01 May 1999
field inspector, and other related subcontractors should be present. Fire safety should be an agenda
c. Shop Drawing Submittals. Drawings of intersections of expansion joints, curbs, edging,
flashings and coping should be required. These should be detail specific and dimensioned, not
manufacturer's standard detail plates.
d. Design Submittal Requirements and Checklist.
(1) Manufacturer Assurance. Require the manufacturer to verify in writing that the proposed
system is compatible with the roof deck, vapor retarder, and insulation and is appropriate for this
(2) Application Manual.
Require submittal of foreman's application manual. Discuss any
(3) Start-Up. On major roofing projects require startup assistance and periodic inspection by
(4) Base Sheets. Use nailed, asphalt coated or modified base sheet for the first ply in MB
roofing membranes installed over wet decks (e.g., poured gypsum, and lightweight insulating concrete
(5) Bitumen. Mopping bitumen should be as specified. Generally this will require ASTM D312
Type III or Type IV asphalt.
e. Field Review and Observation.
(1) Inspection. Full time visual inspection by qualified inspectors is recommended. Is the
installation following the manufacturer's application instructions? (Usually available in the foreman's
(2) Torching. If torching is being performed, are safety requirements being followed? Are the
individuals using torches safety certified? Do propane tanks have pressure regulators? Are tanks
shut off at the cylinder and in-line gas burned off during the lunch break; overnight? Is a fire watch in
place? Are fire extinguishers present?
5-5. MAINTENANCE CONSIDERATIONS.
a. General. MB roofing is heavily dependent upon inspection and maintenance especially at
seams, flashing, and penetrations. Procedures listed in the joint NRCA/ARMA/SPRI and RIEI
maintenance manuals should be followed.
b. Repair or Replace. MB repairs are relatively uncomplicated, and may be effected by solvent
based mastics with MB membrane, or by applying torched in place repairs. Surface preparation and
priming are needed.
Repairs: Emergency, Temporary, and Permanent.
(1) Emergency repairs. Expedient repairs may be made using asphalt mastic, peel and stick
MB sheets, duct tape, or application of bentonite clay or portland cement powder to limit moisture
intrusion. As soon as weather permits temporary or permanent repairs must be made.
(2) Temporary repairs. Patching generally consists of embedding reinforcing fabric into a cold
applied asphalt mastic (ASTM D4586). Cleaning and priming of the tie-in area is needed.