The treatments are designed to enhance the durability of the wood, protecting it against biological degradation such as wood-boring insects and fungi. Preservatives can be applied to the surface of the wood or inserted throughout the structure. The penetration of products into the wood is essential for their effectiveness. A range of impregnation processes are employed, including short dipping and deep impregnation by autoclave. The selection of treatment depends on the intended use of the wood and its inherent characteristics.
CLASSES |
TIMBER USES |
SITUATIONS |
INSECT BIOLOGICAL HAZARDS |
BIOLOGICAL HAZARDS |
SUITABLE SPECIES |
|
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WOOD SHELTERED FROM MOISTURE For wood with a thickness of less than 27 mm. |
2 |
CLASSIC FRAMING ROOFING TIMBER FRAMES FLOOR JOISTS TRUSSES ATTIC CONVERSION ALL CONSTRUCTION PROTECTED WOOD INSULATION TIMBER |
WOOD PROTECTED AND OFF THE GROUND TEMPORARILY MOISTENED WOOD OPERATION HUMIDITY +18% |
INSECTS TERMITES BY REGION |
SURFACE FUNGI |
SPRUCE , DOUGLAS-FIR PINE SCOT PINE DOUGLAS PINE LARCH |
| OUTDOOR WOOD NOT IN CONTACT WITH THE SOIL | 3 |
SIDING DECKING BOARDS EXTERIOR JOINERY |
WOOD SUBJECT TO ALTERNATING HUMIDITY AND DROUGHT |
INSECTS TERMITES |
BROWN AND WHITE ROTS |
PINE SCOTT PINE SYLVESTRE FUR DOUGLAS FUR LARCH |
| WOOD IN CONTACT WITH THE GROUND FOR OUTDOOR USE | 4 |
LANDSCAPING LAND RETAINMENT |
WOOD IN CONTACT WITH THE GROUND AT A MOISTURE CONTENT OF ALWAYS = 20% |
INSECTS TERMITES |
BROWN AND WHITE SOFT ROTS | SYLVESTRE FUR |