What are the conditions that will make condensation occur on the underside of an un-insulated metal roof deck or framing members?

Condensation will occur on any surface when the temperature of the surface is at or below the "dew-point temperature" for an air-water mixture. The dew-point temperature depends on the dry-bulb temperature (measured with an ordinary thermometer) and the relative humidity in the space next to the surface. The dew-point temperature is less than or equal to the dry-bulb temperature. The two temperatures are equal when the relative humidity is 100%. Some examples of dew-point temperature:

As you can see, condensation can occur when the outside temperature is cold. Insulation below a roof deck will have an inside surface temperature that is above the roof surface temperature. The actual temperature of the inside surface depends on the amount of thermal resistance between the roof and the inside surface. The higher the resistance, the closer the interior surface temperature will be to the inside air temperature. Maintaining a reasonable inside relative humidity (less than 60%) is an important factor in preventing condensation.

Product Reference: 

FSK Shield
Radiant Shield
RBI Shield
RetroShield® System

Market Reference: 

Single Family
Multi Family
Restaurants
High Rise
Light Commercial
General Agricultural
Poultry Houses
Schools
Community
Healthcare
Manufacturing
Power Plant
Storage
Municipal
Aircraft Hangars
Military
Gymnasiums

Professionals Reference: 

Builder
Insulation Contractor
Rater
Building Owner
Remodeler
Engineer
Homeowner
Architect

Product Applications Reference: 

Roofs
Roofs
Roofs
Roofs
Roofs

Building Type Reference: 

Metal

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