| Alligatored |
Shrinking and cracking of a roof surface in
an irregular pattern; like an alligator hide. |
| Asbestos |
Asbestos rock mined from the earth. Fibers
are used to reinforce coatings and other materials. |
| Asphalt |
A hydrocarbon found in natural
deposits or distilled from petroleum. One of the world's finest
waterproofers. |
| Base Sheet |
Bottom layer of ply on a built-up roof. |
| Bitumen |
Either asphalt or coal tar used in roofing. |
| Bleeding |
Discoloration of top coating from
underneath. |
| Blister |
A raised area on a built-up roof where plys
have delaminated. Often caused when moisture turns to vapor from the
heat of the sun. |
| Built-Up Roof |
A roof system made of plys of roofing paper
embedded in hot applied bitumens or cold process coatings. |
| Cap Sheet |
Complete re-covering of existing roof with
new roof membrane. |
| Cold Process |
Roof coatings and cements used without
heating. |
| Composition Roof |
Same as built-up paper roof. Commonly
called mineral roll roofing when it has same mineral surface as
composition shingles. |
| Coping |
Protective covering on top of parapet or
firewall commonly constructed of metal or tile. |
| Core Sample |
A small section cut out of roof, examined
for condition of roof, then replaced and waterproofed on the spot. |
| Corrugated or Ribbed Roof |
Rigid roofing panels with series
of arcs, valleys and ridges for increased strength. |
| Coverage |
Rate of application. Usually refers to
gallons applied per 100 square feet (per roofing square) |
| Dead Level |
Flat roof without slope. |
| Deck |
Structural surface underneath roofing
material. |
| Delamination |
Separation of roofing plys. |
| Eave |
The lower edge of roof extending out
overhanging walls of building. |
| Felt |
Roofing paper used on built-up roofs. |
| Firewall |
Verticle walls extending through roofs
separating sections of buildings. |
| Fishmouth |
A wrinkle along the edge of roofing paper
where it overlaps another layer in a built-up roof. |
| Flashing |
Waterproofing at the point where verticle
areas meet roof areas or where the valleys of two roofs meet. |
