Predrill a pilot hole for the screws with an 1 8 masonry bit.
Attaching hose bib to metal siding.
Clean the dust off the siding caulk around the perimeter of the hole then slide your hose bib in and use two 2 stainless steel screws to hold it on.
Apply silicone caulk around the hole and attach the hose bib by driving two deck screws that are coated to resist rusting.
Personally i would not use a latex caulking on fiber cement.
My main tool for perfection.
The easiest and safest way to hang something from vinyl siding is to use a siding hook.
Press your bit into the siding that covers the outside of the house just far enough that it makes a hole with the centering part of the paddle bit.
Twist the connector on the reel s short hose to the hose bib and fasten the end of the garden hose to.
It slips into the groove between adjoining slats and once it clicks into place you can hang items as heavy as 12 pounds.
This video shows a unique and ez way to mark and cut out an electrical box hole in metal siding.
Drive the appropriate screws through the screw holes and into the wall until they are snug.
From the outside slip on the plastic gasket and push the hose bib through the hole.