[CCMC evaluation requirements] ANSI/APA PRR 410-2021, Grade A

From: National Research Council Canada

This document provides a summary of the minimum requirements imposed by the Canadian Construction Materials Centre (CCMC) for all evaluations based on the below criteria document. Additional requirements may be imposed by the CCMC when necessary for a particular evaluation, and are detailed in the individual evaluation.

Criteria document


These evaluations are in accordance with ANSI/APA PRR 410-21, "Standard for Performance-Rated Engineered Wood Rim Boards." The standard applies to products manufactured from either structural-use panels sawn into rim board dimensions, re-sawn structural glued laminated timber, or structural composite lumber manufactured specifically to meet the performance requirements of rim boards in wood-frame construction.

Grade A rim boards meeting the requirements of ANSI/APA PRR 410 have a thickness-based rim board grade of 31.8 mm (1-¼ in.) thick or higher.

The maximum depth of these rim boards is 610 mm (24 in.).

In accordance with structural performance criteria, “APA Rim Board Plus” is equivalent to Grade A rim boards as listed in Table 2.

The rim boards are intended for use in engineered wood joist floor assemblies in dry service conditions only (i.e., conditions where the mean equilibrium moisture content of solid-sawn lumber is less than 16%). The rim boards are manufactured to meet ANSI/APA PRR 410 and are subject to a third-party certification program accredited by the Standards Council of Canada.

Material requirements

The evaluation holder must demonstrate that the product meets the following requirements (additional requirements may be imposed by the CCMC when necessary, and are detailed in the individual evaluation):

The standard prescriptive and performance requirements are summarized below. This standard addresses the following aspects:

  1. Dimensions and dimensional tolerances;
  2. Structural performance
    1. Horizontal load transfer capacity;
    2. Uniform vertical load capacity;
    3. 12.7-mm-diameter (1/2 in.) lag screw lateral resistance;
    4. Concentrated vertical load capacity;
    5. Edge nailing durability; and
    6. Physical properties (not applicable to plywood panels, laminated veneer lumber, or glulam materials):
      1. Thickness swell;
      2. Density;
      3. Internal bond.

Dimensions and dimensional tolerances

Table 1. Dimensions and dimensional tolerances - Grade A
Performance category Thickness (mm (in.)) Maximum depth (mm (in.)) Depth toleranceTable footnote (1)Table footnote (2) (mm (in.)) Minimum thicknessTable footnote (3) (mm (in.)) Maximum thickness (mm (in.))
31.8 (1-1/4) 31.8 (1-1/4) 610 (24) +3.2 (+1.8)
−0 (−0)
30.16 (1.188) 33.34 (1.313)


Structural performance

The horizontal load transfer capacity, uniform vertical load capacity, 12.7-mm-diameter (1/2 in.) lag screw lateral resistance, and concentrated vertical load capacity must meet the required mean test values specified in ANSI/APA PRR 410. The design values outlined in Table 2 apply only to engineered wood rim boards meeting the minimum structural performance specified in ANSI/APA PRR 410. Table 2 outlines the design values for engineered buildings. These factored resistance values for limit states design are soft-converted from the allowable working stress design values.

To determine the factored resistances, tests are carried out in accordance with the standard, which also specifies sample preparation. All the samples are assembled and nailed in accordance with the nailing schedule shown in Table 3, which complies with the NBC 2015 requirements.


Table 2. Factored resistancesTable 2fn0-rf" footnote (1) for performance-rated engineered wood rim boards used in CanadaTable footnote (2) - Grade A
Performance categoryTable footnote (3) Depth limitations(5) (mm)

φHTable footnote (4)


φVTable footnote (5)


φZTable footnote (6)


φPTable footnote (7)


d ≤ 610 241.3 301.6 355.6 406.4 457.2 508 558.8 609.6 d ≤ 610 d ≤ 610
31.8 mm of higher 4.26 114.32 144.32 114.32 109.03 98.45 87.86 77.28 67.74 2.60 22.57


The nailing schedule in Table 3 was used to prepare the samples to test for the structural performance criteria. It is also the nailing schedule required by the NBC 2015 and should be followed during field installation. Figure 1 graphically displays the nailing requirements.


