A horizontal member attached perpendicular to the truss top chord for support of the roofing (i e , corrugated roofing or plywood and shingles)
(in systems-engineered metal buildings) means a Z- or C-shaped member formed from sheet steel spanning between primary framing and supporting roof material
In timber roof construction, a secondary hori-zontal component parallel to the ridge and supported at each end by a rafter
-A roof support beam that runs parallel to the ridge beam and the long sides of a home
s: Horizontal pipe along top of bow that runs the length of the structure Example
Purlins are metal tracks used to support metal roofs or siding Purlins can also mean the members placed at right angles to rafters to break up the roof board span