Core and shell composite structural member

A core shell structural member consisting of:

• (i) a shell comprising a polyvinyl chloride fiber composite material, comprising about 10 to 50 wt. % fiber, the balance comprising polyvinyl chloride, the shell having a thickness of about 0.5 to about 3 mm;
• and
• (ii) a core comprising of a polyvinyl chloride foam having a foam density of 0.1 to 1 g-cm−3, wherein the structural member core has a width of about 5 to 30 centimeters, a thickness about 1 to 3 centimeters, and typically a length of less than about 10 meters;
• and wherein the member comprises a shell surrounding 3 or more core structures each core structure defined by a separator, each core structure is enclosed by the shell and the K value of the shell is greater than the K value of the foam.