Dictionary

Rebate

A recess or groove cut into the edge of a piece of wood e.g. a window sill. Makes provision for the insertion of a pane of glass and putty or for another piece of wood.

It is also used in door and casement window jambs, e.g. on the edge of the casement, where it overlaps the frame. The natural ‘air’ between frame and casement  is hidden.

Recess

The opening in the wall in which the window is mounted.

Renaissance window

A window from the architectural period the Renaissance, about 1500-1630. A distinctive window from this period is a fixed multi-light sash with lead work. The panes are made of crown glass, may be coloured and/or decorated. See also leaded lights.

Rococo window

A Window from the architectural period the Rococo, about 1725-1780. A distinctive window from the period is the multi-light casement window with multiple casements. The bottom casements may be larger than the top casements.

Roller shutter

A shutter made of rails to be rolled down before the window.

Romanesque window

A window from the architectural period the Romanesque about 1050-1250. A distinctive window from the period has round arches and is often seen in churches from same period. Also called ‘Norman’ window.

Roof dome

Window construction for roofs with no or very low pitch. The dome is made of one or more layers of synthetic material, typically acrylic.

Roof window

A window to be installed in the sloping roof and primarily for heated rooms. On the outside, the window has a metal cladding and a special flashing to ensure a wind and watertight installation in the roof.

Rose window

Round window divided into segments by stone mullions and tracery. The term “rose window” is reserved for those windows of more complex design which can be seen to bear similarity to a multi-petalled rose. May have glass paintings. Often found in church gables. Also called Catherine window.

Russian window

A window type invented for the Winter Palace in St. Petersburg, Russia. A double-glazed window consisting of two windows built together to a unity. The outer window has an operable sash at the bottom and the inner an operable sash. In addition to a good insulating power the system reduces heat loss during ventilation, because the fresh air is preheated on its way inside. At the same time the system is sound-absorbing.

Rw

The value measuring the sound-absorbing feature of a window.