[CCMC 13675-R] CCMC Canadian code compliance evaluation
From: National Research Council Canada
GoliathTech screw pile
|Compliance:||NBC 2015, OBC|
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It is the opinion of the Canadian Construction Materials Centre that the evaluated product, when used as an auger-installed steel pile in a foundation system 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|
|04-02-03-08-01-e-00||188.8.131.52.(1)(e) CSA G40.21, "Structural Quality Steel."||Acceptable|
|04-02-03-10-00-0-00||184.108.40.206.(1) Where conditions are corrosive to steel, ...||Acceptable|
|04-02-04-01-00-0-00||220.127.116.11.(1) The design of foundations, excavations a ...||Acceptable|
|09-04-01-01-01-c-01||18.104.22.168.(1)(c)(i) Part 9, or||Acceptable|
Ontario Building Code
Ruling No. 16-07-337 (13675-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 2016-11-25 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.
GoliathTech screw pile
The product is an earth anchor constructed of helical-shaped circular steel blades that are welded to a steel shaft. The blades are constructed as a helix with a carefully controlled pitch.
The anchor type and blade diameter are chosen based on the bearing capacity of the soil and the load the auger-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 plates and accessories conform to CSA G40.21 50W, “General Requirements for Rolled or Welded Structural Quality Steel / Structural Quality Steel,” 350 MPa.
- The steel tubes conform to ASTM A 500/A 500M-13, “Standard Specification for Cold-Formed Welded and Seamless Carbon Steel Structural Tubing in Rounds and Shapes,” Grade C, 320 MPa.
|Type||Exterior pile shaft diameter||Pile wall thickness||Available helical blade diameter||Helical blade thickness|
|48 mm / 1.875 in.||3.9 mm / 0.154 in.||From 228 mm / 8 in. to 431 mm / 17 in.||9.5 mm / 0.375 in.|
|60 mm / 2.375 in.||3.9 mm / 0.154 in.||From 228 mm / 9 in. to 431 mm / 17 in.||9.5 mm / 0.375 in.|
|482 mm / 19 in.||12.7 mm / 0.500 in.|
|73 mm / 2.875 in.||6.3 mm / 0.250 in.||From 228 mm / 9 in. to 431 mm / 17 in.||9.5 mm / 0.375 in.|
|From 482 mm / 19 in. to 787 mm / 31 in.||12.7 mm / 0.500 in.|
|89 mm / 3.5 in.||6.3 mm / 0.250 in.||From 228 mm / 9 in. to 431 mm / 17 in.||9.5 mm / 0.375 in.|
|From 482 mm / 19 in. to 787 mm / 31 in.||12.7 mm / 0.500 in.|
Figure 1 below shows a typical steel pile with a single helical blade.
This evaluation is valid only for products produced at the following plant:
|Product name||Manufacturing plant|
|Magog, QC, CA|
|GoliathTech screw pile||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 Report.
- When the product is installed in granular soil or silt, there is a direct relationship between the applied torque and the allowable compressive and tensile loads. The Allowable compressive and tensile loads for the proposed auger-installed pile in granular soil or silt table indicates the allowable compressive and tensile loads as a function of the applied torque.
- When the auger-installed steel pile is installed with granular material that exceeds 200 mm in diameter, the relationship between the applied torque and the allowable compressive and tensile loads is not as predictable. When it is installed in such soils, the allowable compressive and tensile loads have to be confirmed by on-site load tests. These load tests are also required if the allowable loads need to be greater than those stated in the Allowable compressive and tensile loads for the proposed auger-installed pile in granular soil or silt table and the Allowable compressive and tensile loads for the proposed auger-installed pile in cohesive soil table. The tests need to be conducted under the direct supervision of a professional geotechnical engineer, skilled in such design and licensed to practise under the appropriate provincial or territorial legislation.
- In all cases, a registered professional engineer skilled in such design and licensed to practise under the appropriate provincial or territorial legislation must determine the number and spacing of the auger-installed steel piles required to carry all the loads. A certificate attesting to the conformity of the installation and the allowable loads for the piles must be provided.
