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Protection and impregnation of wood

FAQ

Wood application classes

Wood and wood-based products are in their use exposed to different levels of risk.  The risk of attacking by biological wood pests such as wood decaying fungi and wood-destroying insects, grows with the effects of weather conditions to which the material is exposed. Standard ČSN EN 335- defines five classes representing various wood exposures. 

Use class Description  Pests Examples of wood application

1

Wood is under shelter, fully protected against weather conditions, not exposed to moisture

insect

timber roof, floor boards, battens, carpentry and joinery timber

2

Wood is under shelter, fully protected against weather conditions; ambient humidity or vapour condensation may lead to occasional increase of wood moisture

insect, fungi

construction timber, cladding, roof timber with increased risk of condensation

3

Wood is under in exterior above the ground, repeatedly exposed to increased humidity

insect, fungi

exterior timber, ceilings, peripheral structures, roof shingles, railings, fence boards

4

Wood is in permanent contact with the ground or fresh water, exposed to moisture effects

insect, fungi

electricity poles, sound barriers , wooden foundations, children's playgrounds, pillars, bridge structures

5

Wood is constantly exposed to sea

water marine pests, fungi

pillars, piers, jetties, boat hulls

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