The purpose of the spacing is related to the drip edge.
Roofing screws too long for metal roof.
Generally it is best to place each roofing screw about one and half to two feet apart but no more than that.
Designed to fasten multiple layers of metal roof panels metal siding panels attach trim to metal building sheets or seal lap joints of metal building sheets.
Extending the panel too long over the edge.
Screws may not be able to grip the underlying material enough to properly hold the metal roof down.
Let the panel overhang by about an inch and a half to 2 inches.
In some homes this means using 1 inch screws to get the appropriate distances.
Some roofers make the mistake of letting the metal panels extend too much or too little over the roof s edge.
Pipe flashing covered by too few screws.
9 10 12 and procap metal to wood screws are 1 4 hex head screws 12 14 and proz metal fasteners are 5 16 hex head screws.
Screws will not grip well on a rotted wood surface.
If water has seeped under the roof material the underlying material may become damaged.
Due to its lack of expansion and contraction these fasteners get wallowed out until they re too big for the screws that hold the metal panels down.
Proper tools not only is it crucial to have proper metal roofing screws but using a proper screw gun such as one powered by an air compressor will ensure safety as well as a strong finished look.
Water damage to underlying material.