Trade terminology and component identification · Lesson 2 of 4

Trade terminology and component identification: materials, standards and design constraints

Where definitions come from, the split meanings of reglet, cap flashing, clip, fascia, drip edge, cricket and saddle, the catalog's material names, and the standard and maximum sizes.

You will be able to: Say which document defines a word, explain the words that mean two things in different sources, and treat material names and sizes as part of the vocabulary an order depends on.

10 min · 12 slides · 6 questions

All lessons in this module

Slide 1 of 12

Who defines a word

ASTM D1079 is titled Standard Terminology Relating to Roofing and Waterproofing and is kept by ASTM Committee D08.

Drexel's Drip Edge guide letters its own parts, such as the drip edge, a splice plate, a cleat and a miter.

When two sources define a word differently, ask which one the project documents name.

Sources

ASTM D1079 Standard Terminology Relating to Roofing and Waterproofing (the store page lists D1079-26c as the active edition) - ASTM International
Drip Edge Installation Guide (assembly overview, steps 1 to 5, detail and notes) - Drexel Metals

Videos for this lesson

What this video shows: Five clip types named in its description (floating, expansion and contraction, fixed, batten and cleat), described as concealed anchors that attach a panel to the substrate. One supplier's names; use the word in the system guide.

Video: Metal Roofing Clips: 5 Types of Clips and Their Uses by The Metal Roofing Channel, on YouTube. Chosen from the video's published description.

What this video shows: A snap-on coping that its description says uses 20-gauge galvanized steel anchor clips. One maker's coping system, shown as an example of a clip-anchored coping.

Video: PermaSnap Premier Coping Installation by Hickman Edge Systems, on YouTube. Chosen from the video's published description.

Glossary

Reglet: Two meanings: NRCA's glossary calls it a sheet-metal receiver for the attachment of counterflashing; an NRCA article describes reglets as grooves or slots cut into masonry walls.
Receiver: A component in a two-piece counterflashing that may be surface-mounted to a wall, inset into a raggle or embedded behind cladding (NRCA).
Counterflashing: Formed metal or elastomeric sheeting secured on or into a wall, curb, pipe, rooftop unit or other surface that covers and protects the top edge of a base flashing (NRCA).
Gravel stop: A flanged device, frequently metallic, designed to prevent loose aggregate from washing off the roof and to provide a continuous finished edge for the roofing (NRCA).
Raggle: A groove or slot cut in a masonry wall or other vertical surface, for inserting a flashing component such as a reglet (NRCA).
Membrane base flashing: Plies or strips of roof membrane that seal a roof at a horizontal-to-vertical joint and run up the vertical surface; it covers the edge of the field membrane (NRCA).
Cap flashing: In NRCA's glossary, usually metal covering the upper edges of the membrane base flashing or wall flashing, or a flashing covering the top of parapets or columns.
Coping: The covering piece on top of a weather-exposed wall, usually metal, masonry or stone, and sloped to carry off water (NRCA).
Clip: A non-continuous metal component or angle piece used to secure a metal panel to a substrate (NRCA).
Cricket: A construction that diverts water around or away from a chimney, wall, expansion joint or other penetration (NRCA).
Saddle: A small tapered or sloped roof area that helps channel surface water to drains, frequently located in a valley (NRCA).
Fascia: On a steep-slope roof, a board nailed to the rafter ends; on a low-slope roof, the vertical or steeply sloped trim at the perimeter (NRCA).
Gutter: A channeled component along the downslope perimeter of a roof that conveys runoff to the downspouts (NRCA).
Drip edge: A metal flashing or other overhanging component with an outward projecting lower edge that controls the direction of dripping water (NRCA).