Codes vary, so call your local building department to know how to install metal roofing over ... badly curled or the roof ridge is bowed. Finally, the frame creates a ventilation gap that helps ...

The built-in extension can be seamlessly connected to flexible or metal ducts and is compatible ... 【Widespread Application】Suitable as a ventilation system for home roofs, this Roof vent ...

There's always moisture in the air, even on days without rain. A roof that's not built for that will fail faster and invite probl ...