Appearance vs. Grade

Grade: Typically, when the term 'grade' is used, it is referring to the beam's structural performance and characteristics.

Appearance: Just as the word implies, 'appearance' refers to aesthetic criteria, rather than performance capabilities. Color, grain pattern, texture, knot type and size are the factors that influence the appearance classification.

Rosboro Glulam

Glulam Appearances and Textures

Appearances

Glulam appearance classifications are not related to strength characteristics.

Architectural Appearance

Architectual Appearance

Used when finished appearance is important but not the overriding consideration. Suitable for applications where glulam is exposed in the finished structure, such as residences, office buildings, restaurants, and schools.

  • Voids larger than 3/4" are filled
  • Low laminations are repaired
  • All exposed faces are sanded
  • Corners of the wide faces exposed to view are eased

Premium Appearance

Premium Appearance

Matches the industry standard for premium appearance; specified for applications in which appearance is criitical. The finished glulam will exhibit the natural variation character of the lumber, such as knots and grain.

  • All voids greater than 1/4" filled with wood filler
  • Edges eased as specified
  • Wane not permitted
Face Lamination 3-1/8" 3-1/2" 5-1/8" 5-1/2" 6-3/4" 8-3/4" 10-3/4"
Maximum Void 1/2" 1/2" 3/4" 3/4" 3/4" 1" 1"
Max Sound Knot 1/2" 1/2" 3/4" 3/4" 7/8" 1-1/2" 2"

Premium "Hand Select" Appearance (Rosboro Standard)

Premium Hand Select Appearance

Rosboro's top appearance classification; for use when aesthetic appeal is the primary consideration. The finished glulam will still exhibit the natural variation character of the lumber, such as knots and grain.

  • Lumber is pre-graded for sound-tight knots and limited defect
  • Maximum open void of 1/2" on either face or side
  • No filler unless specified
  • Edges eased as specified
  • Wane not permitted
  • Corners eased on wide faces exposed to view
Face Lamination 3-1/8" 3-1/2" 5-1/8" 5-1/2" 6-3/4" 8-3/4" 10-3/4"
Maximum Void 1/2" 1/2" 1/2" 1/2" 1/2" 1/2" 1/2"
Max Sound Knot 1/2" 1/2" 3/4" 3/4" 7/8" 1-1/2" 2"

Framing Appearance

Framing Appearance

Intended for concealed applications and available in widths designed to fit flush with standard wall framing. The Framing appearance standard allows for more irregularities than either Architectural or Industrial appearance standards.

  • Two wide faces are "hit and miss" surfaced
  • Low laminations, glue lines squeeze-out and light wane are permitted
  • Voids are not filled

Industrial Appearance

Industrial Appearance

Used in applications where appearance in not of primary importance, such as industrial and warehouse buildings.

  • Voids on the edges of laminations are not filled
  • Narrow faces of the beam are not surfaced
  • Edges are not eased
  • Occasional misses, low laminations, and light wane are permitted

Textures: Rough Sawn

Rough Sawn Texture

Rosboro's rough sawn texture creates a surface similar to rustic sawn lumber. This texture can be applied to any of the appearance classifications.