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APA Rated Sheathing glue bond durability classification is typically Exposure 1; however, when produced as C-C, PS 1 plywood bond classification is Exterior. Exposure 1 panels may be used for applications where construction delays may be expected prior to providing protection or where exposure to the outdoors is on the underside only.
The recommendations for roof sheathing in Table 34 apply to APA RATED SHEATHING Exposure 1 or Exterior, APA STRUCTURAL I RATED SHEATHING Exposure 1 or Exterior and APA RATED STURD-I-FLOOR Exposure 1 or Exterior. Uniform load deflection limits are 1/180 of span under live load plus dead load, and 1/240 under live load only.
EN 636-1. Plywood for use in dry conditions. Service Class 1 in Eurocode 5: – Plywood to be used in conditions characterised by a moisture content in the material corresponding to a temperature of 20°C and relative humidity of the surrounding air only exceeding 65% for a few weeks per year.
Plywood has been used since the 1940s, and is considered by many to be the original engineered wood product. All glued engineered wood products are made by combining wood strands, veneers, lumber or other wood fiber with adhesive to form a larger com-posite structural unit.
Sanded plywood is produced in two bond classifications: Exterior and Exposure 1. Exterior panels are suitable for repeated wetting and redrying or long-term exposure to weather or other conditions of similar severity. Exposure 1 panels are suitable for uses not permanently exposed to weather.
BOND CLASSIFICATION. APA trademarked panels are classified as either Exterior or Exposure 1. The bond classification relates to moisture resistance of the adhesive bond in accordance with the intended end-use conditions and thus, to structural integrity.
Access a complete list of APA publications about plywood in APA's Resource Library. A basic overview of the manufacture, specification, and applications of plywood, including technical publications and a list of plywood manufacturers.
