Roof Membranes are Manufactured in the Field!
A critical step in commercial roofing, the quality of this process influences:
Maintenance Requirements (annual expenses)
Serviceable Life of the Roof System (TCO/ROI)
NOTE: This is where most Built-Up Roof system failures begin.
As the name suggest, Inter-Ply Felt is inter-twined and bound through a process
of overlapping the layers of felt
(Figure III) and penetrating
the layers of felt with hot asphalt.
Contaminants, both native and foreign can develop during this manufacturing process.
Moisture and other weather elements are the most understood foreign contaminants.
Simple errors in workmanship and attention to detail can be easily overlooked
allowing contaminants into the final membrane during the manufacturing process.
Further, roofing professionals can introduce many different types of undesirable
elements through material handling.
Most imperfections observed within the adhesion layers of inter-ply felt
occur during manufacturing (the bonding process) as they are converted
to a single layer of waterproofing called the roof membrane. It's this
final production of the membrane that provide roof systems with measureable
Layers of Inter-Ply Felt
(Figure I) are bound together on the roof.
NOTE: Inappropriate material handling failures may appear immediately
or could evade discovery until the service warranty has expired.
Asset Value Affects
Asset Values are reduced immediately. Deficiencies introduced during installation affect
nearly all investment models (ie: Life-Cycle, NPV, PV) while increasing Annual Maintenance,
TCO (Total Cost of Ownership) and reducing the assets' Servieable Life.
publishes a Present Value Financial Forecast Model for commercial buildings
and building envelope systems. CRS Consultants inserted current day data on
different types of roof systems and published a comparison forecast for the
three most common approaches to
Commercial Roof Asset Management (CRAM).