When wood glue fails, who should you contact? As Ireland’s leading independent laboratory providing validated materials analysis used in the investigation of construction materials failure and analysis, we have the expertise and resources to undertake the most challenging investigations. Our work involves the technical examination of materials such as paints, glue, plastics, metals and wood. By performing a comprehensive failure analysis, the root causes of material failures can be identified and recommendations can be made to prevent future recurrence. Using advanced analytical equipment and techniques, our materials experts can interpret test results and provide clients with an in-depth report as to what happened and why.
The investigation of the failure of glued timber joints and wood glue in general, is a very common matter which our laboratories are asked to examine. The selection of the right glue is critical. Most timbers are easy to glue and it is generally possible to obtain good bond strength with most woods, however some wood species have certain specific characteristics which may make gluing more difficult. Some wood is highly absorbent, while some types are very dense and some are very hard. Wood adhesion can be improved by following these simple rules:
- Mix the wood glue correctly. Even though wood glues do not settle out during storage, they should be stirred before use.
- Apply the correct amount of glue to the wood. Typically, about 150g to 300 g per square meter for lamination processes.
- For laminating sheets of timber, apply the glue with a knife with a serrated blade. Use a bottle or brush when applying adhesives to joints.
- Apply sufficient clamp pressure to the joints. Typically between thirty and sixty minutes and allow the bond to cure for twenty-four hours.
