hole_in_basement_concrete
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| hole_in_basement_concrete [2025.06.28 16:39] – Steve Isenberg | hole_in_basement_concrete [2025.06.28 16:41] (current) – [Sealing a Plumber’s Box Hole Using Nashua 324A Tape] Steve Isenberg | ||
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| A plumber’s box is a rectangular hole in the basement concrete slab, commonly found in older homes (e.g., built in the 1950s). It allows access to sewer pipes beneath the floor. These openings can act as direct radon entry points. | A plumber’s box is a rectangular hole in the basement concrete slab, commonly found in older homes (e.g., built in the 1950s). It allows access to sewer pipes beneath the floor. These openings can act as direct radon entry points. | ||
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| === Do You Need to Keep It Accessible? === | === Do You Need to Keep It Accessible? === | ||
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| * You’ve had sewer line issues in the past. | * You’ve had sewer line issues in the past. | ||
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| === Risks of Sealing It Permanently === | === Risks of Sealing It Permanently === | ||
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| | Continued radon entry if not sealed properly | Moderate | Use proper sealing materials | | | Continued radon entry if not sealed properly | Moderate | Use proper sealing materials | | ||
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| === Recommended Permanent Sealing Steps === | === Recommended Permanent Sealing Steps === | ||
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| - Optionally embed a capped pipe or box for future access. | - Optionally embed a capped pipe or box for future access. | ||
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| === Temporary Covering Option (Short Term) === | === Temporary Covering Option (Short Term) === | ||
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| **Note:** This is only a temporary measure. It is not airtight and should not be considered a permanent radon mitigation solution. | **Note:** This is only a temporary measure. It is not airtight and should not be considered a permanent radon mitigation solution. | ||
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| === Summary === | === Summary === | ||
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| ====== Sealing a Plumber’s Box Hole Using Nashua 324A Tape ====== | ====== Sealing a Plumber’s Box Hole Using Nashua 324A Tape ====== | ||
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| === Purpose === | === Purpose === | ||
| Temporarily or semi-permanently seal an open plumber’s box hole in the basement floor to reduce radon entry and soil gas infiltration. | Temporarily or semi-permanently seal an open plumber’s box hole in the basement floor to reduce radon entry and soil gas infiltration. | ||
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| === Materials Needed === | === Materials Needed === | ||
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| * Wooden board (to cover and protect the plastic sheeting) | * Wooden board (to cover and protect the plastic sheeting) | ||
| * Weights (e.g., concrete block or heavy object) | * Weights (e.g., concrete block or heavy object) | ||
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| === Preparation === | === Preparation === | ||
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| * Allow surface to dry fully for better tape adhesion. | * Allow surface to dry fully for better tape adhesion. | ||
| - Cut plastic sheeting large enough to cover the hole and extend at least 6–12 inches beyond the hole edges onto clean concrete. | - Cut plastic sheeting large enough to cover the hole and extend at least 6–12 inches beyond the hole edges onto clean concrete. | ||
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| === Sealing Steps === | === Sealing Steps === | ||
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| - Place the wooden board on top of the sealed plastic for extra protection. | - Place the wooden board on top of the sealed plastic for extra protection. | ||
| - Set weights on top of the board to prevent accidental shifting. | - Set weights on top of the board to prevent accidental shifting. | ||
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| === Notes === | === Notes === | ||
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| * Nashua 324A is suitable for this application due to its high adhesion, vapor barrier properties, and UL certification. | * Nashua 324A is suitable for this application due to its high adhesion, vapor barrier properties, and UL certification. | ||
| * This setup allows for later permanent sealing if necessary. | * This setup allows for later permanent sealing if necessary. | ||
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| === Long-Term Options === | === Long-Term Options === | ||
hole_in_basement_concrete.1751153977.txt.gz · Last modified: by Steve Isenberg