This is non-negotiable. The (flat metal) goes along the eaves overhanging the drip edge by 1/2". Nail it every 6-8". This gives the first panel’s bottom lock something to grab.
However, the performance of a metal roof is dictated not just by the gauge of the steel, but by the precision of its installation. Below is a comprehensive overview of the EDCO Arrowline installation process, highlighting the critical steps that ensure a lifetime of protection. edco arrowline metal roofing installation
The DIYer’s Guide to EDCO ArrowLine Metal Roofing: Installation Tips & Tricks This is non-negotiable
Verify that the roof deck is free of warping and that all sheathing is securely fastened. edco arrowline metal roofing installation