Concrete slab-wall spacer with water and radon removal features

In a water removal system for floating slabs comprising, in combination:

• a slab perimeter wall having an interior face;
• a footing, upon which the slab perimeter wall rests;
• a water seepage control device, resting on the footing;
• and
• a floor slab being disposed on the water seepage control device, an improvement of said water seepage control device comprising:
• a cross-sectionally L-shaped strip of semi-rigid, nonbiodegradable material having a vertical portion disposed orthogonally with respect to a conterminous horizontal portion, said strip projecting an integral shelf means at least halfway up the vertical portion opposite and lying in a plane essentially parallel to the horizontal portion, said strip further including a liftable flap to attach a gas impermeable barrier to the strip extending substantially parallel to the horizontal portion.

3. A slab-wall spacer positionable between a floor slab and a slab perimeter wall having a footing, the slab-wall spacer comprising:

• an L-shaped strip of semi-rigid, nonbiodegradable material having a vertical portion integrally and orthogonally disposed with respect to a horizontal portion;
• a shelf extending from at least halfway up the vertical portion in the opposite direction than the horizontal portion, the shelf adapted to nearly abut the slab perimeter wall to form a chamber between the shelf, footing and slab perimeter wall;
• and
• at least one conduit extending through at least one vertical slot in the shelf for fluid communication with the chamber.

A water seepage control device for draining a floor slab and slab perimeter wall comprising in combination:

• a slab perimeter wall, having an interior face;
• a footing, upon which the slab perimeter wall rests;
• a floor slab;
• a cross-sectionally L-shaped strip of semi-rigid, nonbiodegradable material, the strip including:
• a vertical portion disposed orthogonally with respect to a conterminous horizontal portion, the horizontal portion being on the footing and the floor slab resting on the horizontal portion,
• an integral shelf extending from at least halfway up the vertical portion in a direction opposite to the horizontal portion, the integral shelf extending toward the interior face of the slab perimeter wall to form a chamber defined by the vertical portion, the footing and the interior face of the slab perimeter wall, the shelf also including at least one vertical slot extending therethrough;
• and
• a conduit extending from the chamber through each slot for scavenging radon form said chamber.

A radon barrier system for use between a floor slab and a slab perimeter wall having a footing, the radon barrier system comprising:

• an elongated L-shaped strip of nonbiodegradable material having a vertical portion integrally and orthogonally disposed with respect to a horizontal portion;
• a shelf extending from and along the length of the vertical portion in a direction opposite the horizontal portion, the shelf adapted to nearly abut a slab perimeter wall;
• and
• a plurality of grooves provided in a bottom surface of the horizontal portion, the bottom surface being adapted to rest upon a footing and a radon barrier attached to said horizontal portion of said L-shaped strip.