Glossary

R

Rw

An acoustic measurement denoting the “weighted average sound reduction index” and used to describe the performance of a door assembly over a range of frequencies, but expressed as a single comparable figure – eg, 29dB Rw.

Rail

A horizontal reinforcing element in a door leaf construction.

Ramp

A sloping plate used to facilitate a smooth transition from one floor level to another.

Rebate

The part of a door frame created by the presence of the stop, and forming a recess for the edges of the door leaf.

Resilience

The ability of a flexible sealing element to recover quickly from deformation caused by compression or other locally applied force.

Reveal

The side of the door frame, revealed by opening the door.