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Glossary of Roofing Terms: 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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