[CCMC 13125-R] CCMC Canadian code compliance evaluation

From: National Research Council Canada

CCMC number:

13125-R

Status:

Active

Issue date:

2003-06-24

Modified date:

2022-02-02

Evaluation holder:

Trex Company, Inc.

245 Capitol Lane
Winchester VA 22602
United States
Website: www.trex.com
Telephone: 540-542-6300

Product name:

Trex^® Transcend^® Decking

Code compliance:

NBC 2015, OBC

Evaluation requirements:

CCMC-TG-067314.01-15 "CCMC Technical Guide for Wood Thermoplastic Composite Lumber Exterior Decking (Solid Cross-Section)"

In most jurisdictions this document is sufficient evidence for approval by Canadian authorities.

Learn more about CCMC recognition

Code compliance opinion

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

National Building Code of Canada 2015

ID	Code provision	Solution type
09-03-02-09-00-0-00	9.3.2.9. Termite and Decay Protection	Alternative
09-04-02-03-00-0-00	9.4.2.3. Platforms Subject to Snow and Occupancy Loads	Alternative
09-04-03-01-00-0-00	9.4.3.1. Deflections	Alternative
09-08-09-01-00-0-00	9.8.9.1. Loads on Stairs and Ramps	Alternative
09-23-15-05-00-0-00	9.23.15.5. Subfloor Thickness or Rating	Alternative

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 is 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 name

Trex^® Transcend^® Decking

Product description

The product is 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 solid cross sections. The product is available in 23.7 mm × 137 mm cross sections. The product is intended to be used as stair treads or as exterior decking installed over traditional structural wood framing.

Figure 1. Trex^® Transcend^® Decking

3 mm to 5 mm minimum spacing between ends of the planks, depending on the length of the plank and temperature at installation
Trex^® Transcend^® Decking
6 mm or 10 mm spacing between sides of the planks, depending on the temperature at installation
Minimum of 3 joists per plank
Maximum joist spacing of 400 mm o.c. for 23.7 mm × 137 mm planks
Joist designed to support applicable loads
Two 76-mm-long fasteners per plank at each intersecting joist

Manufacturing plants

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

Product name	Fernley, Nevada, United States	Winchester, Virginia, United States
Trex^® Transcend^® Decking	⦿	⦿

⦿ 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 product must be installed with supports spaced no greater than 400 mm on center (o.c.). Each plank must be supported by at least three joists.
When used as stair treads, the product must be installed with supports spaced no greater than 305 mm.
The products must be fastened to the wood joists with fasteners conforming to Article 9.23.3.1., Standards for Nails and Screws, of Division B of the NBC 2015 that have a corrosion protection coating^Footnote⁽¹⁾ or are made of stainless steel. The planks must be fastened with at least two fasteners per joist and the fasteners must be at least 76 mm long.
The product must be installed according to the manufacturer’s installation instructions.
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 5 mm for installations below 15°C and 3 mm for installations above 15°C. The width-to-width gapping must be 6 mm for installations above 5°C and 10 mm for installations below 5°C.
The products should be installed by a knowledgeable person familiar with the product installation guide.
The product’s label or packaging must be identified with the manufacturer’s name or logo and the phrase “CCMC 13125-R.”

Technical information

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

Evaluation requirements
Criteria number	Criteria name
CCMC-TG-067314.01-15	CCMC Technical Guide for Wood Thermoplastic Composite Lumber Exterior Decking (Solid Cross-Section)

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

Material requirements

Table 1. Results of testing the physical properties of the product
Property				Unit	Requirement	Result^{Table footnote (1)}^{Table footnote (2)}
Dimensional change	coefficient of linear expansion (thermal)	longitudinal		cm/cm/°C	< 2 × 10^-5	5.2 × 10^-5^{Table footnote (3)}
	coefficient of linear expansion (thermal)	cross sectional		cm/cm/°C	< 2 × 10^-5	7.1 × 10^-5^{Table footnote (3)}
	coefficient of linear expansion (swelling): oven dry to vacuum pressure soak			%	< 0.5 by 80% of specimens	0.0
Strength and stiffness	modulus of elasticity (MOE)	span to depth ratio within 18 to 21		MPa	> 750	2 980
Strength and stiffness	modulus of rupture (MOR)	span to depth ratio within 18 to 21		MPa	> 9	30
Impact resistance (Izod impact, notched)				J/m	> 53.4	41^{Table footnote (4)}
Hardness (11.28-mm-diameter ball)				kN	> 1.8	3.8
Creep, recovery and load duration				%	< 25 for creep	49.1^{Table footnote (5)}
					> 75 for recovery	68.7^{Table footnote (5)}
					No failure	Pass
Strength and stiffness after aging		weathering: impact resistance		%	> 75 of non-weathered value	92
		accelerated aging	MOE	%	> 50 of non-aged value	60
		accelerated aging	MOR	%	> 50 of non-aged value	71
Fastener holding capacity		nail withdrawal strength		N	> 600	761 (standard deviation = 35)
Fastener holding capacity		lateral nail strength		N	> 720	518^{Table footnote (6)} (standard deviation = 100)
Flame-spread rating		smoke development		-	< 200	120
Flame-spread rating		smoke development		-	Report	> 500

Notes:

Footnote 1

Average test results of six specimens, except for the “Creep, recovery and load duration” results, which are from three specimens.

Return to table footnote 1 referrer

Footnote 2

Test results were obtained to classify the products and are not intended to be used as engineering design properties.

Return to table footnote 2 referrer

Footnote 3

Performance result allowed based on the manufacturer’s gapping installation instructions.

Return to table footnote 3 referrer

Footnote 4

Performance result allowed based on the full-scale structural impact test results.

