When it comes to installing the metal screws be careful not to drive screws too deep.
How to install galvanized steel corrugated roof panel.
Install the first galvanized roof panel at one bottom corner.
Fasten it with galvanized screws with plastic washer caps by using a screw gun.
This will keep the wall straight as you place additional panels.
Side laps should still face away from the wind.
Install the roofing screws vertically along each rib in the panel.
Next pre drill holes on the end and side ridges of the panels spacing the holes 6 to 8 inches apart.
Secure the screws but do not overtighten.
Metal panels are made to overlap a few inches in the grooves.
Place the first screw about 7 inches from the bottom and each subsequent screw about 18 to 24 inches apart along the vertical run.
The washer under the screw head should seal to the surface of the panel without bulging or shifting.
Beginning at the outside edge of your roof place each panel directly onto the purlins that are attached to the roof trusses.
Place the first screw at the outside bottom edge add screws at the other edge and the top of the panel to secure it and finish fastening it with screws about 24 inches apart.
By installing the first panel square the rest will follow suit.
Start at the end of one wall and use square up.