Plywood roofing

Structural plywood is approved for use as non-trafficable roofing in AS1684.

Structural plywood can be surfaced with a wide range of water proofing membranes, ranging from felt and tar, used in the USA for industrial buildings, to fibreglass reinforced roofing shingles. Fibrous cement shingles and timber shakes are also suitable. Recommendations of the surfacing product manufacturer must be strictly adhered to.

If the roof is to be trafficable, then the plywood must be treated as a floor. Design data is contained in the article "Plywood Flooring Design".

Structural plywood roofing may have a decorative back side. Thus the roofing can also be used as an exposed ceiling.

Reference: Plywood Association of Australia brochure: "Featuring plywood in buildings".

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Timber Research Unit
Department of Architecture
University of Tasmania