Recommendation:Execution of special geotechnical works- Steel Screw Piles.

Screw piles have only recently begun to be used as foundation solutions in Denmark. However, interest in screw piles as alternatives to traditional foundation methods has grown significantly, particularly following the introduction of CO₂ reduction requirements in the construction sector—especially for single-family homes.<br/><br/>Recent studies have demonstrated that replacing conventional concrete strip foundations and concrete floor slabs with screw piles can reduce CO₂ emissions by up to 85% for a single-family house.<br/><br/>Historically, screw piles have struggled to gain traction in Danish construction practices, primarily due to the lack of well-documented performance data. The installation process of screw piles is critical, as it fundamentally defines their load-bearing capacity. To date, no standards or guidelines exist that clearly describe how these piles should be installed and documented to ensure the same level of structural reliability as traditional foundation solutions.<br/><br/>This document has been developed specifically to address that gap, by providing clear guidance on the design, installation, and documentation of screw piles for use in Danish construction. Part 1 of this document (Chapters 1–3) presents the evidence and rationale underlying the documentation requirements set forth in Part2 (Chapter 4- 10). Part 2 is written in the format of a standard.<br/><br/>One of the key challenges associated with screw piles is the lack of design standards. Each manufacturer produces piles with different geometries and configurations, which influences the interaction between the pile and soil, particularly with respect to installation resistance and failure mechanisms.<br/><br/>This guideline is based on research results obtained through the Grand Solution project: Day to Day Foundation – Innovative and Cost-Effective Solutions for Future Housing Construction Using Ground Screw Foundations. The project has received financial support from Innovation Fund Denmark under grant agreement no. 9090-0051A.This recommendation is based on research outcomes obtained through the Innovation Project Day-to-Day, as well as on practical experience gained through full-scale testing of various screw pile types in different soil conditions. https://innovationsfonden.dk/da/i/historier/skruefundamenter-skal-goere-byggeri-mere.<br/><br/>This recommendation focuses specifically on steel screw piles, as these are the most commonly used type in traditional house construction and in multi-store buildings up to four floors.<br/><br/>In addition to steel screw piles, concrete screw piles are also available on the market and are primarily used in larger building projects. Their design principles and installation methods differ significantly from those of steel screw piles and are not covered in this document.<br/><br/>The aim is to provide engineers, contractors, and authorities with a technically consistent framework that ensures structural reliability and compliance with sustainability objectives.<br/>