21 21 is positioned over the solid rubber particle fill 20 20 and the remaining portion of trenches 10 10 may be filled with soil fill 22 22 equal spaced at selected distances in the footer 12 12 are radon vents 23 23 which are located just under the basement floor 14 and connect the space underneath the basement floor with the filled area in the trenches 10 10 which has been filled with solid rubber particle fill 20 20 radon vents 24 24 are located in the solid rubber particle fill 20 20 in the trenches 10 10 and exhaust to the open atmosphere a vapor barrier 25 such as 4 mil visqueen u00ae may be used above the rubber particle fill 20 20 and under the basement floor 14 it is also preferable to caulk the joints 26 26 between the basement floor 14 and the foundation walls 13 13 in operation the water from the adjacent soils 16 16 and 22 22 will trickle down through the solid rubber particle fill 20 20 in the trenches 10 10 underneath the basement floor 14 into the drain tiles 19 19 and 17 17 where it will be transported away from the foundation walls 13 13 and the basement floor 14 likewise any accumulation of radon gas underneath the basement floor 14 will be permitted to expand through the solid rubber particle fill 20 20 underneath the basement floor 14 through the vents 23 23 and then up through the solid rubber particle fill 20 20 and exhaust into the atmosphere through vents 24 24 this system will also vent the radon gas in the soil adjacent the foundation walls 13 13 namely in the soils 16 16 on the sides of the trenches 10.