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[CCMC 14038-R] CCMC Canadian code compliance evaluation

From: National Research Council Canada

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Compliance opinion

It is the opinion of the Canadian Construction Materials Centre that the evaluated product, when used as a non-structural exterior wall sheathing in accordance with the conditions and limitations stated in this evaluation, complies with the following codes:

National Building Code of Canada 2010

ID Code provision Solution type
09-23-17-02-00-0-009.23.17.2.(1) Where wall sheathing is required for the ...Alternative
Table 9.23.17.2.-A Wall Sheathing Thickness and Specifications (gypsum sheathing)Alternative

National Building Code of Canada 2015

ID Code provision Solution type
09-23-17-02-00-0-00Table 9.23.17.2.A Wall Sheathing Thickness and SpecificationsAlternative
09-23-17-02-00-0-009.23.17.2.(1) Where wall sheathing is required for the ...Alternative

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

MEGCRETe™ MgO Board using MBP-IP Technology

Product description

This evaluation report addresses the performance of Rethinking Construction's proprietary MEGCRETe™ MgO Board using MBP-IP Technology as a suitable non-structural exterior sheathing as an alternative solution to exterior gypsum sheathing. As both these exterior sheathings are non-structural and not qualified to provide bracing of exterior walls, the interior gypsum is designated as the bracing to resist lateral loads with the associated provisions in Subclause 9.23.13.1.(2)(a)(iii) of the NBC 2015.

The product is an innovative magnesium oxychloride (MgOCl)-based panel with a proprietary formulation. The panels are available in a standard 1.2 m × 2.4 m (4 ft. × 8 ft.) size and with thicknesses ranging from 10 mm to 25 mm. The 12-mm-thick sheathing was tested.

Due to the free chloride ions within the panel matrix, which may cause premature corrosion of fasteners, the panel must be attached with stainless steel fasteners to the lumber stud framingFootnote (1) using Type SS304, SS305 or SS316. The fasteners may be staples or screws (e.g., self-tapping or non-self-tapping if panel is pre-drilled). For staples they must be 16 gauge SS316 staples that are 11 mm wide × 38 mm in length. In addition, any subsequent fasteners that may penetrate the exterior sheathing (e.g., cladding fasteners) must also be SS304, SS305 or SS316 grade stainless steel.

The evaluation holder produces prefabricated wall panels of conventional wood-frame construction containing the MEGCRETe™ MgO Board using MBP-IP Technology panels and ensures that proper corrosion resistant fasteners are used. In other installations of their MgO panels, the evaluation holder provides field supervision of their panel installation. Subsequently, installed fasteners through the MgO panel into studs, installed by others, must also meet the fastener specification herein.

 

Figure 1 shows a typical non-structural exterior sheathing application.

a render of a typical non-structural exterior sheathing application
Figure 1. MEGCRETe™ MgO Board using MBP-IP Technology exterior sheathing on a conventional wood-frame wall
  1. lumber studs
  2. MEGCRETe™ MgO Board using MBP-IP Technology (attached with corrosion resistant fasteners
  3. insulation
  4. vapour/air barrier as per NBC 2015 or alternative solutions
  5. interior gypsum board (attached as designated bracing)

Note: Not shown are the required sheathing membrane and cladding as per NBC 2015, attached with corrosion fasteners specified herein.

 

Figure 2 shows a possible non-structural interior sheathing application.Footnote (2)

  
a render of a possible non-structural interior sheathing application

Figure 2. MEGCRETe™ MgO Board using MBP-IP Technology interior sheathing on a conventional wood-frame wall

  1. OSB sheathing (attached as designated bracing)
  2. Single 2×6 SPF lumber @ 24 inches on centre
  3. Expanded polystyrene insulation
  4. Vapour/air barrier as per NBC or alternative solutions
  5. MEGCRETe™ MgO Board using MBP-IP Technology (attached with corrosion resistance fasteners)

Note: Not shown is the required air/vapour barrier as per NBC 2015 or alternative solutions.

