• cobylamarche


Utilities under the floor slab can pose issues for sub-slab depressurization systems. Specifically, we don’t want to drill into them. Yes, the sewer and water services should be at least 300 mm below the slab and covered with gravel, but this is not always the case. These pipes have been known to be installed in the floor slab or immediately below the slab. This scenario can present an unwanted surprise.

What to do? We employ a thermal imaging camera, concrete scanner, and radio detection equipment to clear drilling locations. Even with this technology, our philosophy is to simply stay away from areas where utilities might be.

Staying well away from likely utility locations is not always possible. In-floor heating or an installation that is constrained to a certain area might mean drilling near utilities. In these cases, we use a third-party locating company can employ ground penetrating radar to find the pipes. This presents an added cost to the project, but is always much cheaper that having to repair a utility strike.

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