Return to table footnote 4 referrer

Footnote 5

Performance result allowed for decking application based on test results obtained in full-scale structural testing. The product’s creep (deformation under constant load) results will be greater than that of lumber planks.

Return to table footnote 5 referrer

Footnote 6

Performance result allowed based on the full-scale structural test results and fastening detail test results.

Return to table footnote 6 referrer

Table 2. Results of testing the durability, decay, termite and slip resistance properties of the product
Property			Requirement	Result
Durability		MOE	Mean percentage losses in MOE and MOR after UV exposure and accelerated aging must be less than or equal to spruce lumber.	Pass
Durability		MOR		Pass
Decay resistance		% loss in weight	Mean percentage losses in weight and compressive strength after exposure to decay-causing fungi must be equal to or better than spruce heartwood.	Pass
Decay resistance		compressive strength		Pass
Termite resistance			Rating must be equal to or better than preservative-treated wood conforming to CSA 80.1-M97	Pass
Slip resistance	dry condition	longitudinal planks	> 0.5 ASTM D2394 (05)	Parallel to planks	Perpendicular to planks
	dry condition			0.43^{Table footnote (1)}	0.52
	wet condition			0.32^{Table footnote (1)}	0.39^{Table footnote (1)}

Performance requirements

Table 3. Results of testing the performance of the product under concentrated static loads and impact loads
Property		Requirement		Result^{Table footnote (1)}
Property		Minimum ultimate load (kN)	Maximum deflection under 0.89 kN load (mm)	Ultimate load (kN)	Deflection under 0.89 kN load (mm)
Concentrated static load	decking at 50°C	2.45	2.4	3.88	2.71
	decking at 20°C			4.20	2.7^{Table footnote (2)}
	decking at –35°C			4.14	1.06
Impact load of 102 N·m	decking at 50°C	1.78	2.4	>1.78	2.3
Impact load of 102 N·m	decking at –35°C	1.78	2.4	>1.78	1.12

Table 4. Results of testing the performance of stair treads under a concentrated static load
Property		Requirement		Result^{Table footnote (1)}
Property		Minimum ultimate load (kN)	Maximum deflection under 1 kN (mm)	Applied ultimate load (kN)	Deflection under 1 kN (mm)
Concentrated static load	stair tread	5^{Table footnote (2)}	0.75	8.75	1.4^{Table footnote (3)}

Administrative information

Disclaimer

This evaluation is issued by the Canadian Construction Materials Centre (CCMC), a part of the Construction Research Centre at the National Research Council of Canada (NRC). The evaluation must be read in the context of the entire CCMC Registry of Product Assessments and the legislated applicable building code in effect.

The CCMC was established in 1988 on behalf of the applicable regulator (i.e., the provinces and territories) to ensure—through assessment—conformity of alternative and acceptable solutions to regional building codes as determined by the local authority having jurisdiction (AHJ) as part of the issuance of a building permit.

It is the responsibility of the local AHJs, design professionals, and specifiers to confirm that the evaluation is current and has not been withdrawn or superseded by a later issue. Please refer to the website or contact:

Canadian Construction Materials Centre
Construction Research Centre
National Research Council of Canada
1200 Montreal Road
Ottawa, Ontario, K1A 0R6
Telephone: 613-993-6189
Fax: 613-952-0268

The NRC has evaluated the material, product, system or service described herein only for those characteristics stated 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 (i.e., AHJs, design professionals and specifiers). This evaluation is only valid when the product is installed in strict compliance with the stated conditions and limitations of evaluation and the applicable local building code. In circumstances where no applicable local building permit is issued and that no confirmation of compliance ‘for use in the intended field application’ is undertaken, this evaluation is null and void in all respects. This evaluation is provided without representation, warranty, or guarantee of any kind, expressed, or implied, and the NRC provides no endorsement for any evaluated material, product, system or service described herein. The NRC accepts no responsibility whatsoever arising in any way from any and all use and reliance on the information contained in this evaluation with respect to its compliance to the referenced code(s) and standard(s). 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.

Language

Une version française de ce document est disponible.
In the case of any discrepancy between the English and French version of this document, the English version shall prevail.

Copyright

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.

Code Compliance via Alternative Solutions

Where a design differs from the acceptable solutions in Division B, then it should be treated as an "alternative solution." A proponent of an alternative solution must demonstrate that the alternative solution addresses the same issues as the applicable acceptable solutions in Division B and their attributed objectives and functional statements. However, because the objectives and functional statements are entirely qualitative, demonstrating compliance with them in isolation is not possible. Therefore, Clause 1.2.1.1.(1)(b) identifies the principle that Division B establishes the quantitative performance targets that alternative solutions must meet. In many cases, these targets are not defined very precisely by the acceptable solutions [...] Nevertheless, Clause 1.2.1.1.(1)(b) makes it clear that an effort must be made to demonstrate that an alternative solution will perform as well as a design that would satisfy the applicable acceptable solutions in Division B—not “well enough” but “as well as.”

National Building Code of Canada, Sentence A-1.2.1.1.(1)(b)

The CCMC has determined that compliance with this provision of the Code has been demonstrated as an Alternative Solution. The evaluation report provides a summary of the basis of CCMC's compliance opinion.

CCMC's code compliance opinions

All CCMC evaluation reports are opinions of code compliance established in accordance with the National Building Code of Canada, Subsection 1.2.1. "Compliance with this Code," which requires compliance to be achieved by:

complying with the applicable acceptable solutions in Division B, or
using an alternative solution that will achieve at least the minimum level of performance required by Division B in the areas defined by the objective and functional statements attributed to the applicable acceptable solutions.

The CCMC assesses compliance with Canadian building, energy and safety codes, and is trusted by over 6,000 regulators across Canada.

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[CCMC 13125-R] CCMC Canadian code compliance evaluation