This can be for access, connecting adjoining properties, or reusing redundant flue voids as ventilation or service ducts. It is often necessary to accurately locate the position of chimney flues before opening up walls. The position of detected flues is plotted on CAD elevation drawings.Īdvantages of our GPR chimney flue surveys: Typically we save the GPR data electronically for off-site analysis. This produces better and more accurate results. However, we recommend off-site data processing and analysis. We can interpret the GPR data on-site in real-time to provide instant results with an on-site mark-up. Detected chimney flue locations plotted in CAD. We also issue the original CAD drawings in AutoCAD. The report includes CAD elevation drawings with the location of all detected flues marked. We present the results of our interpretation in a comprehensive factual report issued in pdf format. This can affect the positional accuracy of detected flues. Irregular surfaces, such as ornate mouldings, may result in poor surface coupling and antenna tracking problems. Therefore, it does not work on panelling, dry lining or stud wall construction. GPR works on most materials however, the GPR signal does not travel well across voids. Therefore, it is desirable to use the highest frequency possible while still meeting the objectives of the survey. On thick walls, we can use lower frequencies to provide greater penetration depth, but the resolution and detail of GPR scan data decrease with lower antenna frequencies. In most cases, we use a GSSI SIR3000/4000 GPR control unit with a 1500/1600 MHz antenna.
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