Glulam
Appearance Upgrades |
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Structural
Wood Corporation offers a
variety of appearance options ranging from Industrial to Premium with
optional stain and varnish protection. First, let us explain the
different appearance grades. The grades specified below apply only to
appearance, not to strength.
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Industrial
As Is
Application:
This use should be
considered where appearance is not an issue such as in industrial
buildings, storage buildings, or where they are strictly for framing
and may be hidden.
Description:
While
the sides are planed to specified dimensions, occasional misses and
rough spots are allowed. They may have broken knots, knot holes, torn
grain and other irregularities on the surface.
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Industrial
Clean
Application:
Industrial appearance grade is ordinarily suitable for construction in
industrial plants, warehouses, garages, and for other uses where
appearance is not of primary concern.
Description:
Laminations may possess the natural growth characteristics of the
lumber grade.
Voids appearing on the edge of laminations need not be filled.
Edge joints appearing on the wide face of laminations exposed to view
need not be filled.
Members are required to be surfaced on two sides only. Occasional
misses, low laminations, or wane (limited to a maximum of 1/4" measured
across the width) are permitted on a cumulative basis.
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Architectural
Grade
Application:
Architectural appearance grade is ordinarily suitable for construction
where appearance is an important requirement.
Any voids under 3/4" in
diameter shall be filled by other than the fabricator if the final
decorative finish so requires.
Description:
Laminations may possess the natural growth characteristics of the
lumber grade.
In exposed surfaces, knot holes and other voids measuring over 3/4"
shall be filled by the fabricator with a wood-tone colored filler which
reasonably blends with the final product or with clear wood inserts.
When inserts are used, they shall be selected with reasonable care for
similarity of the grain and color of the wood insert to the adjacent
wood.
The wide face of laminations exposed to view shall be free of loose
knots. Open knot holes shall be filled. Voids greater than 1/16" wide
in edge joints appearing on the wide face of laminations exposed to
view shall be filled.
Exposed faces shall be surfaced smooth. Misses are not permitted.
The corners of the wide face of laminations exposed to view in the
final structure shall be eased. Current industry practice for eased
edges is for a radius between 1/8" and 1/2" Other radii for eased edges
may be agreed upon between buyer and seller.
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Premium
Grade
Application:
Premium appearance grade is the highest standard appearance grade.
Description:
Laminations may possess the natural growth characteristics of the
lumber grade.
In exposed surfaces, knot holes and other voids shall be filled by the
fabricator with a wood-tone colored filler which reasonably blends with
the final product or with clear wood inserts. When inserts are used,
they shall be selected with reasonable care for similarity of the grain
and color of the wood to the adjacent wood.
The wide face of laminations exposed to view shall be selected for
appearance and shall be free of loose knots. Voids shall be filled.
Knot size shall be limited to 20% of the net face width of the
lamination. Not over two maximum size knots or their equivalent shall
occur in a 6 ft length. Voids greater than 1/16" wide in edge joints
appearing on the wide face of laminations exposed to view shall be
filled.
Exposed faces shall be surfaced smooth. Misses are not permitted.
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