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[CCMC 14098-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 products, when used as a steel pile in a foundation system in accordance with the conditions and limitations stated in this evaluation, comply with the following code:

National Building Code of Canada 2015

ID Code provision Solution type
04-02-03-08-01-e-004.2.3.8.(1)(e) CSA G40.21, "Structural Quality Steel."Acceptable
04-02-03-10-00-0-004.2.3.10.(1) Where conditions are corrosive to steel, ...Acceptable
04-02-04-01-00-0-004.2.4.1.(1) The design of foundations, excavations a ...Acceptable
09-04-01-01-01-c-019.4.1.1.(1)(c)(i) Part 9, orAcceptable

Ontario Building Code

Ruling No. 19-02-358 (14098-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 2019-01-18 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

  • Twist Helical Screw Pile SP1
  • Twist Helical Screw Pile SP2

Product description

The product is a helical screw pile constructed of helical-shaped circular steel plates that are welded to a steel shaft. The plates are constructed as a helix with a carefully controlled pitch, similar to the thread on a screw.

The helical piles tested are summarized in the table below.

Table 1. Specifications of the product
Product Outside diameter Helix diameter × thickness
Pile type in. mm in. mm
SP1 2.875 73 12 × 0.375 305 × 9.5
SP2 3.5 89 14 × 0.5 356 × 12.7

The pile type and helix diameter are chosen based on the bearing capacity of the soil and the load that the rotary-installed steel pile is designed to support. The central shaft is used to transmit torque during installation and to transfer axial loads to the helical plates. The foundation system comes with various other accessories, such as support plates to adapt to the building structure, extension shafts and connectors.

The steel shaft, plates and accessories conform to CSA G40.20-13/G40.21-13, “General Requirements for Rolled or Welded Structural Quality Steel/Structural Quality Steel.”

The figure below shows typical steel piles.

Illustration of Twist Helical Screw Piles, SP1 and SP2

Figure 1. Twist Helical Screw Piles, SP1 and SP2

Manufacturing plant

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

Product namesManufacturing plant
Leduc, AB, CA
Twist Helical Screw Pile SP1Product evaluated by the CCMC
Twist Helical Screw Pile SP2Product 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 under this evaluation is intended to be used as a foundation system to support the following types of construction:
    • Single storey residential buildings within the scope of Part 9 of NBC 2015;
    • Accessory buildings such as sheds, gazebos, sunrooms, carports, and decks/porches within the scope of Part 9 of NBC 2015.

    Other applications are beyond the scope of this evaluation, wherein a professional engineer skilled in such design and licensed to practice under the appropriate provincial or territorial legislation must determine the pile capacity and other design parameters.

  • The product may be used as part of a foundation system to support various constructions, provided that it is installed according to the manufacturer’s current instructions and within the scope of this evaluation.
  • The structural application of these products shall be in strict accordance with the allowable load vs. applied torque tables prepared by the University of Alberta, which are reproduced in:
  • When the product is installed in cohesive and cohesion-less soils, there is a direct relationship between the applied torque and the allowable compressive and tensile loads. The tables under Technical information indicate the allowable compressive and tensile loads as a function of the applied torque.
  • Load tests are required if the allowable loads need to be greater than those stated in the tables under Technical information. The tests must be conducted under the direct supervision of a professional geotechnical engineer, skilled in such design and licensed to practice under the appropriate provincial or territorial legislation.
  • In all cases, a registered professional engineer skilled in such design and licensed to practice under the appropriate provincial or territorial legislation must determine the number and spacing of the rotary-installed steel piles required to carry the load. A certificate attesting to the conformity of the installation and the allowable loads for the piles must be provided.
  • The installation of the rotary-installed steel pile must be carried out as per the manufacturer’s instructions. The helical piles must be screwed into the ground to below the frost line using mechanized equipment. The helical pile is rotated into the ground with sufficient applied downward pressure to advance the helical pile one pitch-distance per revolution. The helical pile is advanced until the applied torque value attains a specified value. Extensions are added to the central shaft as needed. The applied loads may be tensile (uplift), or compressive (bearing). The piles are immediately ready for loading after installation.
  • Where conditions (soil and environmental) are determined to be corrosive to steel, protection of the steel shall be provided. The determination of the presence of corrosive conditions and the specification of the corrosion protection shall be carried out by a registered professional engineer licensed to practice under the appropriate provincial or territorial legislation. If the determination of the presence of corrosive conditions is not completed before installation, the product, including all its accessories, is required to be hot-dipped galvanized, meeting the requirements of CAN/CSA-G164 or ASTM A123/A123M with a minimum thickness of 610 g/m2, or subjected to another method that provides an equivalent level of protection and abrasion resistance deemed acceptable by the CCMC.
  • The installer of the proposed rotary-installed steel piles must be certified by Twist Developments Inc. using approved equipment. The installer must follow the manufacturer’s installation instructions and the uses and limitations specified in this evaluation. Each installer must carry a certification card bearing their signature and photograph.
  • The evaluation holder has proprietary interest in this evaluation and any use must be authorized by Twist Developments Inc.
  • Each rotary-installed steel pile must be identified with a label that contains the manufacturer’s identification and the phrase “CCMC 14098-R.”

