The washer under the screw head should seal to the surface of the panel without bulging or shifting.
How to install galvanized steel corrugated roof panel.
Metal panels are made to overlap a few inches in the grooves.
Fasten it with galvanized screws with plastic washer caps by using a screw gun.
Start at the end of one wall and use square up.
Place the first screw about 7 inches from the bottom and each subsequent screw about 18 to 24 inches apart along the vertical run.
Secure the screws but do not overtighten.
This will keep the wall straight as you place additional panels.
Install a corrugated panels on gable roofs usually begins on one side of the roof working in the opposite direction of the prevailing wind.
By installing the first panel square the rest will follow suit.
Beginning at the outside edge of your roof place each panel directly onto the purlins that are attached to the roof trusses.
Next pre drill holes on the end and side ridges of the panels spacing the holes 6 to 8 inches apart.
When it comes to installing the metal screws be careful not to drive screws too deep.
To install corrugated roofing start by cutting your panels to length with an angle grinder.
Install the first galvanized roof panel at one bottom corner.
On hip roofs this crew prefers to begin at the center and work outward.