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[CCMC 13125-R] CCMC Canadian code compliance evaluation

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Compliance opinion

It is the opinion of the Canadian Construction Materials Centre that the evaluated products, when used as both exterior decking and as stair treads in accordance with the conditions and limitations stated in this evaluation, comply with the following codes:

National Building Code of Canada 2015

ID Code provision Solution type
09-03-02-09-00-0-009.3.2.9. Termite and Decay ProtectionAlternative
09-04-02-03-00-0-009.4.2.3. Platforms Subject to Snow and Occupancy LoadsAlternative
09-04-03-01-00-0-009.4.3.1. DeflectionsAlternative
09-08-09-01-00-0-009.8.9.1. Loads on Stairs and RampsAlternative
09-23-15-05-00-0-009.23.15.5. Subfloor Thickness or RatingAlternative

National Building Code of Canada 2020

ID Code provision Solution type
09-03-02-09-00-0-009.3.2.9. Termite and Decay ProtectionAlternative
09-04-02-03-00-0-009.4.2.3. Platforms Subject to Snow and Occupancy LoadsAlternative
09-04-03-01-00-0-009.4.3.1. DeflectionsAlternative
09-08-09-01-00-0-009.8.9.1. Loads on Stairs and RampsAlternative
09-23-15-05-00-0-009.23.15.5. Subfloor Thickness or RatingAlternative

Ontario Building Code

Ruling No. 04-09-113 (13125-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 2004-07-20 (revised 2015-04-24) 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 information

Product names

  • Trex® Select® Decking
  • Trex® Transcend® Decking

Product description

The products are a wood thermoplastic composite lumber (WTCL) made primarily from equal parts of reclaimed hardwood sawdust and reclaimed/recycled low-density polyethylene. The composite products are manufactured through a continuous extrusion process into planks of grooved or solid cross-sections. Trex® Transcend® Decking is available in 24 mm × 140 mm and 33 mm × 140 mm cross-sections, and Trex® Select® Decking is available in 21 mm × 140 mm and 33 mm × 140 mm cross-sections. They are available in lengths of 365 cm, 487 cm and 609 cm.

The products are intended to be used as exterior decking installed over traditional structural wood framing, spaced in accordance with the following: 

Table 1. Joist and stair stringer spacing
Profile Thickness Joist spacing Stringer spacing
Trex® Select® Decking 21 mm 400 mm on centre (o.c.) 200 mm o.c.
Trex® Transcend® Decking 24 mm 400 mm o.c. 230 mm o.c.
Trex® Transcend® Decking 33 mm 600 mm o.c. 250 mm o.c.
Trex® Select® Decking 33 mm 600 mm o.c. 250 mm o.c.

 

Isometric profile drawing of the Trex® Transcend® Decking deck boards.

Figure 1. Installation details for the products with exposed fasteners

  1. 4 mm to 8 mm minimum spacing between ends of the planks, depending on the length of the plank and temperature at installation
  2. Trex® Transcend® Decking and Trex® Select® Decking
  3. 5 mm spacing between sides of the planks for all installations
  4. Minimum of three joists per plank
  5. Maximum joist spacing of 400 mm or 600 mm o.c.
  6. Joist designed to support applicable loads
  7. Two 64-mm-long or 70-mm-long fasteners per plank at each intersecting joist
Isometric profile drawing of the installation of the deck boards.

Figure 2. Installation details for the products with hidden fasteners

  1. 4 mm to 8 mm minimum end-to-end gapping, depending on length of plank and temperature at installation
  2. 5 mm minimum width-to-width gapping, for all installations
  3. Minimum of three joists per plank
  4. Maximum joist spacing of 400 mm or 600 mm o.c.
  5. Joist designed to support applicable loads
Dimensions of the Trex Transcend Square-Edge profile

Figure 3. Trex® Transcend® square-edge profile

  1. 140 mm (5.50 in.)
  2. 24 mm (0.94 in.) or 33 mm (1.30 in.)
Dimensions of the Trex Transcend Groove-Edge profile

Figure 4. Trex® Transcend® groove-edge profile

  1. 140 mm (5.50 in.)
  2. 24 mm (0.94 in.)
Dimensions of the Trex Select Solid-Edge profile

Figure 5. Trex® Select® solid-edge profile

  1. 140 mm (5.50 in.)
  2. 21 mm (0.81 in.) or 33 mm (1.30 in.)
Dimensions of the Trex Select Groove-Edge profile

Figure 6. Trex® Select® groove-edge profile

  1. 140 mm (5.50 in.)
  2. 21 mm (0.81 in.)

