Manufacturers provide 30 year warranties on metal roofing products.
Furring strips on roof spacing.
If there are gaps around the roof penetration or valley points cut extra sections of furring to fit.
Some consideration for vent stacks and chimneys is required during the design process.
Establish an air space perfect for masonry insulation and cedar shingle projects.
Metal furring strips come in two different styles.
Hat channel furring strips are the most common kind of metal furring strips and are mainly used in the real estate industry due to its heat resistance qualities.
Create a level surface for attaching wallboard and paneling.
When finished there should be a row of furring strips stretching from one end to another with the top edge aligned at the peak.
These furring strips got their name due to the fact that they re shaped like a hat.
When re roofing a shingle roof with metal do not install the metal roofing directly on a shingle roof.
Edit answer for another 41 minute you need to check the installation instructions from the manufacturer depending on whether the purlins firring strips are 1x or 2x material and how wide thickness metal gage of roofing steel or aluminum type of seams design wind and snow loading whether designed to be walked on or not etc i have seen it vary from as little as 4 inches clear gap between firring strips on lightweight aluminum to as much as 4 feet on very heavy gage steel.
Installing steel roofing over existing roofing materials is fairly simple.
In most cases furring strips are 1 x 2 or 1 x 3 in size and can be applied both horizontally or vertically.
Every piece of 2 in.
Use furring strips to build a slat board on the roof then mount the steel sheets to the slat board.
Furring strip board is perfect for a wide range of uses including carpentry hobbies shelving and general finish work.
Always place fasteners in the flat of the metal roofing.
Correctly measure the spacing of furring strips for a metal roof to further decrease condensation.
Place it two feet apart from the first row.
Some manufacturers want to see firring strips commonly 1x3 or 1x4 running up and down the roof supporting the center of the flat part of the panels not uslaly called for under the ribs because you are not supposed to step there i have seen 1x2 or 1x3 s called out for at the third points of the flat part the web on wider panel roofing.