Use Classes are defined by British and European Standards, providing a guide to the risk of decay and insect attack to timber components, depending upon their end use. The higher the Use Class, the higher the level of preservative protection required. SVW treat all our timbers to meet either Use Class 3 or 4.
| USE CLASS | TYPICAL SITUATION |
| 1 | Internal building timbers with no risk of wetting or condensation. |
| 2 | Internal building timbers with a risk of wetting or condensation. |
| 3 | External building, fencing and landscaping timbers used out of ground contact. |
| 4 | External building, fencing and landscaping timbers used in ground contact. |
