Abstract: A batten assembly for use in sealing the edges of roofing sheets includes a plurality of clips secured to the roof at spaced intervals along the slope of the roof with upward extending legs which pass through longitudinal slots in outwardly extending flanges along each side of the lower portion of a batten and are bent inward and downward over the upper edges of spaced apart longitudinal side walls of the batten to firmly secure the batten to the roof. The edges of the roofing sheets are bent upward and then inward and downward over the batten side walls and the legs of the clips and are retained in place by a cap strip which is secured to the batten by bolts threaded into sliding nuts engaged by internal flanges in the batten. A continuous longitudinal cross member in the batten, below the internal flanges, forms a water-tight channel with the side walls to carry off water which could seep into the batten over the top edges of the roofing sheets or around the cap strip bolts.