Manufacturing plant

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

Product nameManufacturing plant
Nantong City, Shijiao Town, China
MEGCRETe™ MgO Board using MBP-IP TechnologyProduct 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 bracing for the exterior wall assembly must be the interior gypsum board as this product has not been evaluated for structural use in providing the designated bracing. Therefore, the installations are limited to locations where the interior gypsum is the designated bracing, as per Subclause 9.23.13.1.(2)(a)(iii) in the NBC 2015, which is limited to geographical areas where the seismic spectral response acceleration Sa(0.2) is < 0.70 and the 1-in-50 hourly wind pressure is < 0.80 kPa.
  • The interior gypsum must be installed with fastener spacing as per Sentences 9.29.5.8.(3) or 9.29.5.8.(4) in the NBC 2015.
  • The fasteners for attachment of the product as an exterior sheathing must be Type SS304, SS305 or SS316 (e.g., self-tapping screws) and was shown to accept 16 gauge Type SS304, SS305 or SS316 staples, 11 mm wide × 38 mm in length.
  • Any fasteners that may penetrate the exterior sheathing product for attachment to the studs (e.g., cladding fasteners) must be Type SS304, SS305 or SS316 stainless steel grade (e.g., self-tapping screws).
  • This current evaluation for exterior sheathing is limited to installation on wood frame at this time.
  • The sheathing membrane protection and cladding must be as per NBC 2015 provisions.
  • As with exterior gypsum board during construction, the product must be protected from excessive rain/moisture exposure during construction.
  • The product must be clearly identified with the phrase “CCMC 14038-R.”

  Technical information

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

Evaluation requirements
Criteria number Criteria name
CCMC-TG-061673.00-10CCMC Technical Guide for Magnesium Oxide Chloride Board Exterior Wall Sheathing
CCMC-TG-061673.00-15CCMC Technical Guide for Magnesium Oxide Chloride Board Exterior Wall Sheathing

The CCMC Technical Guide for MEGCRETe™ MgO Board using MBP-IP Technology sets out the technical evidence required by CCMC to evaluate the product as an alternative solution in compliance with the NBC 2010/2015. The Report Holder has submitted test results and other data for the CCMC evaluation. Testing was conducted at an independent laboratory recognized by CCMC. The corresponding test results for the product are summarized below.

Preformance requirements

Table 1. Results of testing the performance requirements of the product
Property Unit Requirement Result
Material variability flexural strength F-statistic 10 boards from each of 4 production batches Pass
density F-statistic 10 boards from each of 4 production batches Pass
chemistry N/A X-ray diffraction Pass
atomic % X-ray fluorescence Pass
Leachate pH pH pH > Gypsum board or 6, whichever is greater 8-9 pH
Free chloride ion leachate (weight of board mass) % If > 0.1%, corrosion resistant fasteners required 7
Vicker’s hardness MPa ASTM E384 report value Varies 40-150
Fastening – staples (16 gauge SS316 staples, 11 mm wide × 38 mm in length) Install panels on a 12 ft. × 8 ft. wood frame and observe if breakage after 95% are installed Pass
Flexural strength of immersed samples MPa Average residual strength after immersion from each lot ≥ 90% of average strength of as-received material. The residual strength after immersion of each specimen must be ≥ 80% of average strength of as-received material. ASTM C293 Pass
Flexural strength of samples exposed to construction moisture (e.g., rain) MPa Average loss in strength of all MgOCl samples ≤ Average loss in strength of NBC benchmark (e.g., exterior gypsum) PassTable footnote (1)
 Water vapour permeance ng/Pa·s·m2 ASTM E96, desiccant method > 170 ng/Pa·s·m2 300
Air permeance L/s·m2·Pa @ 75 Pa ΔP Report value (ULC S741-08) 0.0422
Fastener corrosion (mass loss compared to SS316) % Mass loss of SS316 did not exceed 0.07%. Mass loss of SS304 did not exceed 0.11%. ASTM G198-11 Pass with only 0.04% difference following 4-month test programTable footnote (2)

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.

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

© 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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