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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.
Layers of Inter-Ply Felt (Figure I) are bound together on the roof. Built-Up Roof Systems: Membrane Layers at Installation FIGURE III


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.

Adhesion Imperfections
Most imperfections observed within the adhesion layers of inter-ply felt (Figure IV) 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 tensile strength.

Built-Up Roof Systems: Membrane Layers at Installation FIGURE IV
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.

ASTM International 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).
©2008 Copyright. All rights reserved. CRS Roof Consultants, LLC
1361 Winchester Blvd, Suite 207
San Jose, CA 95128
(408) 871-9296 • (408) 871-9295 fax
Member of Silicon Valley BOMA