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[CCMC 14089-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 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- Termite and Decay ProtectionAlternative
09-04-02-00-00-0-009.4.2. Specified LoadsAlternative
09-04-03-01-00-0- DeflectionsAlternative
09-08-09-01-00-0- Loads on Stairs and RampsAlternative
09-23-15-05-00-0- Subfloor Thickness or RatingAlternative

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 name

Asahikoushin WPC Decking

Product description

The product is a polymer-encapsulated wood thermoplastic composite lumber (WTCL) with a core material composition of 60% wood fibre, 35% plastic and 5% additives. The polymer capping material encases the inner core of the WTCL on all four sides and consists of 90% plastic and 10% additives. The product is manufactured in planks with a hollow cross-section. The planks are manufactured in nominal dimensions of 22.5 mm × 138 mm and are available in lengths of 2.44 m, 3.66 m and 4.88 m. The product is intended to be used as exterior decking installed over traditional structural wood framing.

Isometric profile drawing of the deck boards; the deck boards, spacing between sides of planks, minimum joists per plank, maximum joist spacing, fasteners and minimum spacing between ends of the planks.
Figure 1. Asahikoushin WPC Decking
  1. Asahikoushin WPC Decking
  2. 3-mm spacing between sides of the planks
  3. Minimum of three joists per plank
  4. Maximum joist spacing of 300 mm o.c. for 22.5-mm × 138-mm planks
  5. Joist designed to support applicable loads
  6. Two 38-mm-long fasteners per plank at each intersecting joist
  7. 5 mm to 3 mm minimum spacing between ends of the planks, depending on the length of the plank and temperature at installation

Manufacturing plant

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

Product nameManufacturing plant
Taicang Suzhou City, China
Asahikoushin WPC DeckingProduct 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 product must be installed with supports spaced no greater than 300 mm on centre (o.c.). Each plank must be supported by at least three joists.
  • The product must be installed at a minimum 150-mm height above the finished grade.
  • When used as stair treads, the product must be installed with supports spaced no greater than 203 mm.
  • Slip-resistance strips shall be provided in accordance with Article, Finish for Treads and Landings, of Division B of the NBC 2015.
  • The products must be fastened to the wood joists with fasteners conforming to Article, Standards for Nails and Screws, of Division B of the NBC 2015, that have a corrosion protection coatingFootnote (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 38 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 3 mm for all installation temperatures.
  • 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 14089-R.”

  Technical information

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

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

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 ResultTable footnote (1)Table footnote (2)
Dimensional change coefficient of linear expansion (thermal): longitudinal cm/cm/°C < 2 × 10-5 3.7 × 10-5Table footnote (3)
coefficient of linear expansion (swelling): oven-dry to vacuum-pressure soak % < 0.5 by 80% of specimens –0.1
Strength and stiffness modulus of elasticity (MOE): span-to-depth ratio within 18 to 21 MPa > 750 2 713
modulus of rupture (MOR): span-to-depth ratio within 18 to 21 MPa > 9 32
Impact resistance (Izod impact, notched) J/m > 53.4 27Table footnote (4)
Hardness (11.28-mm-diam ball) kN > 1.8 3.7
Creep, recovery and load duration % < 25 for creep 37Table footnote (5)
Creep, recovery and load duration % > 75 for recovery 72Table footnote (6)
Creep, recovery and load duration % No failure Pass
Strength and stiffness after aging weathering: impact resistance % > 75 of non- weathered value 93
accelerated aging - MOE % > 50 of non-aged value 92
accelerated aging - MOR % > 50 of non-aged value 89
Fastener holding capacity metal clip fastener withdrawal strength N > 600 1 096
plastic T-clip fastener withdrawal strength N > 600 1 456
lateral metal clip (direction 1) N > 720 677Table footnote (6)
lateral metal clip (direction 2) N > 720 1 660
lateral plastic T clip N > 720 2 178
Flame-spread rating - ≤ 200 65
Smoke development - Report 375
Table 2. Results of testing the durability, decay and termite 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
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 heartwoodFootnote (1) . Pass
Decay resistance - compressive strength
Termite resistance Rating must be equal to or better than preservative-treated wood conforming to CSA 80.1-M97. Pass
Table 3. Results of testing the slip resistance properties of the product
Property Requirement Result parallel to planks Result perpendicular to planks
Slip resistance: dry condition longitudinal planks > 0.5 0.2Table footnote (1) 0.2Table footnote (1)
Slip resistance: wet condition longitudinal planks > 0.5 0.4Table footnote (1) 0.5
Performance requirements
Table 4. Results of testing the performance of the product under concentrated static loads and impact loads
Property Requirement ResultTable footnote (1)
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 3.71 3.7Table footnote (2)
decking at 20°C 2.45 2.4 4.58 3.3Table footnote (2)
decking at ⁠–⁠35°C 2.45 2.4 6.65 1.9
Impact load of 102 N·m decking at 50°C 1.78 2.0 3.71 2.13Table footnote (2)
Table 5. Results of testing the performance of stair treads under a concentrated static load
Property Requirement ResultTable footnote (1)
Minimum ultimate load (kN) Maximum deflection under 1 kN (mm) Applied ultimate load (kN) Deflection under 1 kN (mm)
Concentrated static load stair tread 5Table footnote (2) 0.75 14.3 1.52Table footnote (3)

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.


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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