http://en.wikipedia.org/wiki/Batten

"Roofing battens are used to provide the fixing point for roofing sheet or roof tiles. The orientation and spacing of the battens depend on the type of roof. Battens may be oriented at right angles to the trusses or rafters of a roof like purlins. They may be parallel to the slope of the roof, as on a batten-seam roof, where the battens cover seams in the roofing material and are themselves covered by metal caps. Some roofs may use a grid of battens in both directions, known as a counter-batten system."

Lūk, tāds stienis, tekstā lietots kopā ar vārdu "karnīze". Kā to stieni sauc latviski?
Heh, tagad zināšu arī, ka "purlin" ir kaut kāda "jumta lata".