Non-destructive Assessments
We use a range of non-destructive testing techniques, including Ultrasonic Decay Detection(UDD) instrumentation which quickly locates cross sectional decay beneath the surface of timbers. The Resistograph microdrill is used to help quantify the extent of sub-surface decay and is extremely adept at assessing timbers imbedded in masonry walls.
Ultrasonic Decay Detection (U.D.D)
We use the U.D.D to detect decay beneath the surface of timber. An ultrasound pulse is transmitted through the subject timber and the time it takes to cross the section is recorded. The signal travels faster through ‘good’ timber and therefore, delays outside the allowed parameters, provide a strong indication of the presence of cross sectional decay.
The instrumentation is very sensitive and can even detect the early onset of decay.
Large numbers of timbers can be quickly and cost effectively assessed using this non-destructive technique.
Resistograph Investigations
We use the Resistograph microdrill for the assessment and detection of sub-surface decay and defects in timber. It is extremely adept at assessing decay in the ends of beams and joists embedded in masonry.
A 1.5 mm needle is drilled at a constant speed into the subject timber and the microdrill measures the resistance of the timber against the needle, producing a 1:1 scale reading.
The reading is analysed and the exact location of any decay present will be identified and is quantifiable.
Holes are refilled automatically with the extraction of the needle, leaving nothing visible or at worst something resembling a beetle flight hole, depending on the timber species being assessed.
The Resistograph and U.D.D are the most accurate, sensitive and cost effective way of assessing sub-surface decay in timbers.
Borescope
We use borescopes to look behind panelling, below suspended timber floors and into ceiling voids, allowing a thorough assessment with the minimal of disruption and loss of fabric.
