As discussed in last month’s article “Proper Grouting Protects Your Loop, Safeguards Groundwater,” grouting a geothermal borehole serves three vital purposes: to seal the hole/protect the ground loop, to protect groundwater from possible contamination and to improve thermal conductivity.
Since each project is unique and, as there are so many products that can be used, it is important that the heating and cooling requirements of the project and ground conditions including soil conductivity and groundwater chemistry are all taken into consideration by the engineer when selecting grouting material.