Patent ID: 7891149

Claim:
A composite floor structure comprising a plurality of interconnected fiber reinforced thermoset polymeric planks supported on floor joists; said planks having a first and a second side, a thin base connecting said sides, a plurality of elongated solid ridges extended from said base and extending along a length of said planks establishing open areas there between; wherein said ridges have a base portion and a distal portion wherein said base portion is narrower than said distal portion forming areas between said ridges having generally trapezoidal cross sectional configurations; said planks having a height measured from said base to an upper surface of said ridges being from about 13/32 to about ¾ inch; and a rigid covering layer supported by and covering said planks, said rigid covering layer selected from the group consisting of ceramic tile, porcelain tile, stone and terrazzo and said floor having a break strength of at least about 7,019N.