How does the SGM standard specify the membrane should be sealed to flat wall surfaces?

The SGM standard specifies that membranes should be sealed to flat wall surfaces using caulk. Caulk is a flexible sealing material that adheres well to a variety of surfaces, creating a watertight seal that protects against moisture intrusion and helps to ensure the integrity of the radon mitigation system. It allows for some movement and expansion of materials, which is important in maintaining the effectiveness of the seal over time.

Using caulk also provides a smooth finish that can be easier to work with compared to other sealing methods and minimizes the risk of creating gaps, which are potential entry points for radon gas. This is critical in radon mitigation, where the goal is to prevent radon from entering living spaces.

While options such as adhesive tape, screws, and nails might provide some form of attachment, they do not create the same level of reliable seal against air and moisture intrusion as caulk does. Tape may lose its adhesive properties over time, and screws or nails could create puncture points that compromise the integrity of the seal. Therefore, caulk is the most effective option aligned with the SGM standard for sealing membranes to flat wall surfaces.