A soil gas extracting apparatus is used to vent hazardous soil gases out of the ground and into the atmosphere. The soil gas extracting apparatus makes use of a compressed air nozzle, a compressed air source, a vacuum-inducing tubular chamber, and a gas-receiving line to safely remove soil gases from the ground. The compressed air source forces air through the compressed air nozzle in order to generate a vacuum within the vacuum-inducing tubular chamber as the air flows into the gas-receiving line. The vacuum draws soil gases into the vacuum-inducing tubular chamber in order for the soil gases to be mixed with the air within the gas-receiving line and vented into the atmosphere.

A radon removal system includes a slab forming part of a foundation of a building, a barrier layer laid under the slab, the barrier layer being vertically gas impermeable and horizontally gas permeable. A gas inlet in the sealed system provides a fluid connection for gas flowing from the barrier layer through a sealed system (for example a sump body with water inlet, sump pump and water outlet) to a gas outlet. A negative pressure generated by the sealed system brings gas from the barrier layer into the sealed system through the gas inlet and out of the sealed system through the gas outlet.

A soil gas extracting apparatus is used to vent hazardous soil gases out of the ground and into the atmosphere. The soil gas extracting apparatus makes use of a compressed air nozzle, a compressed air source, a vacuum-inducing tubular chamber, and a gas-receiving line to safely remove soil gases from the ground. The compressed air source forces air through the compressed air nozzle in order to generate a vacuum within the vacuum-inducing tubular chamber as the air flows into the gas-receiving line. The vacuum draws soil gases into the vacuum-inducing tubular chamber in order for the soil gases to be mixed with the air within the gas-receiving line and vented into the atmosphere.

A radon gas mitigation system and kit for a building with a crawlspace comprises a plurality of radon gas intakes arranged under a vapor barrier in the crawlspace to be in a subterranean environment and outside a building envelope. The intakes are arranged to be respectively registered with one of plural foundation walls and collectively arranged to generally follow the building footprint. The intakes are arranged in spaced relation to the foundation walls. A manifold is arranged in the building envelope and in fluidic communication with the intakes; a fan in the building envelope and in fluidic communication with the manifold and configured to generate an airflow to draw radon gas from the subterranean environment and to the manifold; and an outlet arranged in the building at a location above a grade of ground and in fluidic communication with the manifold and configured to release the radon gas to the outside.

A multilayer membrane may be suitable for construction, and/ir adapted to be installed between a wall of a seat obtained in the ground and a concrete structure. The multilayer membrane may include: a first layer including thermoplastic polymeric material, impermeable or substantially impermeable to water; a second layer including thermoplastic polymeric material, impermeable or substantially impermeable to methane gas and/or radon gas and/or volatile organic compounds (VOC), fixed to the first layer and adapted to be positioned, when the membrane is installed, between the first layer and a concrete structure.

A method and system for monitoring using a sub-slab sensor assembly for a building having a slab includes a housing, a first air quality sensor coupled to the housing and generating a first air quality signal for air above the slab, a second air quality sensor coupled to the housing and generating a second air quality signal for air below the slab and a pressure sensor coupled to the housing. The pressure sensor generates a pressure signal corresponding to the pressure below the slab. A position sensor generates a position signal corresponding to a location of the sensor. A network interface communicates the first air quality signal, the second air quality signal or the pressure signal, or warning signals corresponding thereto and the position signal to a network.