A concrete slab underlayment product is used at an excavation area at which a concrete foundation slab is to be poured. The underlayment combines a vapour barrier layer with a set of foam insulation bodies. The vapour barrier layer spans fully over the entire set of foam insulation bodies, which are spaced apart from one another at least at lower ends thereof opposite the vapour barrier layer. This leaves drainage/air spaces open between the foam insulation bodies when laid in an installed position atop the floor of an excavated area. In use under a concrete slab, the vapour barrier layer forms a gas and moisture barrier, and the foam insulation bodies and the drainage/air spaces therebetween form a combination of void spaces, drainage channels and insulation blocks between the concrete slab and the floor of the excavation area.

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.

Presented is an apparatus for radon and other soil gas mitigation. The apparatus includes an outer sleeve substantially cylindrical in shape and formed using one or multiple modular structures having foldable flaps with openings. The apparatus further includes a lid for closure of a top opening of the outer sleeve. The lid includes pipe flange(s) configured thereon for allowing a suction pipe to connect at its one end. During operation, other end of the suction pipe is operationally connected to operating inline fan which when operated exerts maximum negative pressure on the surrounding soil to entrain various soil gases that needs to be drawn out of the soil gas prone site (Eg. building).

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 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 disposable formwork for making ventilated loose stone foundations, in particular for floors, slabs, storage and/or collection tanks, dispersion tanks, alveolar concrete beds, cavities and/or similar building structures is described. The disposable formwork comprises a body having a first substantially convex surface intended to receive at least one binding material casting, optionally concrete, and a second surface, facing the opposite side of the first surface, substantially concave and suitable for delimiting, at least partly, a cavity; at least one support element, in particular four, having at least one contact portion arranged to engage a bottom surface of a cavity of a building structure under construction and arranged to support the body according to a position spaced from the bottom surface of the cavity. The disposable formwork has at least one portion made of polystyrene. Preferably, the entire structure of the disposable formwork is advantageously made of polystyrene.

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 vapor mitigation apparatus and method for use with the construction of a building. The apparatus includes a vertical member configured to be affixed to a foundation wall proximate a footing that is supporting the foundation wall. The vertical member has a first end located proximate to a footing and a second end. A horizontal foot is located at the first end of the securing piece. The horizontal foot is configured to rest against the footing. The apparatus may include a mechanical clip located at the second end of the vertical member and is configured to secure a gas impermeable membrane. In the alternative, the vertical member and the gas impermeable membrane are of a unitary structure. The method includes securing the apparatus to the foundation wall, sealing the gas impermeable membrane to a membrane that is covering the footings or granular base of the building and then creating a concrete slab by pouring concrete over the footing and apparatus. The apparatus may also include a membrane material and a rigid ring located at the approximate center of the membrane material. An inner portion of the membrane material is located inside the perimeter of the ring. The rigid ring is configured to be located around one of the at least one penetration such that the inner portion of the membrane material is configured to stretch around the one penetration resulting in the sealing of the apparatus to the penetration.

A temporary radiotherapy facility for use during renovation, upgrading, and/or modernization of an existing facility. The radiotherapy facility includes a central vault room containing a radiation emitting device and a platform for holding a quantity of radiation shielding material above the central vault room. The platform is supported by shear walls that are disposed outside the sidewalls of the central vault room such that the radiation shielding material is supported and suspended above the central vault room without being in contact with or bearing upon the central vault room or affecting the height or level of the central vault room.

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.