• Single Ply Roofing: Usually applied in welded
sheet form, direct to the insulation.
Note: Using the RWS on black EPDM or Butyl rub-
ber roofing may result in false readings due to the
high dielectric constant of this material.
Possible Problems Leading To
Moisture Intrusion Of The Roof System
• Mechanical damage from maintenance personnel.
• Fissures or cracks in the membrane, caused by
building settlement or expansion and contraction.
• Blistering caused by moisture trapped in the roofing
system during construction.
• Problems on the laps and up stands if material is not
fully sealed during construction.
• Problems usually occur from mechanical damage
and maintenance personnel, pinholes, bird damage
and faulty seams during construction.
Moisture Survey Checklist
Recording the following information will assist you in
completing a comprehensive moisture survey:
a) Building Name and Number:
b) Date of Survey:
c) Name of Surveyor:
d) Visual Inspection of all Detail Work and
Flashings around doors, windows, openings etc
e) Visual Inspection of Windows, Doors,
Penetrations, Roof Lights & Openings etc:
f) Visual Inspection of Vents, Chimneys and other
protrusions.
Useful Items Required When Conducting A Survey.
In addition to the RWS the following equipment will
be found useful when carrying out a survey.
1. Core Cutter.
2. Hole Punch.
3. Crayon, Chalk or Spray paint.
4. Tape Measure.
5. Spatula, knife and cold mastic, and patching
material for minor repairs.
6. Plastic bags for sealing core samples.
7. Pin type resistance meter with deep wall
insulated probes.
R.W.S.
User Guide
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