Determine the correct metal roofing substrate (solid deck vs. purlins/battens) and panel type for a residential metal reroof.

Steps

1. Confirm local code and manufacturer requirements for substrate: most residential exposed-fastener and standing-seam panels over conditioned living space require solid sheathing with an approved underlayment, while open purlin/batten framing is more typical on unconditioned structures where locally permitted.
2. Identify the panel type being installed (exposed-fastener screw-down panel vs. concealed-fastener standing seam), since attachment method and substrate requirements differ significantly between them.
3. Confirm the required underlayment (often a high-temperature synthetic or self-adhered membrane) between panel and deck, and confirm any ventilation/air-gap strategy required by the panel manufacturer.
4. Verify the panel product's applicable code listing/evaluation report for the specific application, fastening pattern, and wind uplift rating for the project's design wind speed.
5. Confirm local snow-load and thermal-movement (expansion/contraction) accommodations required by the manufacturer for the panel length being installed.