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STRUCTURAL INSPECTIONS & DEFECTS
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DEFINITIONS of ENGINEERED WOOD OSB LVL etc
DISASTER BUILDING INSPECTION & REPAIR
EARTHQUAKE DAMAGED FOUNDATIONS
FIRE DAMAGE vs MOLD DAMAGE
FLOOD DAMAGE ASSESSMENT, SAFETY & CLEANUP
FOOTING & FOUNDATION DRAINS
FOUNDATION CRACKS & DAMAGE GUIDE
FRAMING DAMAGE, INSPECTION, REPAIR
GRADING, DRAINAGE & SITE WORK
HOUSE PARTS, DEFINITIONS
INSECT INFESTATION / DAMAGE
KIT HOMES, Aladdin, Sears, Wards, Others
LOG HOME GUIDE
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MODULAR HOME CONSTRUCTION
MOISTURE CONTROL in BUILDINGS
PORCH CONSTRUCTION & SCREENING
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RETAINING WALL DESIGNS, TYPES, DAMAGE
ROT, FUNGUS, INSECT DAMAGE
SINKHOLES, WARNING SIGNS
STAIRS, RAILINGS, LANDINGS, RAMPS
STRAW BALE CONSTRUCTION
STRESS SKIN INSULATED PANELS
STRUCTURAL WOOD ASSESSMENT
TIMBER FRAMING, ROT
TRUSSES, Floor & Roof
WATER ENTRY in BUILDINGS
Micro-drilling procedure details used for determining the soundness of wood structural members: micro-drilling wood damage testing involves drilling a 2 mm hole in timber members up to 300mm. Drill resistance and related data are processed by computer to provide a graph of wood density and other properties. This article series also compares using micro-drilling with other methods to screen both standing trees and wood structural elements for hidden damage. scribe the relationship between construction details and the occurrence of structural rot in timber frame buildings.
This article series describes the various methods used to test & evaluate the structural integrity of wood-framed buildings where focus is on the condition of structural wood posts, beams and other framing members. We discuss the problems surrounding hidden rot or decay, the presence or absence of moisture or other instrument-detectable clues, and the problem of subjective decisions to replace or not-replace suspect wood structural members.
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Paul Probett, Clinton Craig, Blake Probett, Incodo Forensic Building Specialists 
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]
The original authors' article without the expanded discussion added here can be seen at An Introduction to Micro-Drilling Technology for N. Z. Structural Timber Assessment.
Additional comments, illustrations, and technical citations addressing wood structure testing technologies have been added. We and the original authors invite and will reply to reader questions and comments using the comments box found at the end of this article. Initial technical review completed 8/6/201
Our discussion of micro-drilling is divided into three segments. Below is segment 2.
Procedure for Using Micro Drilling for Timber Damage Assessment
The drill is computer controlled with drill bit rotation rpms and linear penetration independent of each other and at pre-set levels applicable to the timber species. This is a change from older generation microdrills that had rpm and penetration linked and power applied controlled by the operator.
Results are readable in real time via the onboard display as the graph is formed.
Typical testing for 100 mm p.rad framing is about 15 seconds.
Results are also processed according to developed timber specie parameters and appropriate standards (where applicable) so onboard software instantly gives a preliminary pass, fail or retest assessment of timber. Settings are adjustable to assist with the identifying of quality infractions, decay areas and splits or checks.
Information is then bluetoothed to a draft report and presented in a similar format to the following graphs and charts.
As highlighted in the 2010 RILEM State of the Art Report – In Situ Assessment of Structural Timber by Kasal and Tannert “ If strength values are require(d) the best drills available on the market are required as well as a high level of education and experience. This, proper education of the user is a critical point before applying resistance drilling” quote
Incodo endorse the above and suggest general usage, adjusting
programmable settings interpretation and moderation of results is critical.
Micro-drilling In Situ Timber assessment
Test Results: Summary
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