Thermosyphon foundations for buildings in permafrost regions

1.1 Scope

This Standard provides requirements for all life-cycle phases of thermosyphon foundations for new buildings on permafrost, including site characterization, design, installation, and commissioning phases as well as for monitoring and maintenance phases. This Standard is meant to ensure the long-term performance of thermosyphon-supported foundation systems under changing environmental conditions.

1.2 Objectives

The objectives of this Standard are to

a) describe performance expectations for thermosyphon foundations together with monitoring requirements necessary to support an appropriate maintenance program;
b) specify the materials to be used in thermosyphon foundations;
c) foster an awareness and understanding of application technology, with a focus on factors that could compromise the functionality of foundation systems reliant on thermosyphons;
d) describe the typical phases of the life cycle of thermosyphon foundations for buildings on permafrost, including design, installation, commissioning, monitoring, and maintenance;
e) provide guidance to maximize the long-term viability of thermosyphon-supported foundation systems under changing environmental conditions; and
f) describe performance expectations for thermosyphon foundations together with monitoring requirements necessary to support a maintenance program.

1.3 Application

This Standard is intended to be used by designers, contractors, building owners, and operators. For owners, it provides an understanding of the design and construction processes required to permit verification that adequate measures are taken during these phases. The Standard also sets out monitoring and maintenance expectations for building operators. This Standard is applicable to new buildings on permafrost sites. It is not intended to provide guidance for initial selection of the most appropriate foundation type for any particular structure on a permafrost site. It is assumed that a thorough review of alternative foundation systems has been undertaken and that that the site has been categorized as potentially thaw-unstable. Preservation of the permafrost for support of the structure has been identified as a design objective before this Standard is implemented