Pre-Installation Inspections 

This type of inspection is conducted to assure a new roof system scheduled for installation is being installed over an acceptable substrate.  Substrate acceptability is a requirement of all roofing system manufacturer’s warranty requirements.   

Many roofing systems can be installed over one existing roof.  However, the condition of any existing system must meet minimum standards so as not to damage the newly installed roof or continue to deteriorate the underlying roof deck. 

A number of factors are in need of evaluation including: 

* Compatibility of the roofing systems 

* Condition of the roof deck 

* Presence of underlying moisture in the existing roofing system 

* Adhesion of the existing roofing system to the deck 

* Drainage of the existing roof and provisions for positive drainage of the proposed new roof. 

Installation of a new roofing system over an unacceptable substrate can immediately invalidate a new roof system warranty.   

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