Manufacturing plants

This evaluation is limited to products produced at the following plants:

Product namesManufacturing plants
Fernley, NV, USWinchester, VA, US
Trex® Select® DeckingProduct evaluated by the CCMCProduct evaluated by the CCMC
Trex® Transcend® DeckingProduct evaluated by the CCMCProduct evaluated by the CCMC

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

  Conditions and limitations

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

  • The 21-mm- and 24-mm-thick products must be installed with supports spaced no greater than 400 mm on centre (o.c.). The 33-mm-thick products must be installed with supports spaced no greater than 600 mm o.c. Each plank must be supported by at least three joists.
  • When used as stair treads, the products must be installed with supports spaced no greater than 200 mm for the 21-mm-thick planks, 230 mm for the 24-mm-thick planks, and 250 mm for the 33-mm-thick planks.
  • The products must be fastened to the wood joists with fasteners specified by the manufacturer and conforming to Article 9.23.3.1., Standards for Nails and Screws, of Division B of the NBC 2015 and the NBC 2020. The fasteners must have a corrosion-resistant coatingFootnote (1) or be made of stainless steel. The planks must be fastened with at least two fasteners per joist and the fasteners must be at least 64 mm long.
  • The products must not be installed below –9°C.
  • The products must be gapped end to end, based on the length of the plank and the temperature at installation, in accordance with the manufacturer's recommendations. The end-to-end gapping must be:
    • 8 mm for installations below 3°C;
    • 6 mm for installation between 3°C and 15°C; and
    • 4 mm for installations above 15°C.
  • The width-to-width gapping must be 5 mm for all installations.
  • The products can be used where termite protection is required in accordance with Sentence 9.3.2.9.(1)(b), Termite and Decay Protection, of Division B of the NBC 2015 and the NBC 2020.
  • The products are not to be considered as an equivalent to dimensional lumber.
  • The products are permitted where decay resistance is required in accordance with Sentence 9.3.2.9.(3) of Division B of the NBC 2015 and the NBC 2020.
  • Slip-resistant strips must be provided in accordance with Article 9.8.9.6., Finish for Treads and Landings, of Division B of the NBC 2015 and the NBC 2020. 

  Technical information

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

Evaluation requirements
Criteria number Criteria name
CCMC-TG-067314.01-15CCMC Technical Guide for Wood Thermoplastic Composite Lumber Exterior Decking
CCMC-TG-067314.01-20CCMC Technical Guide for Wood Thermoplastic Composite Lumber Exterior Decking

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.

