Glulam Wood, Appearance and Finish Options: Part 1

Una-Lam offers a variety of options which affect the finished appearance, strength, and longevity of our glulam products – from raw materials to coatings.  Here is an overview of the variables that should be specified for your next glulam job.

Raw Materials
Wood Species
Southern Yellow Pine (SYP) makes up the majority of Una-Lam's work.  It is our material of choice for economy and strength – and highly recommended for curved members.
Douglas Fir, Alaska Yellow Cedar, Red Maple, and other species are also available.
  
Treated Lumber
For glulam members exposed to weather or harsh indoor environments, Una-Lam offers CCA and Penta treated material.  Partially exposed members can even be fabricated with treated and non-treated zones.

Forest Stewardship Council Certification
Una-Lam is Forest Stewardship Council (FSC) chain-of-custody certified, making us the right choice for LEED certified projects.  FSC material must be specified.


Appearance Grades
Appearance grade refers to visible knots and defects on the wood surface.  One of the following grades should be specified:

AITC Premium – For jobs where appearance is of critical importance.  Allows only very small knots and voids on exposed surfaces.  Any other voids and defects are plugged with clear wood inserts, not just wood filler.

AITC Architectural – The most common appearance grade for Una-Lam jobs.  Ideal for exposed projects, where the appearance of natural knots and small voids in the wood is acceptable.  Any other voids and defects are plugged with clear wood inserts, not just wood filler.

AITC Industrial – For projects where glulam will be hidden from view or appearance is not critical.  Sides of members are planed, but voids or other defects on the edges of laminations are not repaired.

Tune in next week for more finish options.

You can view our other technical notes by clicking on the links below:
Technical Notes: Straight Glulam Beams
Technical Notes: Curved Glulam Beams
Glulam Wood, Appearance and Finish Options: Part 2