Hot Bituminous – Top 10 Problems and Solutions

HOT BITUMINOUS

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 Roofs – Potential Problems and Problem Areas

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
    Membrane deterioration
    Dry side laps
    Blisters
    Debris, vegetation and other containments
    Inadequate equipment support
    Ponding water
    Alligatoring or eroding of surface
    Crazing or eroding of mineral surfaced cap sheets
    Splits
    Fastner back-out
    Loose or displaced wall and base flashing
    Open side laps
    Deteriorated flashing
    Scuppers
    Pitch pans
    Interior drains
    Interior gutters
    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.