Reinforcing member with intersecting support legs

A reinforced structural member comprising:

• a channel presenting a base and a pair of upright side walls;
• a plate overlying said channel to define a cavity bounded by said channel and said plate;
• a carrier positioned in said cavity, said carrier having two intersecting divergent legs diverging at an angle of substantially less than 180 degrees and obliquely angled relative to said side walls, and a shelf positioned above said legs and spaced from said base by said legs;
• a thermally expansible reinforcing material said reinforcing material comprising a styrene-butadiene-styrene block co-polymer, a polystyrene, a rubber, a bisphenol A-based liquid epoxy resin, carbon black, silica, glass microspheres, a blowing agent, a catalyst, and a curing agent;
• and
• a mechanical fastener passing through said expansible material and at least one of said legs for coupling said reinforcing material to at least one of said legs,
• wherein, upon heating and expansion of the reinforcing material, the reinforcing material expands to outwardly past at least a part of said fastener and bond the carrier to the channel.