METHOD OF INSPECTING WOODEN CONSTRUCTIONS
An investigation of wooden materials always requires a detailed blueprint of the building or structure. Blueprints must be available under the most favorable circumstances and are the basis for study without major corrections. Often blueprints are not available and sketches have to be made on site. Sketches must include all wooden components. A visual inspection and tapping with a hammer of the wood is the first step. With this method the initial damage in the wooden structure can be located. The detailed investigation on the damages found and the correct selections of drill resitance measurements with a Resistograph ® from RINNTECH follows the visual inspection. A 3mm steel needle is drilled into the wood to test the density of the material and is shown and recorded. This method is necessary to detect hidden damages inside or on the backside of the wood which is hidden from the view.
With this method not only the individual tree rings are revealed, but also cracks, inner decay and insect damages can be detected in their extensive proportions.Wood joints can also be detected and checked. For glue lamination and its construction the damage is found in the individual lamination which most of the time does not externally appear. Based on these results a determination can be made as to the healthy cut of the wood whether it can be repaired or a complete replacement is necessary. Repair measures can thus be planned better before the renovation.This prevents unnecessary surprises during the construction phase and provides customer cost savings. Historical fabrics in monuments can be saved by this method.
Resistograph ® drill resistance measurements have a high resolution and can capture the smallest interferences in the wood structure. Decays can thus be detected at an early stage.
The results are presented in a three-color system in the blueprints and with the degree of damages. Moisture measurements, other detected abnormalties and compounds without power bonding are documented,also the dimensions of the wood (if required). Structural engineers, architects and craftsmen find a quick and simple way to gain an overview of the quality and durability of the wooden components and plan their remedial measures.
Another advantage of this method is that it is not necessarily needed to do structural openings in order to investigate the underlying wooden beams. Valuable floorboards or parquet floor do not require necessarily to be opened to get a statement about the status of the underlying beams.
This can be drilled through the floor into the underlying component and leaves a 3mm pin hole in the floor. If there are tiles or cast plastered floors over the beam, a 5mm drill is required to drill between the joint or directly through the floor. Followed by a full examination of the Resistograph®.
If dry rot infestation is present a specific remedial measures is required. If other fungal species are present , which may have damaged further the wood, fungal samples are taken and analyzed in the laboratory to the affected areas.