Plywood Industry Standards
The use of plywood in the construction industry when it comes to all wood-based panels and the standard EN 13986 updated for joinery, both internal and external use of standard plywood from any one of the three must adhere to EN636 stipulates that performance class.
For example, if you have previously supplied weatherproof or outdoor quality wood for use in the construction industry, you should indicate that it meets the EN636, Class 3 standard.
In the same way, if you have previously purchased or supplied moisture-resistant wood for use in construction, you should make sure that it meets the EN636, class 1 standard.
The requirements for each class can be summarized as follows:
Plywood for Dry Conditions
This refers to top plywood specifically for interior applications exposed to minimal moisture. Standards applicable to this type of plywood include EN636 Class 1, which defines plywood quality, EN 314-2 Class 1, EN 310 for bending testing, and EN 13986 for all wood-based panels used in construction. Plywood for use in dry conditions is ideal for all interior joinery, pipe boxes, doors, underfloors, and a wide variety of weight-saving applications.
Plywood for Humid Conditions
The EN 636-2 standard applies to plywood to be used in humid conditions characterized by relatively high moisture content and a temperature below 20oC. The relative humidity in the environment should exceed 85% for a few months a year. This type of plywood is suitable for interior use to create floors, walls, cladding, roofing, and even underlayment. Other applicable standards include EN 13986 for wood-based panels, EN 335 for durability, and EN 314-2 for plywood quality.
Plywood for Outdoor Use
Plywood standards for outdoor use define plywood to be used in certain climatic conditions that lead to extremely high moisture content and other outdoor weather conditions. This type of plywood can be used for both interior and exterior joinery that can be exposed to prolonged wetting and extreme heat. Applicable standards include EN 636 Class 3, EN 335, EN 310, and EN 13986.
