JOIST- Horizontally placed timber or beam set on edge to give support to a floor or ceiling.
KETTLE- Equipment used for heating bitumen to a flowing consistency.
LADDER, FIXED- A ladder which is permanently attached to a building.
LAP- To overlap or extend one material partially over another.
LEAD- A malleable metal once extensively used for flashings.
LEAN-TO ROOF- The sloping roof of a building addition having its rafters or supports pitched against and supported by the adjoining wall of a building.
LIQUID-APPLIED MEMBRANE- Generally applied to cast-in-place concrete surfaces in one or more coats to provide fully-adhered waterproof membranes which conform to all contours.
LIVE LOAD- The weight superimposed by snow or water or other tangibles which lack permanency, not including the wind load, on a roof.
LOOSE LAID- A membrane "laid loosely", i.e., not adhered, over a roof deck or BURM