comparison of the location-dependent density to determine the optimal location for the respective tree species
Establishing productivity with respect to density for the same tree species and similar location properties for culture purposes Testing and sorting of cut wood into timber classes
[19] Hylec Controls, 8 Melissa Street AUBURN NSW 2144 AUSTRALIA, Tel: 1300 522 004, Email: sales@hyleccontrols.com.au, http://www.ferret.com.au/c/Hylec-Controls
[20] Brashaw, Brian K.; Vatalaro, Robert J.; Wacker, James P.; Ross, Robert J. 2005. "Condition Assessment of Timber Bridges: 1. Evaluation of a Micro-Drilling Resistance Tool" Gen. Tech. Rep. FPL-GTR-159. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. 8 p., web search 8/5/2012, original source: http://www.fpl.fs.fed.us/documnts/fplgtr/fpl_gtr159.pdf [copy on file as Micro_Drill_Study_USDA_fpl_gtr159.pdf] This publication is also available from the U.S. FPL at www.fpl.fs.fed.us
Abstract:
The research presented in this report was conducted to evaluate the accuracy and reliability of a commercially available micro-drilling resistance device, the IML RESI F300-S (Instrument Mechanic Labor, Inc., Kennesaw, Georgia), in locating deteriorated areas in timber bridge members. The device records drilling resistance as a function of drilling depth, which allows the operator to assess the location of deterioration in the member cross section. Bridge components containing different levels of natural decay were used as test specimens in this study. The IML RESI F300-S was first used to assess decay in the timber bridge specimens. The specimens were then sawn along their length into slabs to expose their interior condition. The interior faces of these slabs were inspected visually and with a stress-wave probe to confirm if deterioration was present. On the basis of these tests, we conclude that this micro-drilling device accurately determines if deterioration is present at the point at which the test is performed. Keywords: timber, bridges, inspection, drilling resistance, nondestructive evaluation
Excerpt from the study's conclusions:
Based on our tests, we offer the following comments about the accuracy of using the IML RESI F300-S for locating deterioration in bridge timbers:
1. The tool is accurate at determining the presence of decay in timber bridge specimens. However, these data are limited to the drilling location.
2. The tool can precisely locate an internal defect (decay pocket, check, or split) within the member’s cross section. This can be advantageous for condition assessment and load rating purposes.
3. Decay indices were developed for Douglas-fir timbers as follows: sound, >25% resistance; moderate decay, 10–25%; and advanced or severe decay, 0–10%.
One drawback is that multiple, time-consuming drilling would be required to map the area and extent of the decay in the other plane. Another possible drawback is the potential to spread the decay to sound areas within a timber or to sound timbers by multiple use of a contaminated drill bit. Routine cleaning of drill bits, or replacement with a new one, would greatly reduce this potential drawback.
It is crucial to use this or any nondestructive testing tool or device as part of a comprehensive condition assessment. Such an assessment should incorporate an in-depth visual inspection, knowledge of prior use of the structure, and a working knowledge of fundamental engineering properties of structural wood products. This technique, when used in concert with visual and ultrasound techniques, would provide a very accurate description of the condition of timbers.
[21] Brashaw, B.K.; Vatalaro, R.J.; Erickson, J.R.; Forsman, J.W.; Ross, R.J. 2004. Final Report: A Study of Technologies to Locate Decayed Timber Bridge Members. Project No. 187-6456, NRRI/TR-2004-06. Duluth, MN: UM-Duluth, Natural Resources Research Institute.
[22] Brashaw, B.K.; Vatalaro, R.J.; Ross, R.J.; Wacker, J.P. 2005. Condition Assessment of Timber Bridges: 2. Evaluation of Several Commercially Available Stress Wave/Ultrasonic Tools. Gen. Tech. Rep. FPL-GTR-160. Madison, WI: USDA Forest Service, Forest Products Laboratory.
[23] Ross, R.J.; Brashaw, B.K.; Wang, X.; White, R.H.; Pellerin, R.F. 2004. Wood and Timber Condition Assessment Manual Madison, WI: Forest Products Society. 74 p.
[24] Troltech GMBH & Co. KG. Deutchland, Grebbener Str. 7, D-52525 Heinsberg, Deutchland, produces the Trotec T2000, Tel: 02452 962-450, International: +49 2452 962-450, Email: online@trotec.de, Website: http://www.trotec.de/, Web page for the Troltec T2000: http://www.trotec.de/en/product-catalog/measuring-instruments/multi-function/t2000/
[25] Paul Probett, Incodo, Ltd., "Thermal Imaging and Building Surveying / Inspection" 2008, Incodo Ltd, 4/511 Cameron Rd, Tauranga NZ, article adapted by InspectAPedia with permission, August 2012. Contact the authors by Email: Paul Probett, mail2us@incodo.co.nz , Tel: 027 28 000 36 (Mobile) Website: https://www.incodo.co.nz/ [Copy of this article on file as Thermal Imaging NDT Presentation 2008.ppt ]

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
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
The Journal of Light Construction has generously given reprint permission to InspectAPedia.com for certain articles found at this website. All rights and contents to those materials are ©Journal of Light Construction and may not be reproduced in any form.
Allen, Edward and Joseph Iano. Fundamentals of Building Construction: Fourth Edition. Hoboken: John Wiley & Sons, 2004. pg. 91 [LVL lumber]
APA - The Engineered Wood Association [Website: www.pacificwoodlaminates.com ], 7011 So. 19th St., PO Box 11700, Tacoma WA 98411-0700, Tel: 253-565-7265. APA provides an HDO/MDO Plywood Product Guide that offers details about these products., provides an HDO/MDO Plywood Product Guide that offers details about these products. Product support help desk: 253-620-7400. Email the APA at help@apawood.org. Web search 09/13/2010, original source: http://www.pacificwoodlaminates.com/img/PDFs/PlywoodGuide.pdf
Building Failures, Diagnosis & Avoidance, 2d Ed., W.H. Ransom, E.& F. Spon, New York, 1987 ISBN 0-419-14270-3
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
CRAWL SPACE MOISTURE CONTROL [PDF] U.S. Department of Energy
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.
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.
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
Historic Preservation Technology: A Primer, Robert A. Young, Wiley (March 21, 2008) ISBN-10: 0471788368 ISBN-13: 978-0471788362
Manual for the Inspection of Residential Wood Decks and Balconies, by Cheryl Anderson, Frank Woeste (Forest Products Society), & Joseph Loferski, October 2003, ISBN-13: 978-1892529343,
Microllam Laminated Veneer Lumber (LVL) and/or Parallam Parallel Strand Lumber (PSL) MSDS Material Safety Data Sheet, courtesy of Weyerhaeuser Company, PO Box 9777, Federal Way, WA 98063-9777 Tel: 253-924-3865
Log Homes: Log Home Design, U.S. Department of Energy
In addition to citations & references found in this article, see the research citations given at the end of the related articles found at our suggested

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Carson, Dunlop & Associates Ltd., 120 Carlton Street Suite 407, Toronto ON M5A 4K2. Tel: (416) 964-9415 1-800-268-7070 Email: info@carsondunlop.com. 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 - the Encyclopedia of Homes and to use illustrations from The ILLUSTRATED HOME .

Carson Dunlop Associates provides extensive home inspection education and report writing material. In gratitude we provide links to tsome Carson Dunlop Associates products and services.

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