The junction of a roof surface with a wall, or any other structural feature, which arises above it.
Decorative boards mounted under the roofing at a gable end - traditionally timber, nowadays usually uPVC. They may be mounted flash on the end wall or stood off on an overhanging framework with a soffit underneath.
A length of sawn timber - mounted horizontally across the rafters to locate and/or secure the tiles or slates.
A gutter formed in lead at the back of a chimney, or any other structure, which penetrates the roof to disperse water onto tiles/slates.
A roof that has insulation laid horizontally at ceiling level and a void between the insulation and its outer roof structure and covering.
A horizontal row of tiles or slates.
A batten mounted vertically up the roof along the lines of the rafters - normally used where the roof frame has been boarded to give a space when the underfelt and battens are fixed.
A vertical window built into the slope of a pitched roof.
The area just below the lower end of the roof - includes the fascia, soffit and guttering.
The vertical board secured to the ends of the rafters under the lower end of the roof to which the guttering is normally fixed - traditionally timber, nowadays usually uPVC.
The vertical wall at the end of a pitched roof.
A sloping ridge formed by the junction of a pitched roof and a hip end.
A Headlap is what makes the roof watertight and how slates or tiles are lapped on a roof. In the Isle of Man, the minimum headlap is calculated using the severe exposure table.
With slate roofs when the nails have corroded to such a state that they fail to hold the slates.
A vertical, sloping timber used to form the shape of the roof - the side of a truss.
The horizontal line at the top of a pitched roof - applies whether there is a sloping roof on both sides (a Duo ridge), or if there is just one (a Mono ridge).
The horizontal board along the line of the ridge - normally along the top of the rafters or trusses.
Normally a semicircular or angled tile used to seal the top of pitched roofs (and also hips). Usually the tile is secured by mortar and covers the fixings and top edge of the tiles/slates on both sides.
Fibre cement strip, fixed at the verge beneath the battens, onto which the verge tiles/slates are bedded.
A layer of material acting as a barrier between the roof covering and the sub-structure (see felt).
A free end of a roof surface; for example that at the end of a gable or dormer.
The junction of two inclined roof surfaces at an internal angle to provide water run-off; channel to allow roof slopes at different pitches to join together and discharge water into gutters.
A roof that has insulation and a vapour barrier laid above or between its supporting structure (normally on the pitch of the rafters), and immediately below its weatherproof membrane.