Foundation vent structure

A foundation vent structure for use in providing a moisture vent joint between each vertical wall and the footing of a basement, and below the basement floor, the vertical walls of the basement being formed of hollow concrete blocks having an interconnecting web between the sides thereof to define vertically oriented openings therein, drain tile being positioned below the marginal portions of the basement floor, said vent structure being formed of a flexible, impervious plastic material and being of elongate generally rectangular shaped configuration having substantially straight, parallel longitudinal edges, said vent structure being shaped throughout its length to define alternate tunnels and channels, said tunnels and channels extending transversely from one longitudinal edge to the other longitudinal edge of the vent structure, each tunnel and each channel including substantially, parallel vertical sides integral with and interconnected by a web, each vertical side being common to an adjacent tunnel and channel, the webs of the tunnels and channels being perforated to permit moisture to pass through the perforations, said vent structure being adapted to be positioned upon the footing of a basement wall along substantially the length of the footing and below the lowermost row of concrete blocks, said vent structure having a width dimension of sufficient magnitude to extend beyond the inner edge of the footing below the basement floor and to the central portion of the concrete blocks to intercommunicate the opening in the concrete blocks with the perforations in the webs of the tunnels and channels to permit water and moisture to be vented below the basement into the drain tile thereof.