Soil gas barrier system, and ventilation panel for same

1. A ventilation panel for a soil gas barrier system, the ventilation panel comprising:

an insulating foam body having first and second opposing faces and a plurality of grooves to define, in cross-section, a plurality of first pedestals having a first shape and a plurality of second pedestals having a second shape, the first pedestals and the second pedestals each having at least one wall extending from the second face toward the first face defining a plurality of intersecting ventilation channels therebetween, the intersecting ventilation channels defining only three-way intersections; and

a film of substantially gas-impervious material laminated or adhered to at least one of the first face and the second face.

2. The ventilation panel of claim 1 , wherein the first face defines a surface on which a concrete basement floor slab is cast.

3. The ventilation panel of claim 1 , wherein the insulating foam body has side surfaces between the first face and the second face, and wherein the interconnected plurality of ventilation channels are accessible from at least one of the side surfaces.

4. The ventilation panel of claim 1 , wherein the first pedestals are interposed between four nearest second pedestals, and the second pedestals are interposed between four nearest first pedestals.

5. The ventilation panel of claim 1 , wherein the insulating foam body further comprises connecting features for connecting to an abutting panel.

6. The ventilation panel of claim 5 , wherein the connecting features comprise a tongue formed on a first side surface, and a groove formed on an opposite side surface.

7. The ventilation panel of claim 1 , wherein the first face has at least one underfloor heating groove formed therein, the at least one underfloor heating groove being sized to accommodate underfloor heating tubing.

8. The ventilation panel of claim 1 , wherein the first face has a plurality of upper pedestals formed therein, the upper pedestals being sized to accommodate underfloor heating tubing therebetween.

9. The ventilation panel of claim 1 , wherein the panel comprises a first film of gas-impervious material laminated or adhered to the first face, and a second film of gas-impervious material laminated or adhered to the second face.

10. The ventilation panel of claim 9 , wherein the first film and the second film are separate films.

11. The ventilation panel of claim 9 , wherein the second film conforms to the walls of the channels and to the bottoms of the grooves.

12. The ventilation panel of claim 1 , wherein aligned linear edges defined by the second pedestals are interrupted by the first pedestals, thus reducing the total length of aligned linear edges along the second face.

13. A soil gas barrier system for a building, comprising:

a plurality of soil gas barrier ventilation panels, each ventilation panel comprising:

an insulating foam body having first and second opposing faces and a plurality of grooves to define, in cross-section, a plurality of first pedestals having a first shape and a plurality of second pedestals having a second shape, the first pedestals and the second pedestals each having at least one wall extending from the second face toward the first face defining a plurality of intersecting ventilation channels therebetween, the intersecting ventilation channels defining only three-way intersections; and

a film of substantially gas-impervious material laminated or adhered to at least one of the first face and the second face; and

a ventilation stack in fluid communication with the ventilation channels of the plurality of ventilation panels, the ventilation stack being configured to convey soil gas to an exterior of the building for discharge.

14. The system of claim 13 , wherein the first faces of the ventilation panels define a surface on which a concrete basement floor slab is cast.

15. The system of claim 13 , wherein each insulating foam body has side surfaces between the first face and the second face, and wherein the interconnected plurality of ventilation channels are accessible from at least one of the side surfaces.

16. The system of claim 13 , wherein the first pedestals are interposed between four nearest second pedestals, and the second pedestals are interposed between four nearest first pedestals.

17. The ventilation panel of claim 13 , wherein aligned linear edges defined by the second pedestals are interrupted by the first pedestals, thus reducing the total length of aligned linear edges along the second face.

18. A ventilation panel for a soil gas barrier system, the ventilation panel comprising:

an insulating foam body having first and second opposing faces and a plurality of grooves to define, in cross-section, a plurality of first pedestals having a first shape and a plurality of second pedestals having a second shape, the first pedestals and the second pedestals each having at least one wall extending from the second face toward the first face defining a plurality of intersecting ventilation channels therebetween, the intersecting ventilation channels defining three-way intersections; and

a film of substantially gas-impervious material laminated or adhered to at least one of the first face and the second face,

wherein the first pedestals are interposed between four nearest second pedestals, and the second pedestals are interposed between four nearest first pedestals, and

wherein the second pedestals have a rounded cross-shaped profile with rounded inner corners, and the first pedestals are cylindrical.

19. A ventilation panel for a soil gas barrier system, the ventilation panel comprising:

an insulating foam body having first and second opposing faces and a plurality of grooves to define, in cross-section, a plurality of first pedestals having a first shape and a plurality of second pedestals having a second shape, the first pedestals and the second pedestals each having at least one wall extending from the second face toward the first face defining a plurality of intersecting ventilation channels therebetween, the first pedestals and the second pedestals being arranged such that the ventilation channels are impeded, causing fluid flow to be diverted in different directions; and

a film of substantially gas-impervious material laminated or adhered to at least one of the first face and the second face.

20. The ventilation panel of claim 19 , wherein aligned linear edges defined by the second pedestals are interrupted by the first pedestals, thus reducing the total length of aligned linear edges along the second face.