PROBLEM AREAS FOR CONTRACTORS
1. Temperature control of asphalt
SOLUTION: use infrared thermometers
2. Mopping Practices
SOLUTION: follow specs and ensure equipment is okay
3. Improper Flashing
SOLUTION: ensure proper height, length of flashing
4. Poor Interply Integrity
SOLUTION: do not install too hot and allow no foot traffic.
5. Dry Laps
SOLUTION: broom felts
6. Inaccurate Head Laps
SOLUTION: use chalk lines and check ply lines
7. Fire Safety
SOLUTION: check thermometers on kettles
8. Gravel Embedment
SOLUTION: embeded gravel quickly and don’t overheat asphalt
9. Poor Base Sheet Attachment
SOLUTION: conduct pull-out tests and relax sheets
10. Lack of Coping Moisture Barrier
SOLUTION: ensure blocking and cap attached properly
Built-up Roofing Membranes – Problem Areas
Built-up roofs are composed of bitumen (either asphalt or coal tar) and glass fiber, polyester or organic reinforcing felts.
- Some of the most common problems and problem areas of built-up roofs
Holes, tears, or abrasions
Fishmouths and buckles (wrinkles)
Surface coating deterioration
Dry side laps
Debris, vegetation and other containments
Inadequate equipment support
Alligatoring or eroding of surface
Crazing or eroding of mineral surfaced cap sheets
Loose or displaced wall and base flashing
Open side laps
Loose mechanical attachment of base flashing
Exposed gaps at the top of base flashing
Penetrations (loose or unbounded membrane flashing)
NOTE: When repairing a BUR the material should be compatible with the type of membrane being repaired. Meaning asphalt-based products should typically be used to repair asphalt BUR and coal-tar based products to repair coal tar BUR.
HOW DO I KNOW IF MY BUILT-UP ROOF IS COMPOSED OF ASPHALT OR COLD-TAR?
Simply conduct a field test – Place a piece of the membrane in a container of mineral spirits and shake. If the material starts to dissolve and turns brown quickly, it is asphalt.