[CCMC 12627-R] CCMC Canadian code compliance evaluation

It is the opinion of the Canadian Construction Materials Centre that the evaluated product, when used as structural composite lumber in accordance with the conditions and limitations stated in this evaluation, complies with the following code:

National Building Code of Canada 2015

Ontario Building Code

Ruling No. 05-19-143 (12627-R) authorizing the use of this product in Ontario, subject to the terms and conditions contained in the Ruling, was made by the Minister of Municipal Affairs and Housing on 2006-01-31 (revised 2010-02-17) pursuant to s.29 of the Building Code Act, 1992 (see Ruling for terms and conditions). This Ruling is subject to periodic revisions and updates.

The above opinion(s) is/are based on the evaluation by the CCMC of technical evidence provided by the evaluation holder, and is bound by the stated conditions and limitations. For the benefit of the user, a summary of the technical information that forms the basis of this evaluation has been included.

Product name

TimberStrand®LSL

Product description

The product is laminated strand lumber (LSL), which is a structural composite lumber manufactured from strands of wood species or species combinations blended with an isocyanate-based binder adhesive. The wood species, species combinations, and binder adhesive used are as specified in the Weyerhaeuser "TimberStrand^® LSL Manufacturing Standards." The strands are oriented along the direction parallel to the length of the member. The mats are pressed to the required thickness using a steam injection press. The product is available in thicknesses up to 140 mm, depths up to 1 220 mm, and lengths up to 14.63 m.

The product is treated with zinc borate and may be used within the building envelope (i.e., in protected assemblies) as sill plates over masonry or concrete foundations, footings, or slabs.

Independent, third-party quality assurance monitoring and inspection is conducted by PFS Corporation, Los Angeles, CA, and/or by Intertek Testing Services NA Ltd., Coquitlam, BC.

The permitted design values are outlined in the Technical information section.

Manufacturing plant

This evaluation is valid only for products produced at the following plant:

Product evaluated by the CCMC Indicates that the product from this manufacturing facility has been evaluated by the CCMC

The CCMC’s compliance opinion is bound by this product being used in accordance with the conditions and limitations set out below.

• The product, as with all structural composite lumber, is intended for dry service applications only.^{Footnote (1)}
• The product is intended for use in construction as an alternative material to lumber. Proprietary design values presented for the product are to be used by professional engineers for design in accordance with CSA O86-14, "Engineering Design in Wood," for structural applications such as beams, headers, joists, rafters, studs, and columns, as intended by the product manufacturer. The specific application must be qualified through testing and validated by the manufacturer. Applications such as I-joist flanges and metal-plated truss chords are beyond the scope of this evaluation.
• The product is treated with zinc borate and may be used within the building envelope as sill plates over masonry or concrete foundations, footings, or slabs (AWPA Use Category UC2) as long as the product is not in contact with the ground but may be subjected to dampness.
• The product is considered equivalent to sawn lumber floor joists with respect to its fire-resistance rating for equivalent member size and spacing within a rated floor assembly, including the wood floor assemblies in Table 9.10.3.1.-B, Fire and Sound Resistance of Floors, Ceilings and Roofs, of Division B of the NBC 2015. The product may also be considered equivalent to sawn lumber for use as a firestop material.
• See Appendix B for the conditions and limitations for the use of the product as studs in shear walls.
• The pre-engineered tables in the literature below have been provided to the CCMC by Weyerhaeuser to demonstrate compliance with Part 9, Housing and Small Buildings, of the NBC 2015 for acceptance by the local authority having jurisdiction (AHJ):
  1. Weyerhaeuser's pre-engineered tables^{Footnote (2)}

     When the product is used to support uniform loads only, the installation must be in accordance with the tables and installation details published in the documents by Weyerhaeuser entitled: 

     1. "Beams, Headers, and Columns (TJ-9505) (Limit States Design for Western Canada)," July 2016;
     2. "Beams, Headers, and Columns (TJ-9500) (Limit States Design for Eastern Canada)," October 2017; and
     3. "Select Beam Design Tables (TB-354)," February 2019.
         

     When TimberStrand^® LSL (32 mm thickness) is used as a rim board supporting uniform loads only, the installation must be in accordance with the information and details contained in:

     1. "Technical Bulletin for 1-1/4" Rim Board, TimberStrand LSL (2542)."^{Footnote (3)}

     
     Except where a floor is required to support a concentrated load or a specified unfactored live load in excess of 1.9 kN/m², and in lieu of engineering design, the spans for the product when used as floor joists, rafters, and beams may conform to the spans for Select Structural Grade for the Douglas Fir – Larch (D Fir–L) group in Span Tables 9.23.4.2-A to 9.23.4.2-I of the NBC 2015. Maximum deflections must conform to Subsection 9.4.3., Deflections, of Division B of the NBC 2015. Floor joists must be designed to meet the deflection and vibration criteria set in the NBC 2015 for lumber.

