The SILEX project “Improving sustainability of construction materials using innovative Silicon based treatment” is a Life+ project with reference LIFE+11 ENV/BE/1046 and started in April 2013. This project intends to demonstrate that a new class of compounds can be used for wood treatment for an extended service life combined with enhanced new testing methodology. The project aims at demonstrating that treatments with silicon-based hydrophobers opens the door to minimize the use of biocides. This paper gives some results related to the impact of silicon-based water repellent on water absorption, moisture dynamics and biological resistance of treated wood.

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