Material requirements 

Table 2. Results of testing of basic physical and mechanical properties
Property Unit Requirement ResultTable footnote (1)Table footnote (2)
Dimensional change - coefficient of linear expansion (thermal) - longitudinal cm/cm/°C < 2×10–5 2.7×10–5Table footnote (3)
Dimensional change - coefficient of linear expansion (swelling) - oven-dry to vacuum pressure soak % ≤ 0.5, by 80% of specimens –0.37
Strength and stiffness - modulus of elasticity (MOE) - span-to-depth ratio within 18 to 21 - Trex® Select® Decking (21 mm) MPa ≥ 750 2 670
Strength and stiffness - MOE - span-to-depth ratio within 18 to 21 - Trex® Transcend® Decking (24 mm) MPa ≥ 750 2 711
Strength and stiffness - MOE - span-to-depth ratio within 18 to 21 - Trex® Transcend® Decking and Trex® Select® Decking (33 mm) MPa ≥ 750 2 942
Strength and stiffness - modulus of rupture (MOR) - span-to-depth ratio within 18 to 21 - Trex® Select® Decking (21 mm) MPa ≥ 9 25.09
Strength and stiffness - MOR - span-to-depth ratio within 18 to 21 - Trex® Transcend® Decking (24 mm) MPa ≥ 9 24.53
Strength and stiffness - MOR - span-to-depth ratio within 18 to 21 - Trex® Transcend® Decking and Trex® Select® Decking (33 mm) MPa ≥ 9 26.10
Impact resistance - Izod impact, notched J/m > 53.4 93.1
Hardness - 11.28-mm-diameter ball kN > 1.8 9.1
Creep, recovery and load duration Trex® Select® Decking (21 mm) % ≤ 25 for creep 43.0Table footnote (4)
Creep, recovery and load duration Trex® Select® Decking (21 mm) % ≥ 75 for recovery 78.3
Creep, recovery and load duration Trex® Select® Decking (21 mm) - No failure Pass
Creep, recovery and load duration Trex® Transcend® Decking (24 mm) % ≤ 25 for creep 40.5Table footnote (4)
Creep, recovery and load duration Trex® Transcend® Decking (24 mm) % ≥ 75 for recovery 79.6
Creep, recovery and load duration Trex® Transcend® Decking (24 mm) - No failure Pass
Creep, recovery and load duration Trex® Transcend® Decking and Trex® Select® Decking (33 mm) % ≤ 25 for creep 41.1Table footnote (4)
Creep, recovery and load duration Trex® Transcend® Decking and Trex® Select® Decking (33 mm) % ≥ 75 for recovery 80.2
Creep, recovery and load duration Trex® Transcend® Decking and Trex® Select® Decking (33 mm) - No failure Pass
Strength and stiffness after aging - weathering - impact resistance % ≥ 75 of non-weathered value 93.1
Strength and stiffness after aging - accelerated aging - MOE - Trex® Select® Decking (21 mm) % ≥ 50 of non-aged value 81.1
Strength and stiffness after aging - accelerated aging - MOE - Trex® Transcend® Decking (24 mm) % ≥ 50 of non-aged value 88.2
Strength and stiffness after aging - accelerated aging - MOE - Trex® Transcend® Decking and Trex® Select® Decking (33 mm) % ≥ 50 of non-aged value 98.1
Strength and stiffness after aging - accelerated aging - MOR - Trex® Select® Decking (21 mm) % ≥ 50 of non-aged value 97.7
Strength and stiffness after aging - accelerated aging - MOR - Trex® Transcend® Decking (24 mm) % ≥ 50 of non-aged value 90.1
Strength and stiffness after aging - accelerated aging - MOR - Trex® Transcend® Decking and Trex® Select® Decking (33 mm) % ≥ 50 of non-aged value 86.7
Fastener holding capacity - nail withdrawal strength N ≥ 600 2 822
Fastener holding capacity - lateral nail strength N ≥ 720 3 301
Hidden fastener holding capacity - nail withdrawal strength N ≥ 600 956
Hidden fastener holding capacity - lateral nail strength N ≥ 720 1 486

 

Table 3. Results of testing of decay, termite and slip-resistance properties of the products
Property Requirement Result
Decay resistance - % loss in weight Mean percentage loss in weight after exposure to decay-causing fungi must be equal to or better than preservative-treated wood conforming to CAN/CSA-O80.1-08, “Specification of treated wood” Passed
Decay resistance - % loss compressive strength Mean percentage loss in compressive strength after exposure to decay-causing fungi must be equal to or better than preservative-treated wood conforming to CAN/CSA-O80.1 Passed
Termite resistance Rating must be equal to or better than preservative-treated wood conforming to CAN/CSA-O80.1 Passed
Slip resistance (longitudinal) - wet condition - Trex® Transcend® Decking Slip coefficient ≥ 0.5 0.38Table footnote (1)
Slip resistance (transverse) - wet condition - Trex® Transcend® Decking Slip coefficient ≥ 0.5 0.44Table footnote (1)
Slip resistance (longitudinal) - wet condition - Trex® Select® Decking Slip coefficient ≥ 0.5 0.43Table footnote (1)
Slip resistance (transverse) - wet condition - Trex® Select® Decking Slip coefficient ≥ 0.5 0.51
Slip resistance (longitudinal) - dry condition - Trex® Transcend® Decking Slip coefficient ≥ 0.5 0.48Table footnote (1)
Slip resistance (transverse) - dry condition - Trex® Transcend® Decking Slip coefficient ≥ 0.5 0.55
Slip resistance (longitudinal) - dry condition - Trex® Select® Decking Slip coefficient ≥ 0.5 0.63
Slip resistance (transverse) - dry condition - Trex® Select® Decking Slip coefficient ≥ 0.5 0.69

