Commercial Roof Moisture Surveying
Why A Moisture Survey Is Step One – Before Any Contractor Gives You A Bid
Replacing a commercial roof is one of the largest capital expenditures a building owner will make. A full tear-off and replacement on a mid-sized commercial building can run well into six figures. A restoration coating (applying a waterproofing system over the existing membrane) can cost a fraction of that and add 10 to 20 years of life to the roof.
So the question is obvious: why would you replace a roof you could restore?
The answer is also obvious: because you can’t apply a restoration coating over wet insulation and expect it to hold. And without a moisture survey, you have no way to know how much of your insulation is wet.
The Decision Framework
Restoration Makes Sense When:
Replacement Is A Better Call When:
Here’s the problem: without a moisture survey, you can’t know which scenario you’re in. A contractor who quotes you a restoration without first conducting a moisture survey is guessing — and if they guess wrong and apply a coating over wet insulation, or try to overlay a single-ply membrane over that same insulation, then the roof system will fail, and manufacturer-backed warranties often become voidable once it becomes clear that this moisture was not properly addressed.
How Wet Insulation Affects Restoration Outcomes
Restoration coatings adhere to the existing roof surface, sometimes relying on the use of a primer for certain substrate types. For this to hold over time, the substrate needs to be stable, meaning the materials beneath it need to remain dimensionally stable as temperatures change. Wet insulation is not stable. As it absorbs and releases moisture with seasonal temperature swings, it expands and contracts, working against the coating from below. In addition to this, when water evaporates as it heats up, the resulting steam will follow the path of least resistance as the pressure builds up beneath the surface. The result is bubbling, delamination, and roof system failure.
This is not a theoretical risk. It’s one of the most common reasons restoration coatings or single-ply overlays fail prematurely. And, because it’s caused by a condition that predated the coating application, it is specifically excluded from most manufacturer warranties.
The Role of A Moisture Survey In The Restoration Process
While applying for warranties with manufacturers, many request (and sometimes require) a moisture survey to be conducted prior to installation. This pre-restoration moisture survey gives the following data:
A Note About Manufacturer Warranty Requirements
Most major commercial roofing system manufacturers, especially those whose products are used in fluid-applied restoration systems, request or require a moisture survey as part of the warranty application process for restoration work. The survey confirms that the substrate meets the conditions under which the warranty is valid. Without it, the warranty may be conditional, reduced, or denied outright.
Moisture Survey Pros reports have been accepted by manufacturers nationwide for warranty documentation purposes. We work regularly with roofing contractors who are submitting warranty applications and can deliver reports in the format your manufacturer requires.
Trusted Partners
At Moisture Survey Pros, we believe in building strong relationships with trusted professionals who share our commitment to quality and service. Our ‘Trusted Partners’ is a network that includes top contractors and businesses we confidently recommend to our clients. Whether you need expert roofing services, repairs, or additional building maintenance, these trusted partners uphold the same high standards we do, ensuring you receive reliable, efficient, and professional support every step of the way.
