What Causes Condensation Under A Metal Roof?

What Causes Condensation Under A Metal Roof?

What Causes Condensation Under A Metal Roof?

Condensation occurs when warm, wet air collides with a cold surface. It occurs in the case of metal roofs when warm, wet air from within the home is forced into and trapped within the hollow beneath the roof.

When the temperature of the metal roof lowers at night, air condenses on the underside of the roof. It is important to note that a layer of ice can form if water is present. This can be extremely dangerous, making roofs slippery and susceptible to shearing winds.

Efforts should be made to increase ventilation and remove moisture from the ceiling of a home. Ceiling fans placed in strategic locations are an excellent way to do this.

Another effective (but drastic) method is placing vent pipes in the roof above the garage of a home with a high ceiling and little available ventilation.

What Causes Oil-Canning Metal Roofs?

This occurs when the home or building on a metal roof or wall system is installed on changes, moves, or experiences something that makes it different from its original form. Oil canning can happen if there is enough of a change that it puts tension or stress on the metal panels.

What Causes Screws To Back Out Of A Metal Roof?

Through-fasteners might loosen or back out over time due to thermal expansion and contraction of the metal roofing and perhaps the movement of the substrate.

Metal roofing with loose or missing fasteners will have less wind resistance and may allow moisture in. It is important to ensure that the fasteners are always in their proper places.

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