- The installation of the auger-installed steel pile must be carried out as per the manufacturer’s instructions. The anchors must be screwed into the ground to below the frost line using mechanized equipment. The anchor is rotated into the ground with sufficient applied downward pressure (crowd) to advance the anchor one pitch distance per revolution. The anchor 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). Helical anchors are rapidly installed in a wide variety of soil formations using a variety of readily available equipment. They 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 practise 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 (ASTM A123/A123M-17) with a minimum thickness of 610 g/m2, or another method that provides an equivalent level of protection and abrasion resistance deemed acceptable by the CCMC.
- The installer of the proposed auger-installed steel piles must be certified by GoliathTech Inc. Using approved equipment, the installer must follow the manufacturer’s installation instructions and the uses and limitations specified in this Report. Each installer must carry a certification card bearing their signature and photograph.
- Each auger-installed steel pile must be identified with a label containing the manufacturer’s identification and “CCMC 13675-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 proposed auger-installed steel piles were tested to:
- ASTM D 1143/D 1143M-07(2013), “Standard Test Methods for Deep Foundations Under Static Axial Compressive Load,”
- ASTM D 3689/D 3689M-07(2013) e1, “Standard Test Methods for Deep Foundations Under Static Axial Tensile Load,” and
Testing was conducted at various sites that included granular and cohesive soils. A series of 51 tests were performed. The intent of the testing was to determine a correlation between the torque applied during installation and the allowable loads.
- In the granular and silt-based soil there was a good correlation between the torque applied during installation and the allowable loads. For the compressive loads noted in the table below, the factor of safety varied from 2.0 to 3.0. For the tensile loads, the factor of safety varied from 2.0 to 2.7.
- In the cohesive soil there was a good correlation between the torque applied during installation and the allowable loads. A factor of safety of 2.0 was used.
- For lateral loads in each soil condition, no correlation was possible.
|Applied torque||Allowable load|
|678||500||20||4 500||12||2 700|
|1 017||750||23||5 175||15||3 375|
|1 356||1 000||27||6 075||18||4 050|
|1 695||1 250||30||6 750||20||4 500|
|2 034||1 500||33||7 425||23||5 175|
|2 373||1 750||37||8 325||26||5 850|
|2 712||2 000||40||9 000||29||6 252|
|3 051||2 250||44||9 900||32||7 200|
|3 390||2 500||47||10 575||34||7 650|
|3 728||2 750||51||11 475||37||8 325|
|4 067||3 000||54||12 150||40||9 000|
|4 406||3 250||57||12 825||42||9 450|
|4 745||3 500||61||13 725||45||10 125|
|5 084||3 750||64||14 400||48||10 800|
|5 423||4 000||68||15 300||51||11 475|
|5 762||4 250||71||15 975||54||12 150|
|6 101||4 500||74||16 650||57||12 825|
|6 440||4 750||78||17 550||59||13 275|
|6 779||5 000||81||18 225||62||13 950|
|5 457||5 500||88||19 800||67||15 075|
|8 135||6 000||95||21 375||72||16 200|
|Applied torque||Allowable load|
|1 017||750||7||1 574||3||674|
|1 356||1 000||10||2 248||5||1 124|
|1 695||1 250||13||2 922||8||1 798|
|2 034||1 500||16||3 579||11||2 473|
|2 373||1 750||20||4 496||14||3 147|
|2 712||2 000||23||5 171||16||3 597|
|3 051||2 250||26||5 845||19||4 271|
|3 390||2 500||29||6 519||22||4 946|
|3 728||2 750||33||7 419||24||5 395|
|4 067||3 000||36||8 093||27||6 070|
|4 406||3 250||39||8 767||30||6 744|
|4 745||3 500||42||9 442||33||7 419|
|5 084||3 750||45||10 116||35||7 868|
|5 423||4 000||49||11 015||38||8 543|
|5 762||4 250||52||11 690||41||9 217|
|6 101||4 500||55||12 364||44||9 891|
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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