Tongue and Groove (T&G)

The appearance of T & G or Tongue and Groove within the APA trademark indicates that the panel has a tongue and groove profile on its two long edges which is to an APA approved pattern.

  • This eliminates the need for support (blocking) under adjacent panel edges to prevent them from deflecting independently of each other when load is applied.
  • The material removed to create the tongue normally reduces the width of the panel by approximately 12.5 mm (1/2”), therefore, the net width of the panel may be 47-1/2” (1206 mm).

Examples of APA trademarked OSB panels and popular OSB grades.