Metal Roof Installed Over Purlins

I have been playing around with the ribbed metal roof but pricing is pretty high over shingles obviously.

Metal roof installed over purlins.

It helps direct water away from the meeting points and keeps the roofing dry. Bend the flashing into a v shape to fit over the top roof ridge and the corners where the panels meet. Doesn t provide the flattest surface for the metal roofing to be installed over each course of shingles is about a 1 8 higher than the course just below it. 3 install 1 4 purlins down over the shingles before installing the metal roof the third way to install a metal roof over shingles is by applying 1 4 purlins over the shingle roof.

Purlins are 2 by 4 feet and are installed much like metal roofing. The flashing should overlap the edge of the roof by one inch to help direct water. Metal roofing panels rated for architectural use attached to purlins horizontal pieces of wood or metal fastened to roofing trusses are structurally sound when installed according to your roofing manufacturer s instructions and local building codes. Metal roof purlins are installed horizontally under metal roofs.

Choosing to install a metal roof this way can save you some dough and garner all of the benefits of a metal roof in the humid climate of florida. For many applications a layer of plywood underneath your metal roofing is an unnecessary expense. They give added support to the roof and also provide a nailing surface for the end panels and drip edge. A metal roof can be installed over a shingle roof but you ll need to make sure the plywood under your shingle roof is in good enough shape to handle a new metal roof over top.

They then installed the metal directly to that. The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to. Purlins are non pressure treated 1 x 4 x 12 lumber that is installed on to the roof in a specific layout pattern and screw pattern. The purlins are screwed or nailed down to the roof deck depending on how the metal roofing manufacture has testing for their roofing panels and then the metal is installed to the purlins.

The second way to install a metal roof over a shingle roof is with the use of purlins or battens.