| Intrados: | The internal or lower curve of an arch.... | |
| Inverted Arch: | Sometimes required in the foundation work of large buildings when dead loads are concentrated, at in... | |
| Jambs: | The piers (not less than 200mm thick) that support the chimney breast and form the sides of the fire... | |
| Joggle: | A process used to increase the strength of Gauged Arches. When the voussoirs have been cut, and rubb... | |
| Jointing Iron: | Used for the specialised process of Tuck Pointing (see Decorative Work). The heavy flat blade, set i... | |
| Key Brick: | Only present in Axed or Gauged Arches. The voussoirs are set out so that the centre line of a key br... | |
| Keyed Brick | These are made with a series of vertical dovetailed indents on one face that act as keys for interna... | |
| Kiss Marks | A regular cross discolouration on the face of bricks resulting from the stacking of unfired bricks o... | |
| Knee pads | used by roofers to protect their knees when kneeling constantly on the roof.... | |
| Knife. | Mainly used for cutting underlays or similar... | |
| Knobbing Out | Operatives term for loading out the roof with slates or tiles when the labourer would put a Ò... | |
| Laced Valley | A valley formed the by use of tile and half or slate and half laid at an angle over lay boards, caus... | |
| Lacing Course: | One or two courses of brickwork to provide horizontal reinforcement in walls of flint or cobble.... | |
| Laser Level | Mechanical device mounted on a rotary tripod base to establish and to transfer levels using flashing... | |
| Lath | Piece of sawn or split timber as a support for plaster or for marking to form a gauge rod.... | |
| Lath Axe | Used for driving batten nails etc. At one time used to chop off cuts of slating / tiling battens ove... | |
| Lathe | (or Battens or Lattes) Horizontal lengths of timber fixed to the roof rafters to support the slates ... | |
| Lattes | (or Battens or Lathe) Horizontal lengths of timber fixed to the roof rafters to support the slates o... | |
| Laying on Trowel | Tool for applying cement render or adhesive to wall surface.... | |
| Layout Stick | A wooden strip or batten, marked at appropriate joint intervals to assist in setting out.... | |