     The product must be installed in accordance with Weyerhaeuser's installation guidelines noted in the above-mentioned documents for those applications falling within the scope of the documents. Applications outside the scope of these installation guidelines require engineering on a case-by-case basis.

  2. Weyerhaeuser's installation details

     Weyerhaeuser’s pre-engineered details within the documents identified as (1), (2), and (3) and outlined in Section i. above are limited in scope to building designs where the anticipated loads on the following structural details are not exceeded:

     • floor and/or snow (plf) tables (pages 6–7 of (2), page 5 of (1));
     • beam installation details (page 12 of (2), page 10 of (1));
     • nails installed on the narrow face (page 13 of (2), page 11 of (1));
     • allowable holes in beams (page 14 of (2), page 12 of (1));
     • tapered end cuts (page 15 of (2), page 13 of (1));
     • multiple-member connections for side-loaded beams (pages 16–17 of (2), pages 14–15 of (1));
     • multiple-member connections for top-loaded beams (page 18 of (2), page 16 of (1));
     • rim board installation details (page 2 of (4)); and
     • vertical load resistance (page 3 of (4)).
  3. Engineering required

     When required by the AHJ or for structural applications beyond the scope/limitations of the above-referenced Weyerhaeuser publications, the drawings or related documents must bear the authorized seal of a professional engineer (or other certified authority approved by the AHJ) who is skilled in wood design and licensed to practise under the appropriate provincial or territorial legislation.

     Installations beyond the scope/limitations of Sections i. and ii. imply, but are not limited to, the following:

     • higher loads/longer spans than the manufacturer's pre-engineered details;
     • concentrated loads;
     • areas of high wind or high seismicity;
     • design of supporting members/columns when the total beam/header load exceeds the NBC 2015 pre-engineered beam/lintel tables; and
     • design of supporting foundation footings when the total load exceeds the NBC 2015 pre-engineered floor/roof joist tables.

     The engineer must design in accordance with CSA O86-14 and may consult the "Engineering Guide for Wood Frame Construction," published by the Canadian Wood Council.

     The specified strengths for the product must not exceed the values set forth in the Technical information section of this evaluation. See Figure 2 for strand orientation with respect to loading.

     The factored resistances of the rim board product are shown in Table 4.

     The ends of all product members used as joists, rafters, and beams must be restrained to prevent rollover. This is normally achieved by attaching a diaphragm sheathing to the top or to the compression edge and to an end wall or shear transfer panel capable of transferring a minimum unfactored uniform load of 730 N/m or the required shear forces due to wind or seismic conditions. Blocking or cross-bracing with the equivalent strength may also be used.

     The compression edges of all product members used as joists, rafters, and beams must be laterally supported at least every 610 mm, except where designed in accordance with CSA O86-14.

     Nailing of the product perpendicular to the wide face of strand (WFS) must conform to Table 9.23.3.4., Nailing for Framing, of Division B of the NBC 2015. Edge nailing of the product parallel to the WFS must conform to Table 2.

  4. Engineering support provided by the manufacturer

     Weyerhaeuser may provide engineering services in conjunction with Weyerhaeuser product specification and offers the following support contact number for its Canadian offices: 888-453-8358.

• This product must be identified with the phrase "CCMC 12627-R" along its side. This CCMC number is only valid when it appears in conjunction with the WH-ETL certification mark of Intertek Testing Services and/or the mark of PFS Corporation. In addition, because the product is treated with zinc borate, it must be further identified with the designations "StrandGuard^®" and "AWPA UC2."

This evaluation is based on demonstrated conformance with the following criteria:

The evaluation holder has submitted technical documentation for the CCMC's evaluation. Testing was conducted at laboratories recognized by the CCMC. The corresponding technical evidence for this product is summarized below.

Design requirements

Table 1. TimberStrand^® LSL specified strengths (MPa)^{Table footnote footnote (1)Table footnote footnote (2)Table footnote footnote (3)}

