Plywood specifications – EN636 | ||
Following on from the EN314-2 tests, plywood panels are required to comply with one of the three performance classes within EN636 for use in construction. This takes into account the quality of the bond and the durability of the timber species used. | ||
The requirements for each class are as follows: | ||
What are you using the plywood for? | EN | Usage class |
Plywood for use in dry conditions | EN636-1 | Class 1 – This class is appropriate for normal interior conditions. (Urea Formaldehyde) |
Uses | Warm roofs, intermediate floors, internal timber frame and partition walls. | |
Plywood for use in humid conditions | EN636-2 | Class 2 – This class is appropriate for protected external applications, it is also suitable for interior situations where the service moisture content is raised above the Class 1 level. (Melamine Urea Formaldehyde) |
Uses | Cold roofs, ground floors and external timber frame walls. | |
Plywood for use in exterior conditions | EN636-3 | Class 3 – This class is designed for exposure to weather over sustained periods. (Phenol formaldehyde)** |
Uses | Fully exposed service conditions. | |
These classes are determined by laboratory tests in which different plywood panels are subjected to simulated weather conditions. | ||
*Please note, all plywood should be fully sealed before exposure to moisture, both internally and externally. |
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