Table 3. Nailing schedule for performance-rated engineered wood rim boards for use in CanadaTable footnote (1)
Sheathing to rim board or joistTable footnote (2) Bottom plate through sheathing to rim board Rim board to sill plates (toe nail) Joist to sill plate (slanted) Rim board to joist
51 mm (6d) common @ 150 mm o.c. (6 in. o.c.)Table footnote (3) or 63.5 mm (8d) common @ 150 mm o.c. (6 in o.c.)Table footnote (4) 82 mm (12d) common @ 400 mm (15.7 in. o.c.) or 82 mm (12d) common @ 150 mm (6 in. o.c.)Table footnote (5) 82 mm (12d) common @ 150 mm (6 in. o.c.) 2 × 63.5 mm (8d) common 2 × 63.5 mm (8d) common


Typical installation for performance-rated engineered wood rim board

Figure 1. Typical installation for performance-rated engineered wood rim board

  1. rim board
  2. 63.5 mm nails in centre of top and bottom flanges
  3. toe nail as per manufacturer’s instructions (typ. 82 mm at 150 mm o.c.)
  4. 82 mm at 400 mm o.c. (or 82 mm at 150 mm o.c.)
  5. 51 mm or 63.5 mm at 150 mm o.c.
  6. slanted nail I-joist as per manufacturer’s instructions (typ. 2 × 63.5 mm)

Edge nailing durability criteria

The mean edge nailing durability of the conditioned samples must be at least 75% of the mean horizontal load transfer capacity of the unconditioned samples.

Physical properties (not applicable to plywood panels, laminated veneer lumber or glulam material)

After conditioning, the mean thickness swell must not exceed 10% and the thickness swell of individual samples must not exceed 12%. The density values and internal bond measurements are used to establish quality control values for the quality assurance use.

Vapour barrier

A 15 ng/(Pa∙s∙m2) vapour barrier must be installed on the interior side to address the requirements of Article, Vapour barrier materials, and subsection 9.25.5., properties and position of materials in the building envelope, of Division B of the NBC 2020.

Engineering support

Engineering support for performance-rated engineered wood rim boards is provided by either the third-party certification agency or by the manufacturer. Check the product listing for engineering support contact information.

© American National Standards Institute. This information is reproduced from the referenced standard published by the American National Standards Institute (ANSI). The full version of the Standard should be referenced, and can be obtained from ANSI.

Installation requirements

The CCMC requires that evaluation holders provide instructions for the installation of the product(s) that:

Manufacturing requirements

The CCMC requires that evaluation holders, at a minimum, demonstrate that the associated production process:

Labelling requirements

The CCMC requires that evaluation holders ensure that product labels:

All performance-rated engineered wood rim boards must be labelled with the following information:

  • Rim Board Grade qualified in accordance with ANSI/APA PRR 410;
  • the performance category;
  • the labelled rim board thickness;
  • the mill name or identification number;
  • the qualified agency name or logo;
  • the symbol of “ANSI/APA PRR 410” signifying conformance to the standard;
  • any manufacturer designations, which must be separated from the grade marks or trademarks of the qualified agency by not less than 152 mm (6 in.); and
  • the CCMC Listing number.

Classification information

Products falling within the scope of this document are commonly classified by:


  • 06 10 00 Rough Carpentry
  • 06 17 00 Shop-Fabricated Structural Wood
  • 06 17 43 Rim Boards

Published CCMC evaluations

The following products have been evaluated to these requirements by the CCMC:

CCMC number:Manufacturer:Product names:
13248-LAPA – The Engineered Wood Association West Fraser Rimboard Grade B2, West Fraser Rimboard Grade C1, West Fraser Rimboard Grade C2, West Fraser Rimboard Grade A, West Fraser Rimboard Grade B1

Code references

This standard is not referenced in the National Building Code of Canada
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