The present invention relates to a method for reducing a flow of soil air to the indoor air in a building (1), wherein the building comprises at least one wall (2), which wall comprises a permeable channel (23) connected with soil air, wherein the method comprises achieving a flow stop (24) for the soil air in the permeable channel (23). The invention also pertains to a device to reduce the flow of soil air to indoor air in a building (1).

A membrane 10 is a geomembrane 10, which takes the form of a non-conductive sheet 11. A conductive layer 13 is printed on to the sheet 11, in this instance in a geometric pattern of a rectangular grid. The lines of the grid 13 are conductive and connected to each other, with non-conductive gaps 15 disposed between the grid lines. Accordingly, a conductive linear network is formed, which has the requisite conductivity for leak detection.

A barrier tape comprises a barrier section comprising one or more barrier layers and one or more adhesive layers adhered to a face of the barrier section. The barrier tape can be used to join together adjacent barrier sheets or to patch a breach in a barrier sheet to form a barrier assembly.

A construction method includes a charcoal paint application step in which a charcoal paint is applied to at least one of a floor, a wall, and a ceiling within a construction target room; an arrangement step in which flooring members made of Obi-sugi are arranged on the floor of the room; a diatomaceous earth application step in which diatomaceous earth is applied to the wall of the room; and a spraying step in which an antioxidant aqueous solution is sprayed on at least one of the floor on which the flooring members are arranged, the wall to which the diatomaceous earth is applied and the ceiling to which the charcoal paint is applied.

A building panel may be installed below a slab in the construction of buildings. The building panel supports the slab and also provides a ventilation layer that may be depressurized to eliminate or reduce infiltration of radon gas into the building. The ventilation layer may comprise channels which provide a two-dimensionally interconnected void. Ventilation panels which include collars for connecting to ventilation systems may be provided. The panels may be installed directly on compacted soil. The building panels may additionally provide sub-slab insulation and/or a capillary break for water drainage. In some embodiments the building panels are formed substantially entirely of thermal insulating material such as rigid polystyrene foam. In an example embodiment the panels are approximately 4 inches thick and have a grid of intersecting channels formed on an underside of the panels.

A radon gas and/or moisture abatement system (or method) is located under the concrete slab of a building. The system (or method) includes a multilayered mat having a first layer, a second layer, and a third layer sandwiched between the first layer and the second layer. The first layer is non-permeable and faces the concrete slab. The third (or sandwiched) layer is an entangled net. The second layer is permeable layer. The layers are bonded together. Whereby radon gas and/or moisture are inhibited from entering the building by passing through and collecting in the multilayer product.

A controller for controlling a system for mitigating the flow of vapors from contaminated soil into a building controls a blower pulling an exhaust from underneath the sub slab of the building and blowing the vapors away from the building. The blower is controlled by pressure sensors that measure the pressure drop across the sub slab. The sensors are monitored by the controller to make sure they all have a minimum pressure drop. If any of the sensors have an inadequate pressure drop, the blower speed is increased a small amount by the controller. If all of the sensors have adequate pressure drop, then the blower speed is decreased by a small amount. The controller then rechecks the pressure drops on a periodic basis and makes appropriate blower speed adjustments after each measurement.

A dual channel drainage seal for enclosing a joint between a slab and a foundation sidewall of a subterranean area. The drainage seal includes and lower channel and an upper channel stacked over the lower channel. The lower channel is affixed on top of the slab and against the sidewall to form and enclosed channel for retaining and routing radon and/or water seepage at the joint to a sump pit. The upper channel is open on top and configured to capture and route water seepage from the sidewall above to the sump for discharge, thereby protecting the interior portions of the slab from radon and water damage.

A building panel may be installed below a slab in the construction of buildings. The building panel supports the slab and also provides a ventilation layer that may be depressurized to eliminate or reduce infiltration of radon gas into the building. The ventilation layer may comprise channels which provide a two-dimensionally interconnected void. Ventilation panels which include collars for connecting to ventilation systems may be provided. The panels may be installed directly on compacted soil. The building panels may additionally provide sub-slab insulation and/or a capillary break for water drainage. In some embodiments the building panels are formed substantially entirely of thermal insulating material such as rigid polystyrene foam. In an example embodiment the panels are approximately 4 inches thick and have a grid of intersecting channels formed on an underside of the panels.

A system for mitigating the flow of vapors from contaminated soil into a building has a blower pulling an exhaust from underneath the sub slab of the building and blowing the vapors away from the building. The blower is controlled by pressure sensors that measure the pressure drop across the sub slab. The sensors are monitored to make sure they all have a minimum pressure drop. If any of the sensors has an inadequate pressure drop, the blower speed is increased by a small amount. If all of the sensors have adequate pressure drop, then the blower speed is decreased by a small amount. The system then rechecks the pressure drops on a periodic basis and makes appropriate blower speed adjustments after each measurement.