To understand what causes condensation we reached out to chris davis president of dripstop.
Underside of metal roof.
The final method of stoppoing a metal roof sweating is to bond an anti condensation layer on to the underside of the roof.
Install the roofing screws vertically along each rib in the panel.
What causes condensation problems on the underside of metal roofs.
This occurs when water molecules get trapped underneath between the panel and the insulation or underlayment which can cause the metal to weaken if not coated.
Underside corrosion if the metal is improperly coated on the underside of the panel corrosion could take place.
Place the first screw.
Align the first metal roofing panel so that it overlaps the edging by 1 2 to 3 4 of an inch and is square to the roof.
When condensation starts to form on the underside of the roof it is absorbed by the fleece material.
Then as the temperature inside and outside equalise the moisture is released.
Be sure the larger edge is laid so that the small edge of the next panel will overlap it.