Moisture stable tuftstring carpet

A pile surface structure comprising:

• a) a backing substrate comprising a non-intersecting array of moisture stable strands spaced apart at a density of 10 strands/inch or less, each moisture stable strand comprising a core of continuous glass filaments and at least one multifilament yarn at least partially wrapped around said core;
• and
• b) a plurality of elongated pile articles each comprising an elongated, moisture stable support strand having bonded thereto a plurality of "U" shaped bundles of multifilament yarn, each bundle defining a pair of upstanding tufts extending from the strand;
• the elongated pile articles placed one next to the other and bonded to the backing substrate with the tufts extending away from the backing and the moisture stable strands of the backing substrate oriented in a cross direction from 45 to 90 degrees to the elongated pile articles, whereby the pile surface structure is a moisture stable tuftstring carpet assembly.