Performance requirements 

Table 4. Results of testing of performance under both concentrated static loads and impact loads
Property Unit Requirement ResultTable footnote (1)
Concentrated static load - decking at 50°C - minimum ultimate load - Trex® Select® Decking (21 mm) kN ≥ 2.45 2.72
Concentrated static load - decking at 50°C - minimum ultimate load - Trex® Transcend® Decking (24 mm) kN ≥ 2.45 3.26
Concentrated static load - decking at 50°C - minimum ultimate load - Trex® Transcend® Decking and Trex® Select® Decking (33 mm) kN ≥ 2.45 4.28
Concentrated static load - decking at 20°C - minimum ultimate load - Trex® Select® Decking (21 mm) kN ≥ 2.45 3.92
Concentrated static load - decking at 20°C - minimum ultimate load - Trex® Transcend® Decking (24 mm) kN ≥ 2.45 4.62
Concentrated static load - decking at 20°C - minimum ultimate load - Trex® Transcend® Decking and Trex® Select® Decking (33 mm) kN ≥ 2.45 6.05
Concentrated static load - decking at –35°C - minimum ultimate load - Trex® Select® Decking (21 mm) kN ≥ 2.45 5.79
Concentrated static load - decking at –35°C - minimum ultimate load - Trex® Transcend® Decking (24 mm) kN ≥ 2.45 6.72
Concentrated static load - decking at –35°C - minimum ultimate load - Trex® Transcend® Decking and Trex® Select® Decking (33 mm) kN ≥ 2.45 8.56
Concentrated static load - decking at 50°C - maximum deflection under 0.89-kN load - Trex® Select® Decking (21 mm) mm ≤ 2.0 5.3Table footnote (2)
Concentrated static load - decking at 50°C - maximum deflection under 0.89-kN load - Trex® Transcend® Decking (24 mm) mm ≤ 2.0 4.6Table footnote (2)
Concentrated static load - decking at 50°C - maximum deflection under 0.89-kN load - Trex® Transcend® Decking and Trex® Select® Decking (33 mm) mm ≤ 2.8 4.8Table footnote (2)
Concentrated static load - decking at 20°C - maximum deflection under 0.89-kN load - Trex® Select® Decking (21 mm) mm ≤ 2.0 3.05Table footnote (3)
Concentrated static load - decking at 20°C - maximum deflection under 0.89-kN load - Trex® Transcend® Decking (24 mm) mm ≤ 2.0 2.3Table footnote (3)
Concentrated static load - decking at 20°C - maximum deflection under 0.89-kN load - Trex® Transcend® Decking and Trex® Select® Decking (33 mm) mm ≤ 2.8 2.5
Concentrated static load - decking at –35°C - maximum deflection under 0.89-kN load - Trex® Select® Decking (21 mm) mm ≤ 2.0 3.2Table footnote (3)
Concentrated static load - decking at –35°C - maximum deflection under 0.89-kN load - Trex® Transcend® Decking (24 mm) mm ≤ 2.0 3.4Table footnote (3)
Concentrated static load - decking at –35°C - maximum deflection under 0.89-kN load - Trex® Transcend® Decking and Trex® Select® Decking (33 mm) mm ≤ 2.8 2.8
Following impact load of 102 N·m - decking at 50°C - minimum ultimate load kN ≥ 1.78 No break
Following impact load of 102 N·m - decking at 50°C - maximum deflection under 0.89-kN load - Trex® Select® Decking (21 mm) mm ≤ 2.0 9.0
Following impact load of 102 N·m - decking at 50°C - maximum deflection under 0.89-kN load - Trex® Transcend® Decking (24 mm) mm ≤ 2.0 6.9Table footnote (2)
Following impact load of 102 N·m - decking at 50°C - maximum deflection under 0.89-kN load - Trex® Transcend® Decking and Trex® Select® Decking (33 mm) mm ≤ 2.8 8.9Table footnote (2)

 

Table 5. Results of testing of durability
Property Requirement Result - S-P-F lumber Result - Trex® Transcend® Decking and Trex® Select® Decking
Bending stiffness Mean percentage loss in bending stiffness (MOE) after ultraviolet (UV) exposure Table footnote (1) and accelerated aging Table footnote (2) must be less than or equal to spruce lumber 58% 15.5%
Bending strength Mean percentage loss in bending stress (MOR) after UV exposureTable footnote (1) and accelerated aging Table footnote (2) must be less than or equal to spruce lumber 68% 13.1%

 