  Technical information

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

Evaluation requirements
Criteria number Criteria name
CCMC-TG-316615.13-15ACCMC Technical Guide for Augered-Installed Steel Piles

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.

Performance Requirements

The rotary-installed steel piles were tested to:

  • ASTM D 1143/D 1143M-07, “Standard Test Methods for Deep Foundations Under Static Axial Compressive Load” and
  • ASTM D 3689, “Standard Test Methods for Deep Foundations Under Static Axial Tensile Load.”

Testing was conducted at two different sites selected because they represent typical soil profiles encountered in Canada. A series of tests was performed covering a range of typical sand, and weak-clay to stiff-clay conditions. The intent of the testing was to determine a correlation between the torque applied during installation and the allowable loads. Testing showed a correlation between the torque applied during installation and the allowable loads. For the loads identified in the tables below, the factor of safety applied was 2.0 for compression and 2.5 for tension.

Table 2. Allowable compressive and tensile loads for the SP1 rotary-installed pile in cohesive and cohesion-less soils
Applied torque Allowable loads - compression Allowable loads - tension
Nm lbf kN lb kN lb
678 500 8.3 1 866 6.1 1 360
1 356 1 000 16.6 3 731 12.1 2 720
2 034 1 500 24.9 5 597 18.2 4 081
2 712 2 000 33.2 7 463 24.2 5 441
3 390 2 500 41.5 9 328 30.3 6 801
4 068 3 000 49.8 11 194 36.3 8 161
4 746 3 500 58.1 13 059 42.4 9 521
5 424 4 000 66.4 14 925 48.4 10 882
6 102 4 500 74.7 16 791 54.5 12 242
6 780 5 000 83 18 656 60.5 13 602
7 458 5 500 91.3 20 522 - -
8 136 6 000 99.6 22 388 - -

Table 3. Allowable compressive and tensile loads for the SP2 rotary-installed pile in cohesive and cohesion-less soils
Applied Torque Allowable loads - compression Allowable loads - tension
Nm lbf kN lb kN lb
678 500 7.9 1 779 6.9 1 558
1 356 1 000 15.8 3 557 13.9 3 117
2 034 1 500 23.7 5 336 20.8 4 675
2 712 2 000 31.6 7 115 27.7 6 233
3 390 2 500 39.6 8 894 34.7 7 792
4 068 3 000 47.5 10 672 41.6 9 350
4 746 3 500 55.4 12 451 48.5 10 908
5 424 4 000 63.3 14 230 55.5 12 467
6 102 4 500 71.2 16 009 - -
6 780 5 000 79.1 17 787 - -
7 458 5 500 87 19 566 - -
8 136 6 000 94.9 21 345 - -

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, 2023

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.

CCMC recognition

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Most Canadian authorities having jurisdiction (AHJs) consider CCMC product assessments acceptable as evidence for product approval.

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The CCMC provides code compliance assessments to Canadian code requirements, consulting nationwide with construction regulators to elicit regional variations in code requirements as well as provincial and local interpretations. Users are advised to review the technical information presented in CCMC assessments when making approval decisions. Learn more about how the CCMC provides a unique service for Canada.

For more information, contact the CCMC by phone at (613) 993-6189 or by email at ccmc@nrc-cnrc.gc.ca

NOTICE

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  • this PDF is intended for record-keeping purposes only,
  • it represents the information as it was available at the time of downloading, and
  • it may not reflect the latest available information at some future date.
References to this CCMC assessment (in product literature, on websites, etc.) must be made by linking to the evaluation webpage. This PDF must not be used as a means of distributing this assessment to an audience.

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Code compliance as an acceptable solution

Code Compliance via Acceptable Solutions

If a building design (e.g. material, component, assembly or system) can be shown to meet all provisions of the applicable acceptable solutions in Division B (e.g. it complies with the applicable provisions of a referenced standard), it is deemed to have satisfied the objectives and functional statements linked to those provisions and thus to have complied with that part of the Code.

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

The CCMC has determined that compliance with this provision of the Code has been demonstrated as an Acceptable 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.

Code compliance as an alternative solution

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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