Metal Roof Installation
Q: I have some 26 gauge green metal. I want to use it to re-roof my home. I want to install 2×4’s every 2 ft on top of the 3 tab comp singles, and install the metal roof to the 2×4. Do I need some kind of rigid board insulation or radiant barrier? Also, do I need to put down tar paper on top of the comp roof?
A: I would put down underlayment, yes.
Radiant barrier is up to you. A radiant barrier facing the airspace could help with energy efficiency.
You may want to consider vertical battens and then horizontal ones, and then ventilate the resulting chamber.
Assuming you have a vented attic, if you want to add insulation, do it on top of your ceilings not up on the roof at this point.
Make sure that the panels you are installing are okay to be installed over battens.
Todd Miller has spent his entire career in the metal building products manufacturing industry. He is president of Isaiah Industries, an organization recognized as one of the world’s leading metal roofing manufacturers. Todd is currently Vice President of the MRA (Metal Roofing Association) and a Past Chair of MCA (Metal Construction Association). Through his website, he strives to raise the bar on standards and practices to provide property owners with the best possible products for successful roofing projects.
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