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R e s o u r c e s
CCG maintains high standards of excellence, company wide, by promoting and providing continuous educational resources to both our employees and the clients and associates with whom we work.
 
 
On this page you will find a variety of industry resources that we use and would like to share with you.  We use white papers, independent research studies, technical bulletins and articles to keep us informed of what's new in the world of materials, methods, and procedures. 
 
 
The documents on this web-page are provided as a resource only.  CCG makes no claim to the validity or accuracy of the documents shared on this resource page.  These documents were not written by or created for any employee of Crenshaw Consulting Group LP unless explicitly stated.  The owner of the document as published reserves all rights.
 
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Executive Summary ♦
 
Nondestructive Evaluation (NDE) roof moisture surveys have been employed in the roofing industry in the United States since the late 1970s to locate areas of moisture contaminated insulation below low-slope roof membranes. The information obtained by performing an NDE roof moisture survey is most often sought by building owners to help them decide whether:
 
  1. The existing roof system is a candidate for long-term repair efforts.
  2. To re-cover the existing system with additional insulation and a new roof membrane.
  3. To remove an existing low-slope roof system (i.e., themembrane and insulation) prior to replacing them with new insulation and a new membrane.
 
The decision of whether to remove or re-cover an existing roof is critical because of the significant cost differential between roof removal and replacement (tear-off) and roof recovery. Although re-covering an existing roof system is less costly, there is a risk that moisture trapped within the original system, especially in the insulation, will have a negative effect on the overall roof assembly. Moisture contained in the insulation of the original roof system that is re-covered often leads to corrosion of fasteners and steel roof decks and may cause spalling damage to concrete decks. Furthermore, trapped moisture can cause structural damage to other types of roof decks (e.g., wood, gypsum, cementitious wood fiber).