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TONGUE & GROOVE | GRADES
Tongue and groove siding is
available with rough or smooth faces. Both
seasoned (kiln-dried) and unseasoned (green)
sidings are available.
The joints between adjoining pieces are usually v-shaped but flush jointed, reveal and radius joints are also available. The different joints and surface textures in tongue and groove siding combine to provide a range of shadow line effects that enhance the product's versatility.
Clear Grades
| Clear Heart |
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The highest grade. Includes only
pieces with heartwood on the exposed
face. Many pieces completely clear,
others have minor imperfections that
do not detract from their fine appearance.
Grading Paragraph
NLGA 200a
WCLIB 102-b
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| A Clear* |
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Permits somewhat more imperfections
than Clear Heart but the grade is
still restricted to pieces with excellent
appearance.
*Common specifications are A and
Better and A and Better with a percentage
of B grade allowed.
Grading Paragraph
NLGA 200b
WCLIB 102-c
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| B Clear |
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Permits slightly larger and more
numerous characteristics than A grade
and occasional pieces may require
trimming to yield high grade pieces
in shorter lengths. Most often supplied
as a percentage with A grade.
Grading Paragraph
NLGA 200c
WCLIB 102-d
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NLGA - National Lumber Grades Authority
WCLIB - West Coast Lumber Inspection Bureau
Knotty Grades
| Select Knotty |
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Available kiln dried or unseasoned. Knots are sound and tight.
Grading Paragraph
NLGA 204a
WCLIB 111-e
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| Quality Knotty |
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In this grade, natural growth characteristics are not limited as stringently as in Select Knotty. Cross cutting may be required on some pieces to yield tight knotted siding.
Grading Paragraph
NLGA 204b
WCLIB 111-f
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| Proprietary Grades |
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Designed to meet appearance requirements for cedar sidings and trim. Ask your WRCLA distributor for details.
*Manufacturers may market their own proprietary grades.
Grading Paragraph
NLGA n/a
WCLIB n/a
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| Standard and Better |
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Suitable for exterior construction. Occasional pieces may require trimming to yield suitable quality for the intended end use.
Grading Paragraph
NLGA 114a, b, c
WCLIB 118-a, b, c
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NLGA - National Lumber Grades Authority
WCLIB - West Coast Lumber Inspection Bureau |
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