Drip edge

A channel that collects rainwater run-off from a roof and conveys it to outlets and downpipes. Gutters may be eaves-mounted, formed as valley or parapet gutters within the roof, or integrated into metal roofing systems, and are sized by rainfall calculation.

The lower horizontal edge of a roof slope, usually projecting beyond the wall face, where rainwater is discharged into the gutter. Eaves details typically include the fascia, soffit, ventilation openings and underlay support to prevent water being trapped behind the gutter.

A strip of impervious material, traditionally lead but also aluminium, zinc, copper or polymeric products, dressed over joints and junctions such as upstands, abutments and chimneys to shed water over the waterproofing below. Cover flashings are typically let into masonry chases and dressed down over membrane upstands.

The edge of a pitched roof at a gable, where the roof covering meets or oversails the end wall. Verges are finished with mortar bedding, dry verge systems or bargeboards to close the covering against wind and rain.