[CCMC 14098-R] CCMC Canadian code compliance evaluation
From: National Research Council Canada
|Code compliance:||NBC 2015, OBC|
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Code 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-00||184.108.40.206.(1)(e) CSA G40.21, "Structural Quality Steel."||Acceptable|
|04-02-03-10-00-0-00||220.127.116.11.(1) Where conditions are corrosive to steel, ...||Acceptable|
|04-02-04-01-00-0-00||18.104.22.168.(1) The design of foundations, excavations a ...||Acceptable|
|09-04-01-01-01-c-01||22.214.171.124.(1)(c)(i) Part 9, or||Acceptable|
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 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.
- Twist Helical Screw Pile SP1
- Twist Helical Screw Pile SP2
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.
|Product||Outside diameter||Helix diameter × thickness|
|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.
This evaluation is valid only for products produced at the following plant:
|Product names||Manufacturing plant|
|Leduc, AB, CA|
|Twist Helical Screw Pile SP1||Product evaluated by the CCMC|
|Twist Helical Screw Pile SP2||Product 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.”
This evaluation is based on demonstrated conformance with the following criteria:
|Criteria number||Criteria name|
|CCMC-TG-316615.13-15A||CCMC 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.
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.
|Applied torque||Allowable loads - compression||Allowable loads - tension|
|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||-||-|
|Applied Torque||Allowable loads - compression||Allowable loads - tension|
|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||-||-|
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, 2023
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