PROJECT

READY

Indoor Rock Blasting for Island Spa Cold Plunge

Posted March 10, 2026

Rieger Contracting

Built by Rieger Contracting

01 · ABOUT THIS PROJECT

We completed precision indoor rock blasting inside an existing island building to excavate space for a cold plunge spa tub. To execute the work on the island, we staged our 3.5-ton excavator on-site in late fall and hauled the remaining rock drilling and blasting equipment over the ice road during the winter. Using blast mats and careful containment, we broke out the bedrock foundation within the wooden structure. Once excavation wrapped up, we safely demobilized all machinery back across the frozen lake before rising temperatures melted the ice road.

02 · PHOTOS
Excavated bedrock pit blasted into the floor inside a timber-framed spa building.
Floor outline spray-painted on bedrock inside a building prior to rock blasting.
Mini excavator boom positioned at the doorway above blast mats covering the pit.
Tracked mini truck towing an air compressor through snow on an island jobsite.
Mini excavator driving across a frozen snow-covered lake along an ice road.

Created: Mar 10, 2026

03 · DISCUSSION
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Rieger ContractingMar 14, 2026

We use a project called NxBurst. It’s great for small jobs as it’s very safe and easy to use. How to control a blast like what we did here really just comes from experience. This was a 3 week job. Lots of small blasts in order to preserve the building. Also excavating the hole took a very long time reaching in with the excavator. Blast mats were needed for safety.

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Ian MacFaydenMar 10, 2026

How do you determine how to blast it? I know so little about this. Like is there a calculation you have to do? Or you just drill in tnt, put the mat on top and hope for the best?

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PROJECT FACTS

Status

Ready

Posted

March 10, 2026

Crews credited

1

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