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This glossary was designed to help those not directly involved in roofing with their understanding of roofing terminology. Many technical and chemical terms were not included.
L

Laitance: An accumulation of fine, powdery aggregate particles on fresh cement caused by the upward movement of water; indicates that too much water was used in the mix resulting in poor surface adhesion for a waterproofing layer.

Laminated Shingles: See Dimensional Shingles or Architectural Shingles.

Lap: The part of the roofing material that overlaps a section of adjacent material.

Lap Cement: Asphalt-based roof cement used to adhere overlapping plies of asphalt roll roofing.

Lap Seam: Where two material that overlap are sealed together.

Lead: Metal used for flashing material.

Leader Head: A component used to direct water from a through-wall scupper to a downspout. Also known as a Collector Head.

Leader Pipe: A conduit for carrying water from a gutter, scupper, drop outlet or other drainage unit from roof to ground level. Also known as Downspout.

Lift: The rise in Sprayed Polyurethane Foam resulting from a pass.

Live Loads: Temporary items on a roof such as equipment, people, snow, etc. which the roof must be designed to support.

Loose-Laid Roof Membranes: Roofing material attached only at the perimeter and at penetrations and held in place by ballast, pavers, or other materials.

  
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