Code requires that only one existing roof membrane may exist
under a proposed membrane. Use of infra-red moisture detection or other
methods may be used on very large roofs.
After the field research is complete, recommendations
are made to the Owner regarding whether or not the existing membrane(s) must be
removed, if existing insulation is wet and must be replaced, if deteriorated
deck is found and extents, and examination of laboratory reports for asbestos
content. Solutions for eliminating ponding and poor drainage are designed
in the office using measurements taken during the field data gathering.
Design Solutions and Roofing Details
Selection of alternative membranes is discussed with
the Owner and decisions are made based on life cycle costs, initial costs,
maintenance, warranties, available experienced local roofing contractors, and
proven backup from manufacturer’s technical representatives. We favor
using proven membrane systems which we have seen perform, and are very cautious
about recommending and approving unknown materials and manufacturers.
Clear and complete plans, details and technical
specification documents are prepared that address all conditions encountered on
Construction Submittal Manuals\ Permanent
Record of Project for Owner
Submittals, product and installation manuals are required from the roofing
contractor and each is reviewed for content. On the job, these manuals are
important cohesive references to be used by the superintendent and inspector.
These manuals are the place where as-constructed field changes are noted for a
record of the project. One copy of this manual is furnished to the Owner
for permanent record.
Observation of the Construction Work
We strongly recommend a close working relationship
between roofing consultant\designer and the contractor’s field personnel.
A preconstruction conference is an essential starting point for the project
followed by periodic (at least once per week) visits to the site at pre-set
times. A record of observations and field changes should be kept by the
designer’s representative. Instructions on the replacement of deteriorated
deck should be clearly understood by field personnel and a record kept of the
replacement. Final inspection of the work is the joint responsibility of
the owner’s inspector, the contractor field supervisor and a manufacturers’
field representative if required by the warranty.