Rafter (or common rafter):

A sloping timber section or beam supporting the roof.

Reinforced concrete:

Concrete which incorporates wire mesh or a series of metal rods to provide additional strength.

Render:

A compound, usually cement based, applied to the outer face of a wall, either smooth finished or textured.

Retaining wall:

A structure built to retain land which is higher on one side of the wall than the other.

Ridge and hip tiles:

Tiles which are located at the apex of the roof and at the junction between two roof slopes respectively.

Ridge board:

A horizontal section of timber at the apex of the roof into which the rafters are fixed.

Ridge:

The junction of two roof slopes at the apex of a roof.

Rising dampness:

The term given to the process by which moisture rises up a wall by capillary attraction, due to the absence or failure of a damp proof course.

Rodding eye:

A small, covered opening in the ground giving access to underground drains for rodding or cleaning.

Roof bracing:

Timber battens extending diagonally across the slope of a roof, fixed to the trussed rafters as a means of providing lateral stability.

Roof truss:

A framed structure designed to support a roof.

Roof verge:

The edge of the roof where it meets a gable wall.

Rooflight:

A window set within the plane of a sloping roof.

Rubble stone (or random rubble):

Stonework laid in an irregular pattern, using natural stones of a variety of shapes and sizes.