When the Union’s General Sherman captured this narrow gauge tunnel in Tunnel Hill, GA, the civil war was essentially over. This was the last major supply line open to the City of Atlanta. The tunnel has been placed on the National Registry of Historic Places.

It is 1,477 feet long and the roof is brick lined. Over the years, water intrusion through the bricks wrecked havoc with them and the mortar holding them in place. Edwin Brady Construction Co., Inc. (see link) of Paris, KY was awarded the contract to repair the tunnel using Mountain Grout SLV.

The install specifications called for the Mountain Grout to stay the water intrusion and then for epoxy to be used to hold the bricks in place. But as the project proceeded it became apparent to Edwin Brady, PE and the overseeing engineers that only the Mountain Grout was needed to perform both functions. Mountain Grout adheres tenaciously to substrata both wet and dry. It stopped the water and also glued the bricks together. This project was especially sensitive due to its historical value and was constantly monitored by civil, state, and federal engineering agencies. All were most pleased with the outcome.