Exterior Plywood

Exterior plywood is non-structural plywood suitable for exterior door skins, hoardings, signs and cladding. No stress grades are applied to exterior plywood. For assured performance exterior plywood should be branded with one of the "PAA/JAS-ANZ" exterior plywood product certification stamps.

Exterior plywood manufactured to AS2271 possesses either a permanent Type A bond or a less durable Type B melamine urea formaldehyde bond. Type A bonded exterior plywood must be specified for applications involving long term full exposure. Type B bonded plywood can be specified for semi exposed applications or when the total exposure time is less than two years.

Two standard face grades are produced: A grade, designed for clear finishing and B grade, designed for painting. Standard grades of exterior plywood are AD and BD, with one appearance grade side.

All permanently exposed Type A bonded exterior plywood should be treated against fungal attack and the surface should be finished with paint or water repellents to minimise surface checking.

Reference: Plywood Association of Australia

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Timber Research Unit
Department of Architecture
University of Tasmania