Bonded joints (L-joints and T-joints) are especially at risk from water absorption (rain, condensation) over bare, unprotected radial wood surfaces (joggle joints). It is therefore quite certain that lasting protection against fungi attack cannot be guaranteed in the long term if the surface of coating is damaged. Therefore, in a field investigation, using L-joints (spruce) over a total period of 44 weeks, an attempt should be made to provide "inner protection" or "preventative protection" by using fungicides in the form of protective capsules (Impel-Rods; Improsol-Fluorin-Woodpil and TBTO-glass ampulle) additionally to the customary surface protection of the wood. Moisture distribution, diffusion and effectiveness of chemicals to protect the wood against bluestain, mould and decay fungi was evaluated. Although the products showed both completely different diffusion qualities and a wide difference in the property of hindering fungus growth, the use as preventive protection would possibly represent a completely new method of prolonging the service life of wooden window frames.

Download document (818 kb)
free for the members of IRG. Available if purchased.

Purchase this document