Grade	Modulus of Elasticity E	Axial – tension parallel to grain FtTable footnote footnote (4)	Axial – compression parallel to grain Fc	Joist or beamTable footnote footnote (1) – flexure FbTable footnote footnote (5)Table footnote footnote (6)	Joist or beamTable footnote footnote (1) – shear Fv	Joist or beamTable footnote footnote (1) – compression perpendicular to grain Fcperp	PlankTable footnote footnote (1) – flexure FbTable footnote footnote (7)	PlankTable footnote footnote (1) – shear Fv	PlankTable footnote footnote (1) – compression perpendicular to grain Fcperp
1.30E	8 965	13.70	20.21	21.65	5.39	8.92	24.20	1.95	7.92Table footnote footnote (8)
1.35E	9 310	15.05	20.94	23.41	5.66	9.39	26.19	1.95	8.27
1.40E	9 655	16.40	21.68	25.18	5.93	9.87	28.18	1.95	8.62
1.45E	9 995	17.75	22.41	26.94	6.19	10.34	30.16	1.95	8.98
1.50E	10 345	19.10	23.14	28.70	6.46	10.81	32.15	1.95	9.33
1.55E	10 685	20.40	23.88	29.60	6.73	11.28	33.30	1.95	9.69
1.60E	11 030	21.65	24.61	30.90	7.00	11.75	34.40	1.95	10.04Table footnote footnote (9)
1.65E	11 375	22.45	25.35	32.03	7.27	12.23	35.68	1.95	10.39
1.70E	11 720	23.25Table footnote footnote (10)	26.08	33.15	7.54	12.70	36.95	1.95	10.75
1.75E	12 065	24.29	26.82	34.66	7.81	13.17	38.70	1.95	11.10
1.80E	12 410	25.33	27.55Table footnote footnote (11)	36.18	8.07Table footnote footnote (12)	13.64Table footnote footnote (13)	40.45	1.95	11.45
1.85E	12 755	26.36	27.55Table footnote footnote (11)	37.69	8.07Table footnote footnote (12)	13.64Table footnote footnote (13)	42.20	1.95	11.81
1.90E	13 100	27.40	27.55Table footnote footnote (11)	39.20	8.07Table footnote footnote (12)	13.64Table footnote footnote (13)	43.95	1.95	12.16
1.95E	13 445	28.51	27.55Table footnote footnote (11)	40.55	8.07Table footnote footnote (12)	13.64Table footnote footnote (13)	45.46	1.95	12.52
2.00E	13 790	29.63	27.55Table footnote footnote (11)	41.90	8.07Table footnote footnote (12)	13.64Table footnote footnote (13)	46.98	1.95	12.87
2.05E	14 135	30.74	27.55Table footnote footnote (11)	43.25	8.07Table footnote footnote (12)	13.64Table footnote footnote (13)	48.49	1.95	13.22
2.10E	14 480	31.85	27.55Table footnote footnote (11)	44.60	8.07Table footnote footnote (12)	13.64Table footnote footnote (13)	50.00	1.95	13.58

Table 2. TimberStrand^® LSL fastener detail: all grades

Fastener property	Nail orientation	Load direction	Specific gravity (SG) of equivalent species for design purposes
Nail withdrawal	Edge	Withdrawal	Spruce-Pine-Fir, SG = 0.42
Nail withdrawal	Face	Withdrawal	Douglas Fir-Larch, SG = 0.50
Lateral nail capacity	Edge	Parallel to grain	Douglas Fir-Larch, SG = 0.50
Lateral nail capacity	Edge	Perpendicular to grain	Douglas Fir-Larch, SG = 0.50
Lateral nail capacity	Face	Parallel to grain	Douglas Fir-Larch, SG = 0.50
Lateral nail capacity	Face	Perpendicular to grain	Douglas Fir-Larch, SG = 0.50
Bolt bearing capacity	—	Parallel to grain	Douglas Fir-Larch, SG = 0.50
Bolt bearing capacity	—	Perpendicular to grain	Douglas Fir-Larch, SG = 0.50
	Bolt size	Load direction	Specified strength (N)
Lag screw capacity	12.7 mm	Parallel to grain	2 820Footnote (1)
Lag screw capacity	12.7 mm	Perpendicular to grain	2 820Footnote (1)

Table 3. Nail spacing requirements for TimberStrand^® LSL

Closest on centre nail spacing parallel to the wide face of strand (WFS) orientation (mm)Footnote (1) Footnote (2)
Common nail size	Nominal member thickness (mm)
	32		38		44.5–89			89
	1 row	2 rows	1 row	2 rows	1 row	2 rows	3 rows	3 rows
63.5 mm × 3.33 mm	102	102	76	76	76	76	76	76
76 mm × 3.75 mm	102	102	76	76	76	76	76	76
89 mm × 4.11 mm	152Footnote (3)	152Footnote (3)	152Footnote (3)	152Footnote (3)	152Footnote (4)	152Footnote (4)	152Footnote (4)	152Footnote (4)

Table 4. TimberStrand^® LSL 1.3E rim board: factored vertical load resistance values^{Footnote (1)}

Nominal thickness (mm)	Limit states design – factored vertical load resistanceFootnote (2) (kN/m)	Depth range (mm)
32Footnote (3)	98.20	≤ 406
32Footnote (3)	79.75	> 406, ≤ 508
38	95.65	≤ 610

Table 5. TimberStrand^® LSL stud and shearwall applications^{Footnote (1) Footnote (2)}

TimberStrand® LSL grade	NailingFootnote (3) Footnote (4)	Equivalent species for framing material
GradeFootnote (5) < 1.5E	Panel edge nailing of 150 mm	Spruce-Pine-Fir
1.5E ≤ Grade < 1.6E	Panel edge nailing of 75 mmFootnote (6) to 150 mm	Spruce-Pine-Fir
1.6E ≤ Grade ≤ 1.7E	Panel edge nailing of 75 mm to 150 mm	Douglas Fir-Larch