Glossary

An H-section lead or copper strip for holding together pieces of glass in a leaded light or stained glass window.

A quick-setting binder for mortars etc. Examples are ordinary Portland cement and 'natural' cements (such as Roman cement).

A wet mixture of lime and coarse sand used as a plaster, render undercoat or mortar. Can contain hair, especially if used for plastering.

Where the rooms immediately below a roof space are fully insulated and sealed at ceiling level against the loss of heat and water vapour. The roof void, therefore, becomes cold.

One of a series of ordinary timber rafters of equal cross-sectional size that do not form part of a roof truss although they may be carried by one where their loads are transferred onto heavier, principal rafters by purlins. They support the groundwork onto which tiles or slates are fixed.

The process of maintaining and managing change to a heritage asset in a way that sustains and, where appropriate, enhances its significance (as defined in the National Planning Policy Framework 2012).

A batten laid at right angles to, and over or under, other battens; or the process of laying battens at right angles to other battens.

The process of removing hard mortar from joints with a hammer and chisel etc prior to repointing (cf raking out).