Table 6. Results of testing of performance under concentrated static load - stair tread
Property Unit Requirement ResultTable footnote (1)
Concentrated static load - stair tread - minimum ultimate load - Trex® Select® Decking (21 mm) kN ≥ 5Table footnote (2) 7.0
Concentrated static load - stair tread - minimum ultimate load - Trex® Transcend® Decking (24 mm) kN ≥ 5Table footnote (2) 6.0
Concentrated static load - stair tread - minimum ultimate load - Trex® Transcend® Decking and Trex® Select® Decking (33 mm) kN ≥ 5Table footnote (2) 10.1
Concentrated static load - stair tread nosing - minimum ultimate load - Trex® Select® Decking (21 mm) kN ≥ 5Table footnote (3) 6.7
Concentrated static load - stair tread nosing - minimum ultimate load - Trex® Transcend® Decking (24 mm) kN ≥ 5Table footnote (3) 6.7
Concentrated static load - stair tread nosing - minimum ultimate load - Trex® Transcend® Decking and Trex® Select® Decking (33 mm) kN ≥ 5Table footnote (3) 6.7
Concentrated static load - stair tread - maximum deflection under 1 kN - Trex® Select® Decking (21 mm) mm ≤ 0.75 2.42Table footnote (4)
Concentrated static load - stair tread - maximum deflection under 1 kN - Trex® Transcend® Decking (24 mm) mm ≤ 0.75 3.13Table footnote (5)
Concentrated static load - stair tread - maximum deflection under 1 kN - Trex® Transcend® Decking and Trex® Select® Decking (33 mm) mm ≤ 0.75 2.6Table footnote (6)

Additional performance data

Data in this section does not form part of the CCMC’s opinion. 

Table 7. Results of testing of additional performance data - flame-spread rating
Property Unit Reference value Result
Flame-spread rating - ≤ 200 90
Smoke development - Report value 415 

 

Table 8. Results of testing of additional performance data - hidden fastening system after aging
Property
Unit

Requirement
ResultTable footnote (1)
Fastener holding capacity after aging at 50°C - hidden fastening system - retained nail withdrawal strength - Trex® Transcend® Decking % Report value 77.6Table footnote (2)
Fastener holding capacity after aging at 50°C - hidden fastening system - retained nail withdrawal strength - Trex® Select® Decking % Report value 69.6Table footnote (2)
Fastener holding capacity after aging at 50°C - hidden fastening system - retained lateral nail strength - Trex® Transcend® Decking % Report value 86.3
Fastener holding capacity after aging at 50°C - hidden fastening system - retained lateral nail strength - Trex® Select® Decking % Report value 76.7Table footnote (2)
Fastener holding capacity after aging at –35°C - hidden fastening system - retained nail withdrawal strength - Trex® Transcend® Decking % Report value 110.0
Fastener holding capacity after aging at –35°C - hidden fastening system - retained nail withdrawal strength - Trex® Select® Decking % Report value 89.0
Fastener holding capacity after aging at –35°C - hidden fastening system - retained lateral nail strength - Trex® Transcend® Decking % Report value 152.5
Fastener holding capacity after aging at –35°C - hidden fastening system - retained lateral nail strength - Trex® Select® Decking % Report value 140.5
Fastener holding capacity after UV aging - hidden fastening system - retained nail withdrawal strength - Trex® Transcend® Decking % Report value 90.8
Fastener holding capacity after UV aging - hidden fastening system - retained nail withdrawal strength - Trex® Select® Decking % Report value 79.5Table footnote (2)
Fastener holding capacity after UV aging - hidden fastening system - retained lateral nail strength - Trex® Transcend® Decking % Report value 113.5
Fastener holding capacity after UV aging - hidden fastening system - retained lateral nail strength - Trex® Select® Decking % Report value 99.4

 

Administrative information

Use of Canadian Construction Materials Centre (CCMC) assessments

This assessment must be read in the context of the entire CCMC Registry of Product Assessments, any applicable building code or by-law requirements, and/or any other regulatory requirements (for example, the Canada Consumer Product Safety Act, the Canadian Environmental Protection Act, etc.).

It is the responsibility of the user to confirm that the assessment they are using is current and has not been withdrawn or superseded by a later version on the CCMC Registry of Product Assessments.

Disclaimer

The National Research Council of Canada (NRC) has evaluated only the characteristics of the specific product described herein. The information and opinions in this evaluation are directed to those who have the appropriate degree of experience to use and apply its contents (such as authorities having jurisdiction, design professionals and specifiers). This evaluation is valid when the product is used as part of permitted construction, respecting all conditions and limitations stated in the evaluation, and in accordance with applicable building codes and by-laws.

This evaluation is provided without representation, warranty or guarantee of any kind, expressed or implied, and the NRC provides no endorsement for any evaluated product. The NRC accepts no responsibility whatsoever arising in any way from any and all use of or reliance on the information contained herein or the use of any evaluated product. The NRC is not undertaking to render professional or other services on behalf of any person or entity nor to perform any duty owed by any person or entity to another person or entity.

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© His Majesty the King in Right of Canada, as represented by the National Research Council of Canada, 2024

All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior written permission of the CCMC.

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